Treatment method, test method and device for improving stability of retained austenite of bearing

Abstract

The invention relates to the technical field of bearings, in particular to a treatment method, a test method and a device for improving the stability of retained austenite of a bearing, and the treatment method comprises the following steps: fixing a target bearing steel roller in a cavity of pulsed magnetic field treatment equipment; acquiring pulsed magnetic field processing parameters, inputting the pulsed magnetic field processing parameters into pulsed magnetic field processing equipment, and generating a pulsed magnetic field by the pulsed magnetic field processing equipment based on the pulsed magnetic field processing parameters; a target bearing steel roller is treated in a pulsed magnetic field, the pulsed magnetic field promotes depolymerization of Korotkoff gas mass in a target bearing steel roller material, so that carbon atoms segregated in the Korotkoff gas mass migrate to retained austenite, the carbon content in the austenite is increased, and then the austenite is stabilized. Therefore, the problem that the service life of the bearing is affected due to the fact that the problem of size instability caused by retained austenite phase change in the service process of the finished bearing cannot be solved in the prior art is solved.

Description

Technical Field

[0001] This application relates to the technical field of bearings, and particularly to a treatment method, a testing method, and a device for improving the stability of retained austenite in bearings. Background Art

[0002] Cr4Mo4V bearing steel is widely used in the manufacture of main shaft bearings for aeroengines. The unstable retained austenite during its service will cause volume expansion and deformation due to phase transformation, thus affecting the dimensional accuracy and service life of the bearings.

[0003] Cr4Mo4V bearing steel is a high-strength steel with tempered martensite as the matrix and dispersed carbides for strengthening. One of the important phases is retained austenite, which is itself an unstable phase. In the actual operating environment of high temperature and high load, an appropriate amount of stable retained austenite can coordinate the deformation during crack propagation, relieve stress concentration, and effectively improve the fatigue life of the bearings. However, too much retained austenite will transform into more stable martensite, and the occurrence of phase transformation will cause a decrease in the dimensional stability of the bearings.

[0004] In related technologies, measures for stabilizing retained austenite include metallurgical control, heat treatment, cryogenic treatment, pre-deformation and other means. At present, related methods have been applied, but it is difficult to further improve the stability of austenite, and the above methods are mainly applied in the manufacturing process and cannot be directly applied to finished bearings. For finished bearings, there is still a problem of dimensional instability caused by retained austenite phase transformation, which in turn affects the service life of the bearings. Summary of the Invention

[0005] This application provides a treatment method, a testing method, and a device for improving the stability of retained austenite in bearings to solve the problem that the related technologies cannot solve the problem of dimensional instability caused by retained austenite phase transformation in finished bearings, which in turn affects the service life of the bearings.

[0006] In the first aspect of the embodiments of this application, a treatment method for improving the stability of retained austenite in bearings is provided, including the following steps: fixing a target bearing steel roller in the cavity of a pulsed magnetic field treatment device; obtaining pulsed magnetic field treatment parameters and inputting the pulsed magnetic field treatment parameters into the pulsed magnetic field treatment device, and the pulsed magnetic field treatment device generates a pulsed magnetic field based on the pulsed magnetic field treatment parameters; treating the target bearing steel roller in the pulsed magnetic field, wherein the pulsed magnetic field promotes the depolymerization of Cottrell atmospheres in the material of the target bearing steel roller, so that the carbon atoms segregated in the Cottrell atmospheres migrate to the retained austenite.

[0007] Optionally, the pulsed magnetic field treatment parameters include at least one of the pulsed magnetic field intensity and the number of pulsed magnetic field treatments.

[0008] The second aspect of the present application provides a method for testing the stability of retained austenite in bearings, including the following steps: Select a plurality of target bearing steel rollers, and obtain the retained austenite content information of the plurality of target bearing steel rollers; Use the treatment method for improving the stability of retained austenite in the first aspect to treat some of the plurality of target bearing steel rollers; Conduct the same amount of compression performance tests on the untreated target bearing steel rollers and the treated target bearing steel rollers simultaneously, and obtain the retained austenite content information of the untreated target bearing steel rollers and the treated target bearing steel rollers after the compression performance tests; Determine the stability test result of the treated target bearing steel rollers according to the retained austenite content information before and after the compression performance test.

[0009] Optionally, the process for obtaining the retained austenite content information includes: Conduct a magnetic property test on the target bearing steel rollers to obtain the saturation magnetization intensity data; Use the relationship between the retained austenite content and the magnetization intensity, and the saturation magnetization intensity data, to calculate the retained austenite content information of the target bearing steel rollers.

[0010] Optionally, the relationship between the retained austenite content and the magnetization intensity is:

[0011]

[0012] where, M martensite is the magnetization intensity of pure martensite; M sample is the saturation magnetization intensity data.

[0013] Optionally, determining the stability test result of the treated target bearing steel rollers according to the retained austenite content information before and after the compression performance test includes: Calculate the mechanical stability coefficient of the retained austenite of the untreated target bearing steel rollers according to the retained austenite content information before and after the compression performance test of the untreated target bearing steel rollers; Calculate the mechanical stability coefficient of the retained austenite of the treated target bearing steel rollers according to the retained austenite content information before and after the compression performance test of the treated target bearing steel rollers; Determine the stability test result of the treated target bearing steel rollers according to the mechanical stability coefficients of the retained austenite of the untreated target bearing steel rollers and the treated target bearing steel rollers respectively.

[0014] Optionally, the calculation formula for the mechanical stability coefficient of the retained austenite is:

[0015] f RAε = f RA0 exp(-Kε)

[0016] where, f RA0 is the retained austenite content information before compression; f RAεis the retained austenite content information after compression, ε is the true strain, and K is the mechanical stability coefficient of retained austenite.

[0017] An embodiment of the third aspect of the present application provides a processing device for improving the stability of retained austenite in bearings, including: a fixing module for fixing a target bearing steel roller in the cavity of a pulsed magnetic field processing device; a generating module for obtaining pulsed magnetic field processing parameters and inputting the pulsed magnetic field processing parameters into the pulsed magnetic field processing device, and the pulsed magnetic field processing device generates a pulsed magnetic field based on the pulsed magnetic field processing parameters; a first processing module for processing the target bearing steel roller in the pulsed magnetic field, wherein the pulsed magnetic field promotes the depolymerization of Cottrell atmospheres in the material of the target bearing steel roller, causing carbon atoms segregated in the Cottrell atmospheres to migrate to the retained austenite.

[0018] An embodiment of the fourth aspect of the present application provides a testing device for the stability of retained austenite in bearings, including: a selection module for selecting a plurality of target bearing steel rollers and obtaining the retained austenite content information of the plurality of target bearing steel rollers; a second processing module for using the method for improving the stability of retained austenite in bearings according to any one of claims 1 or 2 to process some of the plurality of target bearing steel rollers; a testing module for simultaneously performing an equal amount of compression performance tests on the untreated target bearing steel rollers and the processed target bearing steel rollers, and obtaining the retained austenite content information after the compression performance tests of the untreated target bearing steel rollers and the processed target bearing steel rollers; a determination module for determining the stability test result of the processed target bearing steel rollers according to the retained austenite content information before and after the compression performance test.

[0019] An embodiment of the fifth aspect of the present application provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor executes the program to implement the method for improving the stability of retained austenite in bearings in the first aspect, or the method for testing the stability of retained austenite in bearings in the second aspect.

[0020] Therefore, the present application has the following beneficial effects:

[0021] In the embodiment of the present application, the target bearing steel roller is fixed in the cavity of the pulsed magnetic field processing equipment to obtain the pulsed magnetic field processing parameters. The pulsed magnetic field processing parameters are input into the pulsed magnetic field processing equipment, and a pulsed magnetic field is generated based on the pulsed magnetic field processing parameters. The target bearing steel roller is processed in the pulsed magnetic field to promote the depolymerization of the Cottrell atmosphere in the material of the target bearing steel roller, so that the carbon atoms segregated in the Cottrell atmosphere migrate to the retained austenite, thereby increasing the carbon content of the austenite, increasing the retained austenite structure and mechanical stability, and can be directly applied to finished bearings. Thus, the problem that the related art cannot solve the dimensional instability problem caused by the retained austenite phase transformation of the finished bearing, and further affecting the service life of the bearing is solved.

[0022] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 FIG. is a schematic flow chart of a processing method for improving the stability of retained austenite in bearings according to an embodiment of the present application;

[0025] Figure 2 FIG. is a schematic flow chart of a test method for the stability of retained austenite in bearings according to an embodiment of the present application;

[0026] Figure 3 FIG. is a schematic diagram of the change in the saturation magnetization intensity of the control group and the processed sample compressed to 2.5% engineering strain according to an embodiment of the present application;

[0027] Figure 4 FIG. is a schematic diagram of the change in the retained austenite content of the control group and the processed sample compressed to 2.5% engineering strain according to an embodiment of the present application;

[0028] Figure 5 FIG. is a schematic block diagram of a processing device for improving the stability of retained austenite in bearings according to an embodiment of the present application;

[0029] Figure 6 FIG. is a schematic block diagram of a test device for the stability of retained austenite in bearings according to an embodiment of the present application;

[0030] Figure 7 FIG. is a schematic structural diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals designate like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0032] The processing method, testing method, and device for improving the stability of retained austenite in bearings according to embodiments of the present application will be described below with reference to the accompanying drawings. In view of the problem in the related art mentioned in the above background art that the phase transformation of retained austenite in finished bearings cannot be solved, which further affects the service life of the bearings, the present application provides a processing method for improving the stability of retained austenite in bearings. In this method, the target bearing steel rollers are fixed in the cavity of the pulsed magnetic field processing equipment to obtain the pulsed magnetic field processing parameters, and the pulsed magnetic field processing parameters are input into the pulsed magnetic field processing equipment. Based on the pulsed magnetic field processing parameters, a pulsed magnetic field is generated, and the target bearing steel rollers are processed in the pulsed magnetic field to promote the depolymerization of Cottrell atmospheres in the target bearing steel roller material, so that the carbon atoms segregated in the Cottrell atmospheres migrate to the retained austenite, thereby increasing the carbon content of the austenite and enhancing the retained austenite structure and mechanical stability. It can be directly applied to finished bearings. Thus, the problem in the related art that the phase transformation of retained austenite in finished bearings cannot be solved, which further affects the service life of the bearings, is solved.

[0033] Specifically, Figure 1 FIG. is a schematic flow chart of a processing method for improving the stability of retained austenite provided by an embodiment of the present application.

[0034] As Figure 1 shown, the processing method for improving the stability of retained austenite in bearings includes the following steps:

[0035] In step S101, the target bearing steel rollers are fixed in the cavity of the pulsed magnetic field processing equipment.

[0036] Among them, fixing the target bearing steel rollers in the cavity of the pulsed magnetic field processing equipment is to facilitate subsequent specific processing, such as magnetic processing, to improve the material properties of the target bearing steel rollers.

[0037] In step S102, the pulsed magnetic field processing parameters are obtained, and the pulsed magnetic field processing parameters are input into the pulsed magnetic field processing equipment. The pulsed magnetic field processing equipment generates a pulsed magnetic field based on the pulsed magnetic field processing parameters.

[0038] It can be understood that after receiving the pulsed magnetic field processing parameters, the pulsed magnetic field processing equipment in the embodiment of the present application will generate a corresponding pulsed magnetic field according to the requirements of the pulsed magnetic field processing parameters to improve the material properties of the target bearing steel rollers.

[0039] In the embodiments of the present application, the pulsed magnetic field treatment parameters include at least one of the pulsed magnetic field intensity and the number of pulsed magnetic field treatments.

[0040] It can be understood that the pulsed magnetic field treatment parameters in the embodiments of the present application include the pulsed magnetic field intensity, the number of pulsed magnetic field treatments, etc. For example, in the pulsed magnetic field treatment parameters, the pulsed magnetic field intensity is set to 2 - 3 T, and the number of pulsed magnetic field treatments is 50 - 90 times. Then the pulsed magnetic field treatment equipment performs pulsed magnetic field treatment according to these parameters.

[0041] In step S103, the target bearing steel roller is treated in a pulsed magnetic field. Among them, the pulsed magnetic field promotes the depolymerization of Cottrell atmospheres in the material of the target bearing steel roller, causing the carbon atoms segregated in the Cottrell atmospheres to migrate to the retained austenite, increasing the carbon content of the austenite and stabilizing the austenite.

[0042] Among them, the Cottrell atmosphere refers to a phenomenon in which carbon atoms or other interstitial atoms segregate around dislocations in metallic materials, especially in steel after cold working or quenching treatment; depolymerization refers to the phenomenon that through external conditions, the carbon atoms originally concentrated around dislocations are released from the Cottrell atmospheres and leave their original aggregation positions; austenite is a phase with a face-centered cubic crystal structure, which can be retained to room temperature under certain conditions to form so-called retained austenite.

[0043] It can be understood that through the pulsed magnetic field treatment in the embodiments of the present application, the Cottrell atmospheres inside the target bearing steel roller are depolymerized under the influence of the pulsed magnetic field, causing the carbon atoms originally aggregated around the dislocations to be released from these atmospheres and migrate to the retained austenite. By this treatment method, the internal microstructure and carbon atom distribution of the material are changed, the carbon content of the austenite is increased, and the austenite is stabilized to optimize the performance of the bearing steel roller.

[0044] According to the treatment method for improving the stability of retained austenite in the bearings proposed in the embodiments of the present application, by fixing the target bearing steel roller in the cavity of the pulsed magnetic field treatment equipment, obtaining the pulsed magnetic field treatment parameters, inputting the pulsed magnetic field treatment parameters into the pulsed magnetic field treatment equipment, generating a pulsed magnetic field based on the pulsed magnetic field treatment parameters, treating the target bearing steel roller in the pulsed magnetic field, promoting the depolymerization of Cottrell atmospheres in the material of the target bearing steel roller, causing the carbon atoms segregated in the Cottrell atmospheres to migrate to the retained austenite, thereby increasing the carbon content of the austenite, increasing the retained austenite structure and mechanical stability, and it can be directly applied to finished bearings.

[0045] Secondly, a method for testing the stability of retained austenite in bearings proposed according to the embodiments of the present application is described with reference to the accompanying drawings. Figure 2 It is a schematic flow chart of the method for testing the stability of retained austenite in bearings in the embodiments of the present application.

[0046] As Figure 2 shown, the test method for the stability of retained austenite in the bearing includes the following steps:

[0047] In step S201, select a plurality of target bearing steel rollers and obtain the retained austenite content information of the plurality of target bearing steel rollers.

[0048] Among them, the target bearing steel roller refers to the roller component made of bearing steel to be processed and analyzed; the retained austenite content refers to the proportion of retained austenite in a given volume or weight of the material.

[0049] It can be understood that in the embodiment of the present application, first, a plurality of target bearing steel rollers are selected, and the content information of the retained austenite in the target bearing steel rollers is detected. The method for detecting the content of the retained austenite is as follows:

[0050] In the embodiment of the present application, the process for obtaining the retained austenite content information includes: performing a magnetic property test on the target bearing steel rollers to obtain the saturation magnetization intensity data; calculating the retained austenite content information of the target bearing steel rollers by using the relationship between the retained austenite content and the magnetization intensity and the saturation magnetization intensity data.

[0051] Among them, the magnetic property test is a method for evaluating the magnetic properties of a material by applying an external magnetic field and measuring the response of the material; the saturation magnetization intensity refers to the maximum magnetization intensity that the material can reach when the external magnetic field is gradually increased until all magnetic domains inside the material are aligned along the magnetic field direction.

[0052] It can be understood that in the embodiment of the present application, a magnetic property test is performed on the selected rollers to obtain their saturation magnetization intensity data. Then, by using the known relationship between the retained austenite content and the magnetization intensity and combining the measured saturation magnetization intensity data, the specific content of the retained austenite in the target bearing steel rollers is calculated.

[0053] In the embodiment of the present application, the relationship between the retained austenite content and the magnetization intensity is:

[0054]

[0055] where M martensite is the magnetization intensity of pure martensite, which refers to the magnetization intensity when the material is completely composed of martensite and does not contain any non-magnetic phases, such as retained austenite; M sample is the measured saturation magnetization intensity data.

[0056] In step S202, use the above-mentioned treatment method for improving the stability of retained austenite in the bearing to treat some of the plurality of target bearing steel rollers.

[0057] It can be understood that in the embodiments of the present application, some of the target bearing steel rollers that need to be processed are selected from multiple target bearing steel rollers. Through the above-mentioned method for enhancing the stability of retained austenite in bearings, the target bearing steel rollers are fixed in the cavity of the pulsed magnetic field processing equipment, the pulsed magnetic field processing parameters are obtained, the pulsed magnetic field processing parameters are input into the pulsed magnetic field processing equipment, a pulsed magnetic field is generated based on the pulsed magnetic field processing parameters, and the target bearing steel rollers are processed in the pulsed magnetic field to promote the depolymerization of Cottrell atmospheres in the target bearing steel roller material, enabling the carbon atoms segregated in the Cottrell atmospheres to migrate to the retained austenite, increasing the carbon content in the austenite, and obtaining the processed target bearing steel rollers.

[0058] In step S203, the unprocessed target bearing steel rollers and the processed target bearing steel rollers are simultaneously subjected to the same amount of compressive property tests to obtain the retained austenite content information after the compressive property tests of the unprocessed target bearing steel rollers and the processed target bearing steel rollers.

[0059] Among them, the compressive property test is a method for evaluating the mechanical properties such as the compressive strength and deformation behavior of materials by applying a gradually increasing compressive force.

[0060] It can be understood that in the embodiments of the present application, the unprocessed target bearing steel rollers and the target bearing steel rollers with enhanced retained austenite stability after processing are simultaneously subjected to compressive property tests under the same conditions, and the retained austenite content information of these two groups of rollers is respectively obtained after the tests. Specifically, first, the unprocessed target bearing steel rollers and the processed target bearing steel rollers are subjected to the same compressive property test under the same conditions, and the results are recorded, and then the retained austenite content of each group of rollers after the compressive property test is measured.

[0061] In step S204, based on the retained austenite content information before and after the compressive property test, the stability test result of the processed target bearing steel rollers is determined.

[0062] Among them, the stability test result of the processed target bearing steel rollers can be determined by the following method:

[0063] In the embodiment of the present application, the stability test result of the processed target bearing steel roller is determined according to the retained austenite content information before and after the compression performance test, including: calculating the retained austenite mechanical stability coefficient of the unprocessed target bearing steel roller according to the retained austenite content information before and after the compression performance test of the unprocessed target bearing steel roller; calculating the retained austenite mechanical stability coefficient of the processed target bearing steel roller according to the retained austenite content information before and after the compression performance test of the processed target bearing steel roller; and determining the stability test result of the processed target bearing steel roller according to the retained austenite mechanical stability coefficients of the unprocessed target bearing steel roller and the processed target bearing steel roller respectively.

[0064] Among them, the retained austenite mechanical stability coefficient is used to quantify the degree of change in the retained austenite content of the material before and after treatment. The lower the retained austenite mechanical stability coefficient, the more stable the retained austenite in the material is under external force and the less likely it is to undergo a phase change.

[0065] It can be understood that in the embodiment of the present application, a compression performance test is carried out on the unprocessed target bearing steel roller, and the retained austenite content information before and after the test is recorded. Based on these data, the retained austenite mechanical stability coefficient of the unprocessed target bearing steel roller is calculated. Similarly, the same steps are repeated for the processed target bearing steel roller to calculate the retained austenite mechanical stability coefficient of the processed target bearing steel roller. Then, by comparing the retained austenite mechanical stability coefficients of the unprocessed and processed target bearing steel rollers respectively, it is determined whether the treatment method effectively improves the stability of the retained austenite in the roller. If the processed target bearing steel roller shows a lower retained austenite mechanical stability coefficient, it indicates that the treatment has successfully enhanced the stability of the retained austenite, thus verifying the effectiveness of the treatment technology.

[0066] In the embodiment of the present application, the calculation formula of the retained austenite mechanical stability coefficient is:

[0067] f RAε =f RA0 exp(-Kε)

[0068] Among them, f RA0 is the retained austenite content information before compression; f RAε is the retained austenite content information after compression, ε is the true strain, and K is the retained austenite mechanical stability coefficient.

[0069] According to the testing method for the stability of retained austenite in bearings proposed in the embodiments of the present application, by selecting a plurality of target bearing steel rollers, obtaining the information on the retained austenite content of the plurality of target bearing steel rollers, using the treatment method for enhancing the stability of retained austenite in bearings to treat some of the target bearing steel rollers among the plurality of target bearing steel rollers, then, conducting an equal amount of compression performance tests on the untreated target bearing steel rollers and the treated target bearing steel rollers simultaneously, and determining the stability test result of the treated target bearing steel rollers based on the information on the retained austenite content before and after the compression performance test. If the treated target bearing steel rollers show a lower mechanical stability coefficient of retained austenite, it indicates that the treatment has successfully enhanced the stability of retained austenite, thereby verifying the effectiveness of the treatment technology.

[0070] The treatment method for enhancing the stability of retained austenite in bearings and the testing method for the stability of retained austenite in bearings will be further described below through a specific embodiment.

[0071] This embodiment provides a method for improving the stability of retained austenite in bearing steel by using a pulsed magnetic field. The specific steps are as follows:

[0072] Step S1: Select finished product target bearing steel rollers;

[0073] Step S2: Conduct a magnetic property test on the target bearing steel rollers to obtain the saturation magnetization intensity data of the initial target bearing steel roller samples, and calculate the retained austenite content of the target bearing steel rollers based on the relationship between retained austenite and sample magnetization intensity, as the retained austenite content information of the initial target bearing steel rollers (the initial retained austenite data before compression).

[0074] Step S3: Fix the target bearing steel rollers in the cavity of the pulsed magnetic field treatment equipment, input the pulsed magnetic field treatment parameters, the parameters: pulsed magnetic field intensity 2 - 3T, pulsed magnetic field treatment times 50 - 90 times, and conduct pulsed magnetic field treatment.

[0075] Step S4: Conduct a room temperature compression performance test on the untreated target bearing steel rollers and the treated bearing rollers on a universal testing machine. The sample compression rate is 0.005 mm / min before yield to obtain the sample compression strength, and compress the pulsed magnetic field treated target bearing steel rollers and the untreated target bearing steel rollers by an equal amount of engineering strain simultaneously.

[0076] Step S5: Magnetic property tests are respectively carried out on the target bearing steel rollers after being processed by the compressed pulsed magnetic field and the unprocessed target bearing steel rollers to obtain the saturation magnetization intensity data of the target bearing steel rollers after being processed by compression and the unprocessed target bearing steel rollers. Similarly, according to the relationship between retained austenite and sample magnetization intensity, the retained austenite content of the target bearing steel rollers after being processed by compression and the unprocessed target bearing steel rollers is respectively calculated.

[0077] Step S6: Compare the change in the retained austenite content of the target bearing steel rollers after being processed before and after compression with that of the unprocessed target bearing steel rollers, and evaluate whether there is a large transformation in the retained austenite of the bearing under the action of a certain force and the improvement degree of its stability.

[0078] According to the above method, finished Cr4Mo4V bearing rollers are used, and the processing technology is as follows: the pulsed magnetic field strength is 2.4 T, and the number of processing times is 76 times. Room temperature compression performance tests are carried out on the unprocessed (as a control group) and processed bearing rollers. After the unprocessed and processed samples are compressed to the same strain (2.5%), the change in the saturation magnetization intensity of the samples is as Figure 3 shown. It can be seen from Figure 3 that the saturation magnetization intensity of the unprocessed sample after compression increases from 186.5 emu / g before compression to 189.2 emu / g, while the saturation magnetization intensity of the processed sample is 187.2 emu / g. For tempered Cr4Mo4V bearing steel, the microstructure includes tempered martensite + a very small amount of retained austenite + carbides, etc. Compression will trigger the phase transformation of paramagnetic austenite to ferromagnetic martensite, thereby increasing the saturation magnetization intensity. According to formula (1), the retained austenite content of the two samples before and after compression is calculated as Figure 4 shown. The retained austenite content of the unprocessed sample decreases from 4.68% to 3.31%, while the retained austenite content of the pulsed magnetic field processed sample is 4.32%. The following formula is for the retained austenite content f RA and the relationship with the sample magnetization intensity M sample :

[0079]

[0080] In the formula, M martensite is the magnetization intensity of pure martensite.

[0081] Use formula (2) to evaluate the effect of magnetic field treatment on the stability of retained austenite:

[0082] f RAε = f RA0 exp(-Kε) (2)

[0083] where f RA0 and f RAεThey are the retained austenite contents before and after compression respectively, ε is the true strain, and K is the mechanical stability coefficient of retained austenite. The lower it is, the more stable the retained austenite is. The samples were all compressed to an engineering strain of 2.5%, and the equivalent true strain was ε = 2.47%. It was calculated that under the action of the pulsed magnetic field, the mechanical stability coefficient K of the retained austenite decreased from 14 to 3.2, and the mechanical stability of the retained austenite increased by 3.4 times.

[0084] The processing device for improving the stability of retained austenite in bearings according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0085] Figure 5 It is a block diagram of the processing device for improving the stability of retained austenite in bearings according to an embodiment of the present application.

[0086] As Figure 5 shown, the processing device 10 for improving the stability of retained austenite in bearings includes: a fixing module 301, a generating module 302, and a first processing module 303.

[0087] Among them, the fixing module 301 is used to fix the target bearing steel roller in the cavity of the pulsed magnetic field processing equipment; the generating module 302 is used to obtain the pulsed magnetic field processing parameters and input the pulsed magnetic field processing parameters into the pulsed magnetic field processing equipment, and the pulsed magnetic field processing equipment generates a pulsed magnetic field based on the pulsed magnetic field processing parameters; the first processing module 303 is used to process the target bearing steel roller in the pulsed magnetic field. Among them, the pulsed magnetic field promotes the depolymerization of Cottrell atmospheres in the material of the target bearing steel roller, so that the carbon atoms segregated in the Cottrell atmospheres migrate to the retained austenite, increasing the carbon content of the austenite.

[0088] In an embodiment of the present application, the pulsed magnetic field processing parameters include at least one of the pulsed magnetic field intensity and the number of pulsed magnetic field processing times.

[0089] It should be noted that the foregoing explanations of the embodiments of the processing method for improving the stability of retained austenite in bearings also apply to the processing device for improving the stability of retained austenite in bearings in this embodiment, and will not be elaborated here.

[0090] The processing device for improving the stability of retained austenite in bearings according to an embodiment of the present application fixes the target bearing steel roller in the cavity of the pulsed magnetic field processing equipment, obtains the pulsed magnetic field processing parameters, inputs the pulsed magnetic field processing parameters into the pulsed magnetic field processing equipment, generates a pulsed magnetic field based on the pulsed magnetic field processing parameters, processes the target bearing steel roller in the pulsed magnetic field, promotes the depolymerization of Cottrell atmospheres in the material of the target bearing steel roller, so that the carbon atoms segregated in the Cottrell atmospheres migrate to the retained austenite, thereby increasing the carbon content of the austenite, increasing the retained austenite structure and mechanical stability, and can be directly applied to finished bearings.

[0091] Figure 6 It is a block diagram of a processing device for improving the stability of retained austenite in bearings according to an embodiment of the present application.

[0092] As Figure 6 shown, the test device 20 for the stability of retained austenite in bearings includes: a selection module 401, a second processing module 402, a test module 403, and a determination module 404.

[0093] Among them, the selection module 401 is used to select multiple target bearing steel rollers and obtain the retained austenite content information of the multiple target bearing steel rollers; the second processing module 402 is used to process some of the target bearing steel rollers among the multiple target bearing steel rollers by using a processing method for improving the stability of retained austenite in bearings; the test module 403 is used to simultaneously perform an equal amount of compression performance tests on the untreated target bearing steel rollers and the processed target bearing steel rollers, and obtain the retained austenite content information of the untreated target bearing steel rollers and the processed target bearing steel rollers after the compression performance test; the determination module 404 is used to determine the stability test result of the processed target bearing steel rollers according to the retained austenite content information before and after the compression performance test.

[0094] In an embodiment of the present application, the selection module 401 is further used for: in the process of obtaining the retained austenite content information, performing a magnetic property test on the target bearing steel rollers to obtain saturation magnetization intensity data; and calculating the retained austenite content information of the target bearing steel rollers by using the relationship between the retained austenite content and the magnetization intensity and the saturation magnetization intensity data.

[0095] In an embodiment of the present application, the relationship between the retained austenite content and the magnetization intensity is:

[0096]

[0097] where M martensite is the magnetization intensity of pure martensite; M sample is the saturation magnetization intensity data.

[0098] In an embodiment of the present application, the determination module 404 is further used for: determining the stability test result of the processed target bearing steel rollers according to the retained austenite content information before and after the compression performance test, calculating the retained austenite mechanical stability coefficient of the untreated target bearing steel rollers according to the retained austenite content information before and after the compression performance test of the untreated target bearing steel rollers; calculating the retained austenite mechanical stability coefficient of the processed target bearing steel rollers according to the retained austenite content information before and after the compression performance test of the processed target bearing steel rollers; and determining the stability test result of the processed target bearing steel rollers according to the respective retained austenite mechanical stability coefficients of the untreated target bearing steel rollers and the processed target bearing steel rollers.

[0099] In the embodiments of the present application, the calculation formula of the mechanical stability coefficient of retained austenite is:

[0100] f RAε = f RA0 exp(-Kε)

[0101] Wherein, f RA0 is the retained austenite content information before compression; f RAε is the retained austenite content information after compression, ε is the true strain, and K is the mechanical stability coefficient of retained austenite.

[0102] It should be noted that the foregoing explanation of the embodiments of the test method for the stability of retained austenite in bearings is also applicable to the test device for the stability of retained austenite in bearings in this embodiment, and will not be elaborated here.

[0103] According to the test device for the stability of retained austenite in bearings provided by the embodiments of the present application, by selecting a plurality of target bearing steel rollers, obtaining the retained austenite content information of the plurality of target bearing steel rollers, and using the processing method for improving the stability of retained austenite in bearings, some of the target bearing steel rollers among the plurality of target bearing steel rollers are processed. Then, the same amount of compression performance tests are simultaneously performed on the unprocessed target bearing steel rollers and the processed target bearing steel rollers. According to the retained austenite content information before and after the compression performance test, the stability test result of the processed target bearing steel rollers is determined. If the processed target bearing steel rollers show a lower mechanical stability coefficient of retained austenite, it indicates that the processing has successfully enhanced the stability of retained austenite, thereby verifying the effectiveness of the processing technology.

[0104] Figure 7 The structural schematic diagram of the electronic device provided by the embodiments of the present application. The electronic device may include:

[0105] A memory 501, a processor 502, and a computer program stored on the memory 501 and executable on the processor 502.

[0106] When the processor 502 executes the program, it implements the processing method for improving the stability of retained austenite in bearings provided in the foregoing embodiments, or the test method for the stability of retained austenite in bearings.

[0107] Further, the electronic device further includes:

[0108] A communication interface 503 for communication between the memory 501 and the processor 502.

[0109] The memory 501 is used to store a computer program executable on the processor 502.

[0110] The memory 501 may include a high-speed RAM (Random Access Memory) memory, and may also include non-volatile memory, such as at least one disk memory.

[0111] If the memory 501, the processor 502, and the communication interface 503 are implemented independently, the communication interface 503, the memory 501, and the processor 502 can be interconnected through a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of simplicity of representation, Figure 7 only a thick line is used to represent it in the figure, but it does not mean that there is only one bus or one type of bus.

[0112] Optionally, in a specific implementation, if the memory 501, the processor 502, and the communication interface 503 are integrated on a single chip, the memory 501, the processor 502, and the communication interface 503 can communicate with each other through an internal interface.

[0113] The processor 502 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application.

[0114] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0115] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0116] Any process or method description shown in a flowchart or described otherwise herein can be understood to represent a module, segment, or portion of code including one or N executable instructions for implementing a customized logical function or process, and the scope of the preferred embodiments of the present application includes additional implementations, where the functions may be executed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present application pertain.

[0117] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, the steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays, field programmable gate arrays, etc.

[0118] Those of ordinary skill in the art of the present technology can understand that all or part of the steps carried by the methods for implementing the above embodiments can be completed by instructing relevant hardware through a program, and the above program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0119] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A treatment method for enhancing the stability of retained austenite in bearings, characterized in that, Including the following steps: Fix the target bearing steel roller in the cavity of the pulsed magnetic field treatment equipment; Obtain the pulsed magnetic field treatment parameters, input the pulsed magnetic field treatment parameters into the pulsed magnetic field treatment equipment, and the pulsed magnetic field treatment equipment generates a pulsed magnetic field based on the pulsed magnetic field treatment parameters; Treat the target bearing steel roller in the pulsed magnetic field, wherein the pulsed magnetic field promotes the depolymerization of Cottrell atmospheres in the material of the target bearing steel roller, causing the carbon atoms segregated in the Cottrell atmospheres to migrate to the retained austenite.

2. The treatment method for enhancing the stability of retained austenite in bearings according to claim 1, characterized in that The pulsed magnetic field treatment parameters include at least one of the pulsed magnetic field intensity and the number of pulsed magnetic field treatments.

3. A test method for the stability of retained austenite in bearings, characterized in that, Including the following steps: Select multiple target bearing steel rollers and obtain the retained austenite content information of the multiple target bearing steel rollers; Use the treatment method for enhancing the stability of retained austenite of the bearing according to any one of claims 1 or 2 to treat some of the multiple target bearing steel rollers; Conduct an equal amount of compression performance tests on the untreated target bearing steel rollers and the treated target bearing steel rollers simultaneously, and obtain the retained austenite content information after the compression performance tests of the untreated target bearing steel rollers and the treated target bearing steel rollers; Determine the stability test result of the treated target bearing steel roller according to the retained austenite content information before and after the compression performance test.

4. The test method for the stability of retained austenite in a bearing according to claim 3, wherein The process for obtaining the retained austenite content information includes: Conduct a magnetic property test on the target bearing steel roller to obtain the saturation magnetization intensity data; Calculate the retained austenite content information of the target bearing steel roller by using the relationship between the retained austenite content and the magnetization intensity and the saturation magnetization intensity data.

5. The test method for the stability of retained austenite in a bearing according to claim 4, characterized in that The relationship between the retained austenite content and the magnetization intensity is: Among them, M martensite is the magnetization intensity of pure martensite; M sample is the saturation magnetization intensity data.

6. The test method for the stability of retained austenite in a bearing according to claim 3, characterized in that, The determining the stability test result of the treated target bearing steel roller according to the retained austenite content information before and after the compression performance test includes: Calculate the retained austenite mechanical stability coefficient of the untreated target bearing steel roller according to the retained austenite content information before and after the compression performance test of the untreated target bearing steel roller; Calculate the retained austenite mechanical stability coefficient of the treated target bearing steel roller according to the retained austenite content information before and after the compression performance test of the treated target bearing steel roller; Determine the stability test result of the treated target bearing steel roller according to the respective retained austenite mechanical stability coefficients of the untreated target bearing steel roller and the treated target bearing steel roller.

7. The testing method for the stability of retained austenite in a bearing according to claim 6, wherein The calculation formula for the retained austenite mechanical stability coefficient is: f RAε = f RA0 exp(-Kε) Among them, f RA0 is the retained austenite content information before compression; f RAε is the retained austenite content information after compression, ε is the true strain, and K is the mechanical stability coefficient of retained austenite.

8. A treatment device for enhancing the stability of retained austenite in bearings, characterized in that, Including: A fixing module for fixing the target bearing steel roller in the cavity of the pulsed magnetic field treatment equipment; A generating module for obtaining the pulsed magnetic field treatment parameters, inputting the pulsed magnetic field treatment parameters into the pulsed magnetic field treatment equipment, and the pulsed magnetic field treatment equipment generates a pulsed magnetic field based on the pulsed magnetic field treatment parameters; A first processing module for processing the target bearing steel roller in the pulsed magnetic field, wherein the pulsed magnetic field promotes the depolymerization of Cottrell atmospheres in the material of the target bearing steel roller, so that the carbon atoms segregated in the Cottrell atmospheres migrate to the retained austenite.

9. A testing device for the stability of retained austenite in bearings, characterized in that, Comprising: A selection module for selecting a plurality of target bearing steel rollers and obtaining the retained austenite content information of the plurality of target bearing steel rollers; A second processing module for processing some of the plurality of target bearing steel rollers by using the processing method for enhancing the stability of retained austenite in the bearing according to any one of claims 1 or 2; A test module for simultaneously performing the same amount of compression performance tests on the untreated target bearing steel rollers and the processed target bearing steel rollers, and obtaining the retained austenite content information after the compression performance tests of the untreated target bearing steel rollers and the processed target bearing steel rollers; A determination module for determining the stability test result of the processed target bearing steel roller according to the retained austenite content information before and after the compression performance test.

10. An electronic device, characterized in that, Comprising: A memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the processing method for enhancing the stability of retained austenite in the bearing according to any one of claims 1-2, or the test method for the stability of retained austenite in the bearing according to any one of claims 3-7.

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