Ultrasonic test block for corrosion defects and method for detecting same

Abstract

The application discloses an ultrasonic test block for corrosion defects and a detection method thereof, which is used for detecting the surface and internal corrosion defects of an aero-engine sensitive part and determining the equivalent thereof. The ultrasonic test block for corrosion defects comprises a plurality of corrosion defect test blocks and a transverse and longitudinal resolution test block, wherein the corrosion defect test blocks are different in corrosion defect type; the corrosion defect type of the corrosion defect test blocks is determined according to the corrosion defect type of a target workpiece; the corrosion defect test blocks of the same corrosion defect type comprise a plurality of corrosion defect test blocks of different equivalents, which are used for correcting an ultrasonic detection device; and the equivalent of the target workpiece is determined based on the ultrasonic detection results of the corrosion defect test blocks of the same corrosion defect type and the target workpiece by the ultrasonic detection device; and the transverse and longitudinal resolution test block comprises a plurality of groups of corrosion defects with different depth difference values, which are used for correcting the detection accuracy of the ultrasonic detection device in the transverse and longitudinal directions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engines, and particularly relates to an ultrasonic test block for corrosion defects and a detection method thereof. BACKGROUND

[0002] Currently, the corrosion defect detection of aero-engine sensitive parts can only evaluate the surface or near-surface defects, and cannot be applied to the internal equivalent detection or inner wall corrosion defect equivalent detection of the sensitive parts. The existing ultrasonic detection technology can detect internal defects, but the detection sensitivity and accuracy of surface defects are far lower than the current aero-engine sensitive part corrosion defect detection method. SUMMARY

[0003] The present application aims to provide an ultrasonic test block for corrosion defects and a detection method thereof, which is used for detecting the surface and internal corrosion defects of aero-engine sensitive parts and determining the equivalent thereof.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] An ultrasonic test block for corrosion defects comprises a plurality of corrosion defect test blocks and a transverse and longitudinal resolution test block, and the corrosion defect types of the plurality of corrosion defect test blocks are different;

[0006] The corrosion defect types of the plurality of corrosion defect test blocks are determined by the corrosion defect types of a target workpiece, the corrosion defect test blocks of the same corrosion defect type comprise a plurality of corrosion defect test blocks with different equivalents, which are used for correcting an ultrasonic detection device, and based on the ultrasonic detection results of the corrosion defect test blocks of the same corrosion defect type and the target workpiece by the ultrasonic detection device, the equivalent of the target workpiece is determined;

[0007] The transverse and longitudinal resolution test block comprises a plurality of groups of corrosion defects with different depth difference values, which are used for correcting the detection accuracy of the ultrasonic detection device in the transverse and longitudinal directions.

[0008] Compared with the prior art, the ultrasonic test block for corrosion defects provided by the application comprises a plurality of corrosion defect test blocks and a transverse and longitudinal resolution test block, wherein the corrosion defect types of the plurality of corrosion defect test blocks are different, and the defect types of the plurality of corrosion defect test blocks are determined according to the corrosion defect types of the target workpiece, that is, the corrosion defect test block of the corresponding corrosion defect type can be determined from the plurality of corrosion defect test blocks according to the corrosion defect types of the target workpiece, and then the ultrasonic detection equipment is calibrated by using the test block, so that the ultrasonic detection equipment can be used to detect corrosion defects and improve the detection accuracy of corrosion defects. Therefore, the detection accuracy of the ultrasonic detection equipment for corrosion defects can be further improved by using the transverse and longitudinal resolution test block to calibrate the detection accuracy of the ultrasonic detection equipment in the transverse and longitudinal directions. When the ultrasonic detection equipment calibrated by using the ultrasonic test block for corrosion defects is used to detect the corrosion defects of the target workpiece, the detection result of the ultrasonic detection equipment is more accurate because the ultrasonic detection equipment has been calibrated by using the test block.

[0009] The application also provides a detection method for corrosion defects, comprising:

[0010] Obtaining corrosion defect parameters and workpiece parameters of a target workpiece, wherein the corrosion defect parameters comprise a corrosion defect type, a corrosion defect position and a corrosion defect morphology, and the workpiece parameters comprise a thickness and a diameter of the target workpiece;

[0011] Determining a target ultrasonic detection equipment and a target ultrasonic test block based on the corrosion defect parameters and the workpiece parameters of the target workpiece, wherein the target ultrasonic test block is the plurality of corrosion defect test blocks and the transverse and longitudinal resolution test block in the ultrasonic test block for corrosion defects.

[0012] Calibrating the target ultrasonic detection equipment by using the target ultrasonic test block;

[0013] Detecting the plurality of corrosion defect test blocks in the target ultrasonic test block and the target workpiece by using the calibrated target ultrasonic detection equipment to obtain a plurality of test block detection results and a target workpiece detection result;

[0014] Determining a corrosion defect equivalent of the target workpiece based on the plurality of test block detection results and the target workpiece detection result.

[0015] Compared with the prior art, the detection method for corrosion defects provided by the application has the same beneficial effects as the ultrasonic test block for corrosion defects described in the above technical solution, and details are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings used to provide further understanding of the application and form a part of the application, and the illustrative embodiments of the application and the description thereof are used to explain the application, and do not constitute improper limitations on the application. In the drawings:

[0017] Figure 1A A schematic diagram of a corrosion defect test block of the first type of corrosion defect provided in an exemplary embodiment of this application is shown;

[0018] Figure 1B A second schematic diagram of a corrosion defect test block of the first type of corrosion defect provided in an exemplary embodiment of this application is shown;

[0019] Figure 2A A schematic diagram of a corrosion defect test block of the second type of corrosion defect provided in an exemplary embodiment of this application is shown;

[0020] Figure 2B A second schematic diagram of a corrosion defect test block of the second type of corrosion defect provided in an exemplary embodiment of this application is shown.

[0021] Figure 3A A schematic diagram of a transverse and longitudinal resolution test block provided in an exemplary embodiment of this application is shown.

[0022] Figure 3B A second schematic diagram of the longitudinal and transverse resolution test block provided in an exemplary embodiment of this application is shown;

[0023] Figure 4 A flowchart of a corrosion defect detection method according to an exemplary embodiment of this application is shown;

[0024] Figure 5 A flowchart of a corrosion defect detection method according to an exemplary embodiment of this application is shown below;

[0025] Figure 6 A flowchart of a corrosion defect detection method according to an exemplary embodiment of this application is shown in Figure 3.

[0026] Figure 7 The flowchart illustrates a method for detecting corrosion defects according to an exemplary embodiment of this application. Figure Four ;

[0027] Figure 8 The flowchart illustrates a method for detecting corrosion defects according to an exemplary embodiment of this application. Figure Five ;

[0028] Figure 9 The flowchart illustrates a method for detecting corrosion defects according to an exemplary embodiment of this application. Figure Six ;

[0029] Figure 10 The flowchart illustrates a method for detecting corrosion defects according to an exemplary embodiment of this application. Figure Seven .

[0030] Reference signs:

[0031] 100 - Corrosion defect test block; 110 - Large flat bottom corrosion defect; 120 - Flat bottom hole corrosion defect; 200 - Horizontal and vertical resolution test block; 210 - Multiple sets of corrosion defects. DETAILED DESCRIPTION

[0032] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified. The meaning of "several" is one or more, unless otherwise explicitly specified.

[0035] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only used for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0036] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] With the increase of the service time of the aero-engine in the marine environment, the corrosion damage risk of the aero-engine is also rising. Based on the requirements of long service life and high reliability of the aero-engine, the detection and evaluation of the internal defect quality of the sensitive parts of the aero-engine become urgent problems to be solved.

[0038] At present, the non-destructive testing technologies for corrosion defects of the sensitive parts of the aero-engine include penetration, eddy current, magnetic powder and the like. However, these methods can only evaluate the defects on the surface and near the surface of the sensitive parts, and cannot be applied to the internal equivalent detection or inner wall corrosion defect equivalent detection of the corrosion defects of the sensitive parts.

[0039] The ultrasonic detection technology is often used to detect internal defects, but its detection sensitivity and accuracy for surface and near-surface defects are much lower than those of the penetration, magnetic powder and eddy current technologies, and the core reason lies in the performance constraints of the ultrasonic detection system. The existing ultrasonic probe design is originally intended to detect internal defects, and its frequency, focal length and other parameters are more suitable for deep signal. The longitudinal resolution (the ability to distinguish defects of different depths) depends on the probe frequency and pulse length: the low-frequency probe (such as 2.5-5MHz) has a long pulse and low longitudinal resolution (usually ≥1mm), and cannot distinguish surface and near-surface defects; although the high-frequency probe (such as 15-20MHz) can improve the resolution, the energy decays quickly, the penetration depth is limited, and it is more sensitive to surface roughness (easy to produce clutter), and its practicability is limited.

[0040] In order to overcome the above problems, the present application provides an ultrasonic test block for corrosion defects and a detection method thereof, so as to improve the accuracy of ultrasonic detection of corrosion defects of the sensitive parts of the aero-engine, and has important significance for ultrasonic detection and quantification of corrosion defects.

[0041] Figure 1A Fig. 1 shows a schematic diagram of a corrosion defect test block of a first corrosion defect type provided by an example embodiment of the present application, Figure 1B Fig. 2 shows a schematic diagram of a corrosion defect test block of a first corrosion defect type provided by an example embodiment of the present application. As shown in Figure 1A and Figure 1B The ultrasonic test block for corrosion defects provided by the example embodiment of the present application includes a plurality of corrosion defect test blocks 100 and a transverse and longitudinal resolution test block 200.

[0042] As shown in Figure 1A and Figure 1BAs shown, the corrosion defect types of the plurality of corrosion defect test blocks 100 are different, and the corrosion defect types of the plurality of corrosion defect test blocks 100 are determined according to the corrosion defect types of the target workpiece, so that the detection result is more accurate when the ultrasonic detection equipment corrected by the corresponding corrosion defect test block 100 is used to detect the target workpiece. The corrosion defect test blocks 100 of the same corrosion defect type include a plurality of corrosion defect test blocks 100 of different equivalent, which are used to correct the ultrasonic detection equipment, and the equivalent of the target workpiece is determined based on the ultrasonic detection results of the ultrasonic detection equipment on the corrosion defect test blocks 100 of the same corrosion defect type and the target workpiece.

[0043] In practical application, Figure 2A Fig. 1 shows a schematic diagram of a corrosion defect test block of a second corrosion defect type provided by an example embodiment of the present application, Figure 2B Fig. 2 shows a schematic diagram of a corrosion defect test block of a second corrosion defect type provided by an example embodiment of the present application. As shown in Figure 2A and Figure 2B As shown, the corrosion defect types of the plurality of corrosion defect test blocks 100 are different, and the corrosion defect types of the plurality of corrosion defect test blocks 100 are determined according to the corrosion defect types of the target workpiece, so that the detection result is more accurate when the ultrasonic detection equipment corrected by the corresponding corrosion defect test block 100 is used to detect the target workpiece. The corrosion defect test blocks 100 of the same corrosion defect type include a plurality of corrosion defect test blocks 100 of different equivalent, which are used to correct the ultrasonic detection equipment, and the equivalent of the target workpiece is determined based on the ultrasonic detection results of the ultrasonic detection equipment on the corrosion defect test blocks 100 of the same corrosion defect type and the target workpiece.

[0044] Figure 3A Fig. 3 shows a schematic diagram of a horizontal and vertical resolution test block provided by an example embodiment of the present application, Figure 3B Fig. 4 shows a schematic diagram of a horizontal and vertical resolution test block provided by an example embodiment of the present application. As shown in Figure 3A and Figure 3BAs shown, in order to further improve the detection accuracy of the ultrasonic testing equipment, and avoid the problem of poor corrosion defect recognition accuracy caused by insufficient lateral and longitudinal resolution, the ultrasonic test block of the corrosion defect of the present application also includes a lateral and longitudinal resolution test block 200. The lateral and longitudinal resolution test block 200 includes multiple groups of corrosion defects 210 with different depth difference values, which are used to correct the detection accuracy of the ultrasonic testing equipment in the lateral and longitudinal directions.

[0045] In some optional manners, as shown in Figures 1A-3B As shown, the depth difference values of the multiple different equivalent corrosion defect test blocks 100 of the same defect type are 0.5 mm, and the defect depths of the multiple different equivalent corrosion defect test blocks 100 of the same defect type are 5 mm. When the ultrasonic testing equipment is corrected for sound velocity and zero position by using multiple corrosion defect test blocks 100 with different depths and thicknesses, the detection accuracy of the corrosion defect of the target workpiece by the corrected ultrasonic testing equipment is higher.

[0046] In some optional manners, as shown in Figures 1A-3B As shown, the above-mentioned different types of corrosion defect test blocks 100 can include multiple large flat bottom corrosion defect test blocks (such as Figure 1A and Figure 1B As shown) and multiple flat hole corrosion defect test blocks (such as Figure 2A and Figure 2B As shown). At this time, the multiple large flat bottom corrosion defect test blocks include large flat bottom defects with a diameter of 10 mm, and the multiple flat hole corrosion defect test blocks include flat hole defects with a diameter of 0.4 mm to 1.0 mm. For example, the flat hole defect diameter can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1.0 mm, etc., and is not limited thereto.

[0047] For example, when the above-mentioned corrosion defect test block is a large flat bottom corrosion defect test block, the large flat bottom corrosion defect test block can be a cylindrical test block with a diameter of 50 mm, and each cylindrical test block contains one large flat bottom artificial defect with a diameter of 10 mm. When the corrosion defect test block includes 8 different equivalent large flat bottom artificial defect test blocks, the depths thereof are 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 8 mm, and 10 mm, respectively, and the thicknesses of the corresponding corrosion test blocks are 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 9 mm, 10 mm, 13 mm, and 15 mm, respectively, that is, the large flat bottom artificial defect depth is 5 mm.

[0048] For example, when the aforementioned corrosion defect test block is a flat-bottomed hole corrosion defect test block, the flat-bottomed hole corrosion defect test block can be a cylindrical test block with a diameter of 50 mm. Each cylindrical test block contains one artificial flat-bottomed hole defect with a diameter of 0.4 mm to 1.0 mm. When the corrosion defect test block includes 8 flat-bottomed hole artificial defect test blocks of different equivalents, their burial depths are 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 8 mm, and 10 mm, respectively. The corresponding thicknesses of the corrosion test blocks are 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 9 mm, 10 mm, 13 mm, and 15 mm, respectively, meaning the depth of the artificial flat-bottomed hole defect is 5 mm.

[0049] like Figures 1A-3B As shown, in order to further improve the recognition accuracy of the ultrasonic testing equipment in terms of lateral and longitudinal resolution, and to improve the detection accuracy of the ultrasonic testing equipment in terms of corrosion defects, the aforementioned lateral and longitudinal resolution test block 200 includes multiple groups of corrosion defects with a burial depth difference of 0.2mm-0.5mm. Each group of corrosion defects includes two flat-bottomed holes with different burial depths. The diameter of each flat-bottomed hole is 0.4mm, and the center distance between two adjacent flat-bottomed holes in each group is 2mm. After the ultrasonic testing equipment is calibrated by the lateral and longitudinal resolution test block, the ultrasonic testing equipment's ability to identify minute corrosion defects can be guaranteed.

[0050] For example, the aforementioned transverse and longitudinal resolution test block can be three test blocks with flat-bottomed holes of different burial depths, or it can be a test block with three sets of flat-bottomed holes of different burial depths. Each set of corrosion defects includes two flat-bottomed holes with different burial depths, the depth differences being 0.5 mm, 0.3 mm, and 0.2 mm, respectively, used for transverse and longitudinal resolution testing, to test and evaluate the detection system and probe's ability to distinguish adjacent corrosion defects at the same depth laterally and to distinguish corrosion defects at different depths longitudinally. Each set of flat-bottomed hole defects includes flat-bottomed holes with a diameter of 0.4 mm and a center-to-center distance of 2 mm, used for transverse resolution testing.

[0051] In some alternative methods, such as Figures 1A-3B As shown, the material and surface roughness of the multiple corrosion defect test blocks 100 of the same defect type but with different equivalents are the same as those of the target workpiece. The material and surface roughness of the transverse and longitudinal resolution test block 200 are the same as those of the target workpiece, so as to reduce the influence of material on the ultrasonic testing equipment.

[0052] This application also provides a method for detecting corrosion defects, used to detect the equivalent of corrosion defects on the surface, near surface, and inside of sensitive components of an aero-engine. Figure 4 A flowchart of a corrosion defect detection method according to an exemplary embodiment of this application is shown. Figure 4As shown, the method for detecting the corrosion defect includes:

[0053] Step 410: Obtain the corrosion defect parameters and the workpiece parameters of the target workpiece. It should be understood that the corrosion defect parameters herein include the corrosion defect type, the corrosion defect position and the corrosion defect morphology, wherein the corrosion defect type can include a large flat bottom corrosion defect or a flat hole corrosion defect, and is not limited thereto. The corrosion defect position can be marked according to the area of the corrosion defect in the target workpiece, so as to determine the thickness at the corresponding corrosion defect according to the design drawing of the target workpiece, so as to select the corrosion defect test block with the corresponding thickness. The workpiece parameters include the thickness and the diameter of the target workpiece. The thickness of the target workpiece can be obtained according to the design drawing of the target workpiece, or can be obtained by using related equipment for detection.

[0054] Step 420: Determine the target ultrasonic detection equipment and the target ultrasonic test block based on the corrosion defect parameters and the workpiece parameters of the target workpiece, wherein the target ultrasonic test block is a plurality of corrosion defect test blocks and the transverse and longitudinal resolution test block in the above-mentioned ultrasonic test block of the corrosion defect.

[0055] Step 430: Calibrate the target ultrasonic detection equipment by using the target ultrasonic test block.

[0056] Step 440: Detect the plurality of corrosion defect test blocks and the target workpiece by using the calibrated target ultrasonic detection equipment, and obtain a plurality of test block detection results and a target workpiece detection result.

[0057] Step 450: Determine the corrosion defect equivalent of the target workpiece based on the plurality of test block detection results and the target workpiece detection result.

[0058] Compared with the prior art, the method for detecting the corrosion defect provided in the embodiments of the present application has the same beneficial effects as the above-mentioned ultrasonic test block of the corrosion defect, which will not be repeated here.

[0059] In some embodiments, Figure 5 Fig. 2 shows a flowchart of a method for detecting a corrosion defect according to an exemplary embodiment of the present application. As shown in Fig. 2, Figure 5 As shown, the method for detecting the corrosion defect includes:

[0060] Step 510: determining the target ultrasonic probe and the coupling agent based on the corrosion defect parameters of the target workpiece and the workpiece parameters, the frequency range of the target ultrasonic probe being 7.5 MHz-20 MHz, and the wafer diameter of the target ultrasonic probe being 3 mm-13 mm. For example, the frequency range of the target ultrasonic probe can be 7.5 MHz, 15 MHz, and 20 MHz, and the like, without being limited thereto. The wafer diameter of the target ultrasonic probe can be 3 mm, 7 mm, and 13 mm, and the like, without being limited thereto.

[0061] In one embodiment, the frequency range and the wafer diameter of the target ultrasonic probe described above can be determined according to the detection quality requirement of the target workpiece, that is, the frequency range and the wafer diameter of the target ultrasonic probe are related to the detection quality requirement of the target workpiece. When the workpiece parameters further include the target workpiece detection quality requirement, when the target workpiece detection quality requirement longitudinal resolution is 0.5 mm, the frequency range of the target ultrasonic probe is 7.5 MHz-12 MHz, and the wafer diameter of the target ultrasonic probe is 6 mm-13 mm; when the target workpiece detection quality requirement longitudinal resolution is 0.2 mm, the frequency range of the target ultrasonic probe is 15 MHz-20 MHz, and the wafer diameter of the target ultrasonic probe is 3 mm-6 mm. The coupling agent is selected according to the material application, the required coupling agent viscosity, and the like.

[0062] Since the corrosion defect of the aero-engine sensitive part (such as a blade and a casing) directly affects the service safety, the requirement for detection accuracy has scene dependence. For the key area (such as a blade tenon) bearing high stress, a small difference (0.2 mm) in corrosion depth may cause a sudden increase in stress concentration coefficient, and a 0.2 mm level longitudinal resolution is required; for the large-area corrosion (such as the outer surface of the casing) of the non-key area, a 0.5 mm level resolution has met the safety evaluation requirement. Therefore, by matching the frequency range and the wafer diameter of the target ultrasonic probe with the detection quality requirement (horizontal and longitudinal resolution requirement) of the target workpiece, the precise matching of the detection requirement and the probe performance can be realized, the probe performance is ensured to neither be excessive (such as using a 20 MHz probe to detect deep corrosion with only a 0.5 mm resolution, resulting in insufficient penetration), nor be insufficient (such as using a 7.5 MHz probe to detect shallow pitting with a 0.2 mm resolution, resulting in missed detection), the balance between detection efficiency and accuracy is achieved, the reliability of the aero-engine sensitive part detection is improved, the high safety requirement is met, and this targeted design avoids the detection risk caused by the one-size-fits-all selection of a general probe, ensuring that different safety level areas can obtain detection data matching their requirements, and providing reliable basis for the service evaluation of the parts.

[0063] Meanwhile, in the conventional ultrasonic detection, the probe parameter selection depends on the experience of the operator (such as selecting the probe according to the approximate depth, the defect type, etc. by experience), and the detection results are inconsistent due to the difference in human judgment. Through the above matching relationship, the application forms a standardized selection logic, and the operator can quickly determine the probe parameter without complex experience, reduces human error, improves detection consistency, simplifies the detection process, and reduces the operation threshold.

[0064] Finally, the application overcomes the detection difficulty of ultrasonic detection of surface defects, solves the problem of insufficient detection sensitivity of traditional ultrasonic detection of surface / near-surface corrosion defects with a depth of <1mm through the above matching relationship, and realizes the detectability of shallow layer micro-defects. For example, for shallow layer defects (such as pitting corrosion with a depth of 0.1-0.5mm at the leading edge of the blade) requiring 0.2mm longitudinal resolution, a 15MHz-20MHz high-frequency probe is used, which can greatly shorten the surface blind area (the theoretical blind area can be reduced to below 0.1mm), ensure the separation of near-surface defect reflection signals and transmission pulses, and avoid signal flooding; combined with a small crystal with a diameter of 3mm-6mm, the near-field length of the small crystal probe is short, the focusing of the sound beam in the near-surface area is stronger, and the energy distribution is more uniform, thereby reducing the defect omission caused by near-field interference and improving the sensitivity of ultrasonic detection of surface defects. The ultrasonic detection method of the application can distinguish the slight difference in the depth of the corrosion defect, and avoid the misjudgment of the excessive defect as a qualified defect.

[0065] Step 520: Based on the corrosion defect parameters and the workpiece parameters of the target workpiece, determine the target corrosion defect test block and the transverse and longitudinal resolution test block as the target ultrasonic test block from the plurality of corrosion defect test blocks, and the defect type of the target corrosion defect test block is consistent with the defect type of the target workpiece.

[0066] In actual application, a plurality of target corrosion defect test blocks can be determined from the plurality of corrosion defect test blocks according to the corrosion defect type, the corrosion defect position and the thickness of the target workpiece. It should be understood that the target corrosion test block can include corrosion test blocks of the same defect type, or corrosion test blocks of different defect types. For example, when the corrosion defect of the target workpiece includes a large flat bottom corrosion defect and a flat bottom hole corrosion defect, the target corrosion test block can include a plurality of large flat bottom corrosion test blocks and a plurality of flat bottom hole corrosion test blocks.

[0067] In some embodiments, Figure 6 A flowchart three of a corrosion defect detection method according to an exemplary embodiment of the application is shown. As shown in Figure 6 As shown, the above calibration of the target ultrasonic detection equipment by using the target ultrasonic test block further includes:

[0068] Step 610: Determine the correction corrosion defect test block based on the corrosion defect parameters of the target workpiece and the workpiece parameters in the target corrosion defect test block. The correction corrosion defect test block includes at least two of the target corrosion defect test blocks. The selection of the correction corrosion defect test block is based on the thickness of the target workpiece at the corrosion defect position being consistent or close to the thickness of the target corrosion test block.

[0069] Step 620: Use the correction corrosion defect test block to correct the sound velocity and zero position of the target ultrasonic detection equipment. It should be noted here that when the correction corrosion defect test block includes corrosion test blocks of different defect types, the target ultrasonic detection equipment can be corrected in sequence according to the defect types.

[0070] Step 630: Use the lateral and longitudinal resolution test block to correct the lateral and longitudinal resolution of the target ultrasonic detection equipment. For example, when the lateral and longitudinal resolution test block is a test block with three groups of flat-bottom hole defects, one of the groups can be selected for correction according to the quality requirements of the target workpiece.

[0071] In some embodiments, Figure 7 A flowchart of a method for detecting corrosion defects according to an exemplary embodiment of the present application is shown Figure Four As shown in Figure 7 the above, the target ultrasonic test block includes different types of corrosion defect test blocks and the target workpiece are detected using the corrected target ultrasonic detection equipment to obtain a plurality of test block detection results and target workpiece detection results, including:

[0072] Step 710: Use the corrected target ultrasonic detection equipment to detect each of the plurality of corrosion defect test blocks in the target ultrasonic test block to obtain a plurality of test block detection results. For example, when the target ultrasonic test block includes only one type of a plurality of corrosion defect test blocks, the same type of a plurality of corrosion defect test blocks determined according to the corrosion type of the target workpiece can be detected in sequence using the corrected target ultrasonic detection equipment to obtain a plurality of test block detection results (gain value and depth).

[0073] Step 720: Adjust the parameters of the target ultrasonic detection equipment based on the plurality of test block detection results. At this time, the plurality of test block detection results can be compared with the actual parameters of each test block to further adjust the sensitivity and range parameters of the target ultrasonic detection equipment, improve the detection accuracy of the target ultrasonic detection equipment, and ensure that the target ultrasonic detection equipment can be applied in the detection field of sensitive parts of an aero-engine.

[0074] Step 730: detecting the target workpiece by using the corrected target ultrasonic detection device to obtain a target workpiece detection result. It should be understood that the corrected target ultrasonic detection device here can refer to the target ultrasonic detection device after adjustment in step 720. It should be noted that the detection results involved in the present application are all adjusted to 80% wave height.

[0075] In some embodiments, Figure 8 A flowchart of a method for detecting corrosion defects is shown according to an exemplary embodiment of the present application Figure Five As shown in Figure 8 Based on the multiple test block detection results and the target workpiece detection result, the equivalent corrosion defect of the target test block is determined, which includes:

[0076] Step 810: Based on the multiple test block detection results and the target workpiece detection result, the equivalent corrosion defect of the target test block is determined.

[0077] Step 820: Based on the equivalent corrosion defect of the target test block, the equivalent corrosion defect of the target workpiece is determined. For example, the target workpiece detection result can be compared with the multiple test block detection results to determine the defect depth and gain value that are the same as or similar to the target workpiece detection result from the multiple test block detection results. If there is a same one, the equivalent of the test block is taken as the equivalent of the target workpiece. If there is a similar one, the average of the two is selected, which is the equivalent of the target workpiece.

[0078] In some embodiments, Figure 9 A flowchart of a method for detecting corrosion defects is shown according to an exemplary embodiment of the present application Figure Six As shown in Figure 9 Based on the multiple test block detection results and the target workpiece detection result, the equivalent corrosion defect of the target test block is determined, which further includes:

[0079] Step 910: One or more target test block detection results that meet the screening condition are determined from the multiple test block detection results, and the screening condition is that the difference between the target test block detection result and the target workpiece detection result is less than a preset difference threshold. It should be understood that the preset difference threshold here can be set according to actual conditions, which is not limited here.

[0080] Step 920: Based on the target test block detection result, the equivalent corrosion defect of the target test block corresponding to the target test block detection result is determined.

[0081] Step 930: Based on the equivalent corrosion defect of the target test block, the equivalent corrosion defect of the target workpiece is determined.

[0082] In some embodiments, Figure 10 A flowchart of a method for detecting corrosion defects is shown according to an exemplary embodiment of the present applicationFigure Seven As shown in Figure 10 The above method further comprises:

[0083] Step 101: When the correction condition is met, the target ultrasonic testing device is used to detect a plurality of corrosion defect test blocks in the target ultrasonic test block to obtain a detection result. It should be understood that the correction condition here can be that the detection time is greater than a detection time threshold or that the ultrasonic testing device is restarted. The detection time threshold can be designed according to actual conditions, which is not limited here. When the plurality of corrosion defect test blocks in the target ultrasonic test block are detected, a part of the plurality of corrosion defects can be selected for detection, or each of the plurality of corrosion defect test blocks can be detected, which is not limited here.

[0084] Step 102: If the detection result does not match the corrosion defect equivalent of the corresponding target ultrasonic test block, the target ultrasonic test block is used to correct the target ultrasonic testing device. It should be understood that the correspondence here means that the target ultrasonic test block and the detection result of the target ultrasonic test block are one-to-one. When the corrosion defect equivalent of the target ultrasonic test block is known, if the detection result does not match the corrosion defect equivalent of the target ultrasonic test block, it is considered that the ultrasonic testing device detection result is inaccurate, and steps 430-450 can be repeated to complete the detection of the target workpiece. By means of periodic correction, the use error is eliminated, and the situation of missing detection of small differences is avoided.

[0085] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0086] The above is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An ultrasonic test block for corrosion defects, characterized in that, The method comprises the following steps: a plurality of corrosion defect test blocks and a transverse and longitudinal resolution test block, the plurality of corrosion defect test blocks are of different corrosion defect types, and the plurality of corrosion defect test blocks comprise a plurality of large flat bottom corrosion defect test blocks and a plurality of flat hole corrosion defect test blocks; the corrosion defect types of the plurality of corrosion defect test blocks are determined according to the corrosion defect types of a target workpiece, the corrosion defect test blocks of the same corrosion defect type comprise a plurality of corrosion defect test blocks of different equivalents, and the corrosion defect test blocks of the same corrosion defect type are used for correcting an ultrasonic detection device; and the equivalent of the target workpiece is determined based on the ultrasonic detection results of the ultrasonic detection device on the corrosion defect test blocks of the same corrosion defect type and the target workpiece. The transverse and longitudinal resolution test block comprises a plurality of groups of corrosion defects with different depth differences, and is used for correcting the detection accuracy of the ultrasonic detection device in the transverse and longitudinal directions; the depth difference of the plurality of groups of corrosion defects included in the transverse and longitudinal resolution test block is 0.2 mm-0.5 mm; each group of corrosion defects comprises two flat holes with different depths; the diameter of each flat hole is 0.4 mm; and the center-to-center distance between adjacent two flat holes is 2 mm.

2. The ultrasonic test block of corrosion defects according to claim 1, characterized in that, The depth difference of the plurality of corrosion defect test blocks of different equivalents of the same defect type is 0.5 mm; the defect depth of the plurality of corrosion defect test blocks of different equivalents of the same defect type is 5 mm; and / or The material and surface roughness of the plurality of corrosion defect test blocks of different equivalents of the same defect type are the same as those of the target workpiece; and / or The material and surface roughness of the transverse and longitudinal resolution test block are the same as those of the target workpiece.

3. The ultrasonic test block of corrosion defects according to claim 1, characterized in that, The plurality of large flat bottom corrosion defect test blocks comprise large flat bottom defects with a diameter of 10 mm; The plurality of flat hole corrosion defect test blocks comprise flat hole defects with a diameter of 0.4 mm-1.0 mm.

4. A method of detecting corrosion defects, characterized by, The method comprises the following steps: acquiring corrosion defect parameters and workpiece parameters of a target workpiece, the corrosion defect parameters comprising a corrosion defect type, a corrosion defect position and a corrosion defect morphology, and the workpiece parameters comprising a thickness and a diameter of the target workpiece; determining a target ultrasonic detection device and a target ultrasonic test block based on the corrosion defect parameters and the workpiece parameters of the target workpiece, the target ultrasonic test block being a plurality of corrosion defect test blocks and a transverse and longitudinal resolution test block in the ultrasonic test block of the corrosion defect according to any one of claims 1-3; correcting the target ultrasonic detection device by using the target ultrasonic test block; detecting the plurality of corrosion defect test blocks in the target ultrasonic test block and the target workpiece by using the corrected target ultrasonic detection device, to obtain a plurality of test block detection results and a target workpiece detection result; determining a corrosion defect equivalent of the target workpiece based on the plurality of test block detection results and the target workpiece detection result.

5. The method of claim 4, wherein the step of detecting the corrosion defect is performed by using a method selected from the group consisting of a magnetic flux leakage method, a magnetic particle method, an eddy current method, a guided wave method, and a combination thereof. The method of determining the target ultrasonic detection device and the target ultrasonic test block based on the corrosion defect parameters and the workpiece parameters of the target workpiece comprises the following steps: determine a target ultrasonic probe and a coupling agent based on the corrosion defect parameter of the target workpiece and the workpiece parameter, the target ultrasonic probe having a frequency range of 7.5 MHz-20 MHz, and a wafer diameter of 3 mm-13 mm; determine a target corrosion defect test block and the target ultrasonic test block as the target corrosion defect test block based on the corrosion defect parameter of the target workpiece and the workpiece parameter, the target corrosion defect test block having a defect type consistent with that of the target workpiece.

6. The method of claim 5, wherein the step of detecting the corrosion defect is performed by using a method selected from the group consisting of a magnetic flux leakage method, a magnetic particle method, an eddy current method, a guided wave method, and a combination thereof. When the target workpiece detection quality requirement has a longitudinal resolution of 0.5 mm, the target ultrasonic probe has a frequency range of 7.5 MHz-12 MHz, and a wafer diameter of 6 mm-13 mm. When the target workpiece detection quality requirement has a longitudinal resolution of 0.2 mm, the target ultrasonic probe has a frequency range of 15 MHz-20 MHz, and a wafer diameter of 3 mm-6 mm.

7. The method of claim 5, wherein the step of detecting the corrosion defect is characterized by, The calibration of the target ultrasonic detection equipment using the target ultrasonic test block includes: determine a calibration corrosion defect test block based on the corrosion defect parameter of the target workpiece and the workpiece parameter in the target corrosion defect test block, the calibration corrosion defect test block including at least two of the target corrosion defect test blocks; perform speed correction and zero correction of the target ultrasonic detection equipment using the calibration corrosion defect test block; perform lateral resolution and longitudinal resolution correction of the target ultrasonic detection equipment using the lateral and longitudinal resolution test block.

8. The method of claim 4, wherein the step of detecting the corrosion defect is characterized by, The detection of different types of corrosion defect test blocks in the target ultrasonic test block and the target workpiece using the calibrated target ultrasonic detection equipment to obtain a plurality of test block detection results and target workpiece detection results includes: detect each of the plurality of corrosion defect test blocks in the target ultrasonic test block using the calibrated target ultrasonic detection equipment to obtain a plurality of test block detection results; adjust the parameters of the target ultrasonic detection equipment based on the plurality of test block detection results; detect the target workpiece using the calibrated target ultrasonic detection equipment to obtain the target workpiece detection result.

9. The method of claim 4, wherein the step of detecting the corrosion defect is characterized by, The determination of the corrosion defect equivalent of the target workpiece based on the plurality of test block detection results and the target workpiece detection result includes: determine the corrosion defect equivalent of the target test block based on the plurality of test block detection results and the target workpiece detection result; determine the corrosion defect equivalent of the target workpiece based on the equivalent of the target test block.

10. The method of claim 9, wherein the step of detecting the corrosion defect is characterized by, The determination of the corrosion defect equivalent of the target test block based on the plurality of test block detection results and the target workpiece detection result includes: determine one or more of the plurality of test block detection results that meet a screening condition as target test block detection results, the screening condition being that the difference between the target test block detection result and the target workpiece detection result is less than a preset difference threshold; determine the corrosion defect equivalent of the target workpiece based on the corrosion defect equivalent of the target test block. The method further comprises:

11. The method of claim 4, wherein the method comprises: when the correction condition is met, detecting a plurality of corrosion defect test blocks in the target ultrasonic test block by using the target ultrasonic detection device to obtain a detection result; if the detection result does not match the corrosion defect equivalent corresponding to the target ultrasonic test block, correcting the target ultrasonic detection device by using the target ultrasonic test block. ​

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