Method for improving performance of nitriding layer-containing part and nitriding layer-containing part

Abstract

The invention discloses a method for improving the performance of a part containing a nitriding layer and the part containing the nitriding layer, and the method comprises the following steps that the part containing the nitriding layer is subjected to pulsed magnetic field and ultrasonic coupling treatment; and the ratio k of the ultrasonic frequency T1 to the frequency T2 of the pulsed magnetic field is 4 * 10 < 4 >-2 * 10 < 5 >. According to the method, ultrasonic and magnetic field coupling treatment is carried out at the proper frequency, temperature rise is avoided in the treatment process, the structure stress of the nitriding layer-containing part can be optimized under the condition that the size precision and the wear resistance of the nitriding layer-containing part such as a hydraulic bushing are not reduced, the residual stress range of the nitriding layer-containing part is reduced, and the service life of the nitriding layer-containing part is prolonged. The problem that the fatigue life of nitriding layer-containing parts is short is solved; the method has the advantages of no damage, high efficiency, easiness in implementation, low cost, wide application range and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of post-processing of components containing nitriding layer, and particularly relates to a method for improving the performance of components containing nitriding layer and components containing nitriding layer. BACKGROUND

[0002] Components containing nitriding layer are widely and critically used in many industrial fields, such as aerospace, automobile manufacturing, mechanical engineering, etc. For example, in the automobile field, hydraulic bushings, as a typical representative of components containing nitriding layer, bear important functions such as buffering, shock absorption and force transmission in the automobile suspension system, and the performance of the hydraulic bushings directly affects the stability of the automobile, the comfort of the ride and the safety of the driving.

[0003] Nitriding treatment is a common means to improve the performance of the surface of the component, and by forming a nitriding layer on the surface of the component, the hardness, wear resistance, corrosion resistance and anti-seizure ability of the surface of the component can be significantly improved. However, the nitriding treatment process often introduces internal organizational stress in the components containing nitriding layer, resulting in uneven distribution of residual stress in the components, which is specifically manifested as a large residual stress range. This uneven residual stress state is one of the key factors affecting the performance and service life of the components. However, for finished products such as hydraulic bushings and other components containing nitriding layer, due to the high final dimensional accuracy, there is a lack of corresponding post-processing control method. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art. To this end, the present application proposes a method for improving the performance of components containing nitriding layer and components containing nitriding layer. By coupling ultrasonic and magnetic field treatment at a suitable frequency, the method can optimize the organizational stress of the components containing nitriding layer without reducing the dimensional accuracy and wear resistance of the components containing nitriding layer such as hydraulic bushings, and reduce the residual stress range, thereby solving the problem of insufficient fatigue life of the components containing nitriding layer. The method has the advantages of non-destructive, high efficiency, easy implementation, low cost and wide application range.

[0005] The first aspect of the present application proposes a method for improving the performance of components containing nitriding layer. According to embodiments of the present application, the method comprises the following steps:

[0006] coupling pulse magnetic field and ultrasonic treatment on the components containing nitriding layer;

[0007] wherein the ratio k of the frequency T1 of the ultrasonic and the frequency T2 of the pulse magnetic field ranges from 4x10 4 -2x10 5 .

[0008] The method for improving the performance of the component containing the nitriding layer according to the above-mentioned embodiments of the present application can optimize the microstructure stress of the component containing the nitriding layer, reduce the residual stress range thereof, and solve the problem of insufficient fatigue life of the component containing the nitriding layer, without reducing the dimensional accuracy and wear resistance of the component containing the nitriding layer such as the hydraulic bushing, by the ultrasonic and magnetic field coupling treatment at a suitable frequency without temperature rise.

[0009] In addition, the method for improving the performance of the component containing the nitriding layer according to the above-mentioned embodiments of the present application can further have the following additional technical features:

[0010] In some embodiments of the present application, the frequency of the pulsed magnetic field is 0.1-20 Hz.

[0011] In some embodiments of the present application, the magnetic field strength of the pulsed magnetic field is 0.1-0.6 T.

[0012] And / or, the number of treatments of the pulsed magnetic field is 100-200 times.

[0013] And / or, the single treatment time of the pulsed magnetic field is 360-720 s.

[0014] In some embodiments of the present application, the working condition parameters of the ultrasonic include a power of 200-800 W.

[0015] In some embodiments of the present application, the component containing the nitriding layer includes at least one of a hydraulic bushing and a guide rod.

[0016] In some embodiments of the present application, the step of coupling the pulsed magnetic field and the ultrasonic to treat the component containing the nitriding layer includes the following process:

[0017] The performance of the component containing the nitriding layer is tested to obtain the nitriding layer thickness H1, the residual stress range M1 and the hardness G1 of the component containing the nitriding layer before the coupling treatment of the pulsed magnetic field and the ultrasonic.

[0018] The pulsed magnetic field treatment and the ultrasonic treatment are simultaneously applied to the component containing the nitriding layer, and then the performance is tested to obtain the nitriding layer thickness H2, the residual stress range M2 and the hardness G2 of the component containing the nitriding layer after the coupling treatment of the pulsed magnetic field and the ultrasonic.

[0019] In some embodiments of the present application, the M1 and the M2 satisfy the following relationship:

[0020] M1-M2≥137 Mpa.

[0021] In some embodiments of the present application, the H1 and the H2 satisfy the following relationship:

[0022] H1-H2≤0.4μm;

[0023] and / or, the G1 and the G2 satisfy the following relationship:

[0024] |G1-G2|≤2HV.

[0025] In some embodiments of the present application, the method further comprises the following steps:

[0026] The nitrided layer-containing component treated by the pulse magnetic field and ultrasonic coupling is subjected to demagnetization treatment.

[0027] A second aspect of the present application provides a nitrided layer-containing component. According to embodiments of the present application, the nitrided layer-containing component is prepared by using the method for improving the performance of the nitrided layer-containing component according to any one of the first aspect. Thus, the nitrided layer-containing component has the characteristics of low residual stress difference, and the performance of the nitrided layer-containing component in terms of service life and the like is significantly improved.

[0028] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described below in detail by way of example, which are intended to explain the present application and cannot be understood as a limitation of the present application.

[0030] A first aspect of the present application provides a method for improving the performance of a nitrided layer-containing component. According to embodiments of the present application, the method comprises the following steps:

[0031] The nitrided layer-containing component is subjected to pulse magnetic field and ultrasonic coupling treatment;

[0032] wherein the ratio k of the frequency T1 of the ultrasonic and the frequency T2 of the pulse magnetic field ranges from 4x10 4 -2x10 5 .

[0033] In order to reduce the residual stress difference of the nitrided layer-containing component and improve its fatigue life, a variety of treatment methods have been proposed and applied. The traditional heat treatment annealing method releases and redistributes the internal stress of the component by heating the component to an appropriate temperature and maintaining it for a certain time, and then slowly cooling it. However, this method has obvious defects. The heating process will cause the size of the component to change. For some nitrided layer-containing components with extremely high dimensional accuracy requirements, such as high-precision hydraulic bushings, additional finishing processes are often required to restore their dimensional accuracy after heat treatment annealing. This not only increases the production cost and production cycle, but also may introduce new stress due to multiple processing, affecting the overall performance of the component.

[0034] The method for improving the performance of the component containing the nitriding layer in the above-mentioned embodiments of the application can optimize the microstructure stress of the component containing the nitriding layer, reduce the residual stress range, and solve the problem of insufficient fatigue life of the component containing the nitriding layer, without reducing the size precision and wear resistance of the component containing the nitriding layer such as the hydraulic bushing, by the coupling treatment of the ultrasonic wave and the magnetic field at a suitable frequency without temperature rise.

[0035] In the embodiments of the application, the coupling treatment of the pulse magnetic field and the ultrasonic wave refers to a combined process technology by synchronously applying the pulse magnetic field and the ultrasonic wave. The core is to weaken the bonding strength between metal atoms by the energy interaction of the magnetic field and the ultrasonic wave, to help the migration and annihilation of the micro defects such as the dislocation at the brittle phase interface and the high stress area by synchronously applying the ultrasonic vibration, to realize the stress homogenization and the improvement of the microstructure stability, especially the effective relaxation of the stress at the brittle phase interface, and to significantly improve the fatigue life of the nitriding part. At the same time, since the energy of the applied external field is 2-4 orders of magnitude less than the heat treatment energy, the temperature does not rise during the treatment process, which is suitable for the final post-treatment of the finished product of the component containing the nitriding layer such as the hydraulic bushing, without affecting the precision of the product.

[0036] Further, in the embodiments of the application, the ratio k (i.e. T1 / T2) of the frequency T1 of the ultrasonic wave and the frequency T2 of the pulse magnetic field ranges from 4×10 4 to 2×10 5 (for example, it can be 7×10 4 , 8×10 4 , 1×10 5 , 1.5×10 5 , etc.), which is beneficial to the coupling effect of the ultrasonic wave and the pulse magnetic field, the excitation and the interaction of the broken bonds, and the improvement of the microstructure homogenization effect; if the ratio k is too small (i.e. k<4×10 4 , the adverse effect is that the ultrasonic wave activation energy is insufficient and the pulse magnetic field cannot play a role; and if the ratio k is too large (i.e. k>2×10 5 , the adverse effect is that the temperature of the test piece rises, the precision of the test sample cannot be maintained, and the energy consumption increases.

[0037] According to some specific embodiments of the application, the frequency of the pulse magnetic field is 0.1-20 Hz, for example, it can be 1 Hz, 3 Hz, 5 Hz, 7 Hz, 9 Hz, 11 Hz, 13 Hz, 15 Hz, 17 Hz, 19 Hz, etc.

[0038] According to some specific embodiments of the application, the magnetic field strength of the pulse magnetic field is 0.5-1 T, for example, it can be 0.5 T, 0.6 T, 0.7 T, 0.8 T, 0.9 T, etc.

[0039] According to some specific embodiments of the present application, the number of times of the pulsed magnetic field treatment is 100-200, for example, can be 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, etc.

[0040] According to some specific embodiments of the present application, the single treatment time of the pulsed magnetic field is 360-720s, for example, can be 360s, 420s, etc.

[0041] According to some specific embodiments of the present application, the working condition parameters of the ultrasound include: the power is 200-800W, for example, can be 200W, 500W, etc.

[0042] According to some specific embodiments of the present application, the nitrided layer-containing component includes at least one of a hydraulic bushing and a guide rod. The present application does not specially limit the type of the nitrided layer-containing component, for example, can be a hydraulic bushing with a size of Ф10mm*35mm.

[0043] According to some specific embodiments of the present application, the step of coupling the pulsed magnetic field and the ultrasound to treat the nitrided layer-containing component includes the following processes: performing performance testing on the nitrided layer-containing component to obtain the nitrided layer thickness H1, the residual stress range M1 and the hardness G1 of the nitrided layer-containing component before the coupling treatment of the pulsed magnetic field and the ultrasound; simultaneously applying the pulsed magnetic field treatment and the ultrasound treatment to the nitrided layer-containing component, and then performing performance testing to obtain the nitrided layer thickness H2, the residual stress range M2 and the hardness G2 of the nitrided layer-containing component after the coupling treatment of the pulsed magnetic field and the ultrasound. Thus, the improvement degree of the nitrided layer-containing component can be evaluated by the performance testing before and after the coupling treatment of the pulsed magnetic field and the ultrasound. It should be noted that the above-mentioned nitrided layer thickness can be detected by detection methods commonly used in the art, such as hardness method, metallographic method, etc., the residual stress range can be detected by existing detection methods, such as blind hole method, X-ray diffraction method, etc., and the hardness can be detected by existing detection methods, such as indentation method, rebound method, etc.

[0044] According to some specific embodiments of the present application, M1 and M2 satisfy the following relationship: M1-M2≥137Mpa (the maximum value of M1-M2 can be up to 199Mpa), and "M1-M2" represents the difference between the residual stress range M1 and the residual stress range M2. It can be seen that the residual stress range of the nitrided layer-containing component is significantly reduced before and after the coupling treatment of the pulsed magnetic field and the ultrasound.

[0045] According to some embodiments of the present application, H1 and H2 satisfy the following relationship: H1-H2≤0.4 μm, wherein "H1-H2" represents the difference between the thickness H1 of the nitriding layer and the thickness H2 of the nitriding layer. It can be seen that the thickness of the nitriding layer before and after the pulse magnetic field and ultrasonic coupling treatment of the component containing a nitriding layer does not change significantly, and the microstructure stress of the component containing a nitriding layer can be optimized without reducing the size precision of the component containing a nitriding layer such as a hydraulic bushing, and the residual stress range is reduced.

[0046] According to some embodiments of the present application, G1 and G2 satisfy the following relationship: |G1-G2|≤2HV, wherein "|G1-G2|" represents the absolute value of the difference between G1 and G2. It can be seen that the hardness before and after the pulse magnetic field and ultrasonic coupling treatment of the component containing a nitriding layer does not change significantly, and the microstructure stress of the component containing a nitriding layer can be optimized without reducing the wear resistance of the component containing a nitriding layer such as a hydraulic bushing, and the residual stress range is reduced.

[0047] According to some embodiments of the present application, the method further comprises the following step: demagnetizing the component containing a nitriding layer after the pulse magnetic field and ultrasonic coupling treatment. In order for some components containing a nitriding layer to be better suitable for actual working conditions, the component containing a nitriding layer can be demagnetized according to actual conditions (such as the knocking method, the reverse magnetic field method, the alternating current demagnetization method, and the direct current demagnetization method commonly used in the art, etc.); for some components containing a nitriding layer which are not affected by magnetism, the operation is not required. Thus, taking the hydraulic bushing as an example, the method for improving the performance of the component containing a nitriding layer provided by the present application comprises the following specific operation steps: S1: nitriding the hydraulic bushing blank; S2: machining into a finished product; S3: testing the penetration layer depth and the residual stress of the product, and statistically obtaining the average value of the penetration layer thickness and the corresponding stress range; S4: fixing the hydraulic bushing in the waveguide solution cavity and placing it in the pulse magnetic field generator, and inputting the magnetic field treatment parameters and the ultrasonic treatment parameters; S5: starting the equipment to simultaneously perform the pulse magnetic field treatment and the ultrasonic treatment on the hydraulic bushing; S6: demagnetizing the residual magnetism of the product; and S7: detecting and evaluating the stress state of the product.

[0048] The second aspect of the present application provides a component containing a nitriding layer. According to embodiments of the present application, the component containing a nitriding layer is prepared by using the method for improving the performance of the component containing a nitriding layer according to any one of the first aspect. Thus, the component containing a nitriding layer has the characteristics of a low residual stress range, and the performance of the component containing a nitriding layer in terms of service life and other aspects is significantly improved.

[0049] The embodiments of the present application are described in detail below, it should be noted that the embodiments described below are exemplary, only for explaining the present application, and can not be understood as limiting the present application. In addition, if not specifically stated, all reagents used in the following examples are commercially available or can be synthesized according to the methods described herein or known methods, and the reaction conditions not listed are also readily available to those skilled in the art.

[0050] Example 1

[0051] The present embodiment provides a method for improving the performance of components containing nitriding layer, taking 42CrMo hydraulic bushing as an example, the method comprises the following steps:

[0052] The finished 42CrMo hydraulic bushing (sample size is Ф10mm x 35mm, a total of 3) is subjected to magnetic field-ultrasonic coupling treatment;

[0053] The magnetic field strength is 0.5T, the magnetic field treatment frequency is 20Hz, the magnetic field treatment frequency is 150 times, and the single magnetic field treatment time is 420s; the ultrasonic frequency is 1.6x10 6 Hz (i.e. k value is 8x10 4 ), and the ultrasonic power is 200W.

[0054] Example 2

[0055] The present embodiment provides a method for improving the performance of components containing nitriding layer, which is only different from example 1 in that:

[0056] (1) the component containing nitriding layer is 52100 guide rod;

[0057] (2) the magnetic field strength is 0.6T, the magnetic field treatment frequency is 10Hz, and the magnetic field treatment frequency is 200 times;

[0058] (3) the ultrasonic frequency is 1.0x10 6 Hz (i.e. k value is 1x10 5 ).

[0059] Example 3

[0060] The present embodiment provides a method for improving the performance of components containing nitriding layer, which is only different from example 1 in that:

[0061] (1) the magnetic field treatment frequency is 0.1Hz;

[0062] (2) the ultrasonic frequency is 4.0x10 5 Hz (i.e. k value is 4x10 4 ).

[0063] Example 4

[0064] The embodiment provides a method for improving the performance of a component containing a nitriding layer, and the difference from the embodiment 1 is only that:

[0065] (1) the magnetic field treatment frequency is 5 Hz;

[0066] (2) the ultrasonic frequency is 5*10 5 Hz (i.e. the k value is 1*10 5 ).

[0067] Embodiment 5

[0068] The embodiment provides a method for improving the performance of a component containing a nitriding layer, and the difference from the embodiment 1 is only that:

[0069] (1) the magnetic field treatment frequency is 10 Hz;

[0070] (2) the ultrasonic frequency is 2*10 6 Hz (i.e. the k value is 2*10 5 ).

[0071] Embodiment 6

[0072] The embodiment provides a method for improving the performance of a component containing a nitriding layer, and the difference from the embodiment 1 is only that:

[0073] (1) the magnetic field intensity of the pulse magnetic field is 0.70 T.

[0074] Embodiment 7

[0075] The embodiment provides a method for improving the performance of a component containing a nitriding layer, and the difference from the embodiment 1 is only that:

[0076] (1) the magnetic field intensity of the pulse magnetic field is 0.08 T.

[0077] Comparative Example 1

[0078] The comparative example provides a method for improving the performance of a component containing a nitriding layer, and the difference from the embodiment 1 is only that:

[0079] (1) only magnetic field treatment is performed.

[0080] The specific process of the method is as follows: the 42CrMo hydraulic bushing finished product (the sample size is Φ10mm*35mm, and a total of three are prepared) is subjected to magnetic field treatment; wherein the magnetic field intensity is 0.5 T, the magnetic field treatment frequency is 20 Hz, the magnetic field treatment frequency is 150 times, and the magnetic field single treatment time is 420 s.

[0081] Comparative Example 2

[0082] The comparative example provides a method for improving the performance of a component containing a nitriding layer, and the difference from the embodiment 1 is only that:

[0083] (1) only ultrasonic treatment is performed.

[0084] The specific process of the method is as follows: 42CrMo hydraulic bushing finished products (sample size is Ф10 mm x 35 mm, a total of 3) are subjected to ultrasonic treatment; wherein the ultrasonic frequency is 1.6 x 10 6 Hz, the ultrasonic treatment frequency is 150 times, the ultrasonic single treatment time is the same as the magnetic field single treatment time in Example 1, and the ultrasonic power is the same as the ultrasonic power in Example 1.

[0085] Comparative Example 3

[0086] This comparative example provides a method for improving the performance of components containing nitriding layers, which is only different from Example 1 in that:

[0087] (1) the value of k is 1 x 10 4 (That is, the ultrasonic frequency is adjusted to 2 x 10 5 Hz).

[0088] Comparative Example 4

[0089] This comparative example provides a method for improving the performance of components containing nitriding layers, which is only different from Example 1 in that:

[0090] (1) the value of k is 5 x 10 5 (That is, the ultrasonic frequency is adjusted to 1 x 10 7 Hz).

[0091] Test Example

[0092] This test example detects the performance of the 42CrMo hydraulic bushing finished product samples before and after magnetic field-ultrasonic coupling treatment in the above examples and comparative examples.

[0093] The test method is as follows:

[0094] 1) Nitriding layer thickness test: the thickness of the nitriding layer is evaluated according to the metallographic structure and microhardness.

[0095] 2) Residual stress range test: the residual stress value is measured by an X-ray diffractometer.

[0096] 3) Hardness test: the hardness is tested by Vickers hardness, and the loading load is 200 g.

[0097] The nitrided layer thickness and residual stress range of each sample before and after the magnetic field-ultrasonic coupling treatment are tested 7 times and the average values are taken, and the test results are shown in Tables 1 and 2; wherein, the nitrided layer thickness of the sample containing the nitrided layer before the pulse magnetic field-ultrasonic coupling treatment is denoted as H1, the residual stress range is denoted as M1, and the hardness is denoted as G1; the nitrided layer thickness of the sample containing the nitrided layer after the pulse magnetic field-ultrasonic coupling treatment is denoted as H2, the residual stress range is denoted as M2, and the hardness is denoted as G2.

[0098] Table 1

[0099] Test Group H1 (μm) H2 (μm) M1 (Mpa) M2 (Mpa) G1 (HV) G2 (HV) Example 1 70.2 69.8 334 135 530 531 Example 2 100.8 100.8 256 120 556 556 Example 3 75.3 75.2 324 125 532 531 Example 4 72.6 72.6 335 158 532 533 Example 5 71.2 71.2 314 176 531 531 Example 6 74.5 74.3 306 128 528 528 Example 7 72.4 72.3 338 201 530 532 Comparative Example 1 70.4 70.4 356 301 530 531 Comparative Example 2 72.0 71.9 345 325 535 534 Comparative Example 3 72.4 72.4 348 296 527 527 Comparative Example 4 73.5 73.0 312 249 526 510

[0100] Table 2

[0101]

[0102]

[0103] It can be seen from Tables 1 and 2 that when the ratio k of the frequency T1 of the ultrasonic and the frequency T2 of the pulse magnetic field ranges from 4x10-2 to 2x10-1, the residual stress range is significantly reduced, and the range reduction is 137-199 MPa. When the magnetic field or the ultrasonic field is used alone, the residual stress range is reduced, but the reduction is small. Further analysis of the frequency matching relationship shows that when the frequency ratio is lower than the lower limit, there is no coupling effect. When the frequency ratio is greater than the upper limit, the stress range reduction is increased, but at the same time, the microhardness is significantly reduced, which is detrimental to the wear resistance. 4 -2×10 5

[0104] Therefore, by the ultrasonic and magnetic field coupling treatment at the appropriate frequency, the present application can optimize the microstructure and stress of the component containing the nitrided layer such as the hydraulic bushing without reducing the dimensional accuracy and wear resistance, and solve the problem of insufficient fatigue life of the component containing the nitrided layer.

[0105] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means 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 the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0106] ​Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A method of improving the properties of a component comprising a nitrided layer, characterized in that, The method comprises the following steps: The method comprises the following steps: wherein the ratio k of the frequency T1 of the ultrasound and the frequency T2 of the pulsed magnetic field ranges from 4x10 4 -2x10 5 .

2. The method of improving the performance of a part containing a nitrided layer according to claim 1, wherein, The method comprises the following steps:

3. The method of improving the performance of a part containing a nitrided layer according to claim 2, wherein, The frequency of the pulse magnetic field is 0.1-20Hz. The magnetic field strength of the pulse magnetic field is 0.1-0.6T. And / or, the number of times of the pulse magnetic field treatment is 100-200 times.

4. The method of improving the performance of a component containing a nitrided layer according to claim 1 wherein, And / or, the single treatment time of the pulse magnetic field is 360-720s.

5. The method of improving the properties of a part containing a nitrided layer according to any one of claims 1 to 4, characterized in that, The working condition parameters of the ultrasonic treatment include: the power is 200-800W.

6. The method of improving the properties of a part containing a nitrided layer according to any one of claims 1 to 4, characterized in that, The component with nitriding layer includes at least one of hydraulic bushing and guide rod. The step of coupling pulse magnetic field and ultrasonic treatment on the component with nitriding layer comprises the following processes: The performance of the component with nitriding layer is tested to obtain the nitriding layer thickness H1, residual stress range M1 and hardness G1 of the component with nitriding layer before the coupling pulse magnetic field and ultrasonic treatment.

7. The method of improving the performance of a component containing a nitrided layer according to claim 6, wherein The component with nitriding layer is simultaneously subjected to pulse magnetic field treatment and ultrasonic treatment, and then the performance is tested to obtain the nitriding layer thickness H2, residual stress range M2 and hardness G2 of the component with nitriding layer after the coupling pulse magnetic field and ultrasonic treatment. The M1 and the M2 satisfy the following relationship:

8. The method of improving the performance of a component containing a nitrided layer according to claim 6 wherein, M1-M2≥137Mpa. The H1 and the H2 satisfy the following relationship: H1-H2≤0.4μm. And / or, the G1 and the G2 satisfy the following relationship:

9. The method of improving the performance of a component containing a nitrided layer according to claim 6 wherein, |G1-G2|≤2HV. The method further comprises the following steps:

10. A nitrided layer-containing component, characterized by, The component with nitriding layer after the coupling pulse magnetic field and ultrasonic treatment is subjected to demagnetization treatment. The component with nitriding layer is prepared by the method for improving the performance of the component with nitriding layer according to any one of claims 1-9.

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