Apparatus and method for testing stress corrosion susceptibility of materials

Abstract

This invention relates to the field of materials testing technology, specifically disclosing an apparatus and test method for testing the stress corrosion sensitivity of materials. The apparatus includes a first sample holder, a second sample holder, and a liquid storage container. A sample fixing groove is provided at one end of each of the first and second sample holders facing each other. The sample fixing groove has a tapered opening, and arc-shaped tensile surfaces are provided on both sides of the tapered opening. In this invention, there is no need to machine threads or holes on the sample, avoiding stress concentration. The contact area between the arc-shaped tensile surface and the arc-shaped tensile portion is large, ensuring that sample fracture occurs in the middle of the gauge length during the test. The data more accurately reflects the true tensile strength and ductility of the material, better reflecting its intrinsic properties. The stress distribution on the sample is more uniform, avoiding the dispersion caused by holes or threads, improving data consistency, and resulting in better consistency in repeated tests.

Description

Technical Field

[0001] This invention relates to the field of materials testing technology, and specifically to an apparatus and test method for testing the stress corrosion sensitivity of materials. Background Technology

[0002] Stress corrosion refers to the damage to metallic materials caused by the combined effects of corrosive media and tensile stress. Stress corrosion is a common phenomenon in bridges, pipelines, ships, automobiles, and other fields. During service, engineering materials inevitably come into contact with corrosive media such as acids, alkalis, and salts, causing corrosion and rust, leading to premature failure. Assessing the stress corrosion sensitivity of materials and testing their tensile properties under stress corrosion conditions is beneficial for comprehensively understanding the changes in the mechanical properties of materials under stress corrosion environments, improving safety factors, and preventing problems before they occur.

[0003] Chinese invention patent CN118937048A discloses a slow tensile corrosion test fixture, testing machine, and testing method in a liquid medium. The fastening devices of the first and second clamping members are provided with internal threads, and correspondingly, the sample is provided with external threads adapted to the internal threads, thereby fixing the sample to the first and second clamping members. The first clamping member is detachably sealed to the bottom of the corrosion chamber.

[0004] The technical solution disclosed in the aforementioned Chinese invention patent CN118937048A has the following defects: (1) The two ends of the specimen are machined with external threads, and the two ends of the specimen are threadedly connected to the first clamping member and the second clamping member. The drawback of this setting is: ① Cutting at the threaded area will damage the material surface, generate residual stress or microcracks, which may weaken the overall strength of the sample; ② Stress concentration will occur at the threaded part. During the test loading, the actual force is often concentrated at the root of the thread, which can easily lead to early failure. ③ Precision thread turning is required during sample processing, especially for hard or brittle materials, which makes processing difficult, costly, and time-consuming. ④ The specimens require high dimensional accuracy. Rod-shaped specimens require thicker raw material blanks and are not suitable for plates or thin-walled materials. ⑤ The sample is difficult to assemble and disassemble with the first and second clamping parts. It needs to be screwed in and out before and after the test, which can easily wear out the threads or cause jamming, affecting the reuse of the first and second clamping parts.

[0005] (2) In addition to threaded connections, traditional connections between the specimen and the first and second clamping members typically involve machining through holes in the specimen, using bolts or pins to fix the specimen to the first and second clamping members via these holes. For example, the plate-shaped specimen clamp for stress corrosion fatigue testing disclosed in Chinese Utility Model Patent No. CN223012954U has the following drawbacks: ① The specimen has through holes, which cause severe stress concentration around the holes, resulting in a decrease in the local strength of the specimen and often becoming the fracture initiation point; ② During the test, the specimen may fail by shearing or tearing at the edge of the hole instead of tensile fracture in the gauge length. The failure mode deviates from the material's intrinsic properties, affecting the determination of the true mechanical properties. ③ The sample size is limited, and the aperture, edge distance, etc. must be strictly controlled, otherwise the results will have large deviations; ④ The gap between the bolt or pin and the through hole affects the uniformity of loading and may introduce bending or eccentric forces; ⑤ The contact and friction between the bolt or pin and the wall of the through hole can easily damage the area around the hole, increasing the scatter of the data and affecting the determination of the true mechanical properties.

[0006] (3) The first clamping component is detachably installed on the bottom of the corrosion chamber. The drawback of this method is: ①The disassembly and assembly structure between the first clamping component and the bottom of the corrosion chamber is relatively complex, resulting in low disassembly and assembly efficiency; ② An opening is made at the bottom of the corrosion chamber, and the first clamping component is installed in the opening. This installation method places very high demands on the performance of the sealing structure, and the sealing structure is relatively complex. In particular, repeated disassembly and assembly have a significant impact on the sealing reliability, resulting in a short lifespan of the test device. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an improved device and test method for testing the stress corrosion sensitivity of materials, so as to solve the corresponding defects of the existing material stress corrosion sensitivity testing devices.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an apparatus for testing the stress corrosion sensitivity of materials, comprising a first sample holder, a second sample holder, and a liquid storage container, wherein the liquid storage container is provided with a solution cavity; the liquid storage container includes a detachably sealed container base and a container body, the container base including a cylindrical base, the interior of the cylindrical base being provided with a receiving cavity, the bottom of the receiving cavity being provided with a closed cavity bottom, and further including a first connecting rod extending outward from the outside of the cavity bottom, the first sample holder extending from the inside of the cavity bottom into the receiving cavity, the cylindrical base, the cavity bottom, the first connecting rod, and the first sample holder being integrally formed; a sample fixing groove is provided at one end of the first sample holder and the second sample holder facing each other, the sample fixing groove being provided with a tapered opening, and arc-shaped stretching surfaces being provided on both sides of the tapered opening.

[0009] In a preferred embodiment, a second connecting rod is provided at the end of the second sample holder away from the sample fixing groove.

[0010] In a preferred embodiment, a first annular sealing groove is provided on the upper end surface of the cylindrical substrate, and an internal thread is provided on the accommodating cavity.

[0011] In a preferred embodiment, the container body is a cylindrical structure, and the lower end of the container body is provided with an external thread connection section adapted to the internal thread.

[0012] In a preferred embodiment, the container body has a mating surface at the root of the external threaded connection section that is adapted to and abuts against the upper end face of the cylindrical base, and a second annular sealing groove is provided on the mating surface.

[0013] In a preferred embodiment, a sample clamping block adapted to the shape of the sample fixing groove is further included.

[0014] In a preferred embodiment, the first and second sample holders are provided with fastening threaded holes near the sample fixing groove; the first and second sample holders are also provided with fastening screws adapted to the fastening threaded holes and a pressure plate for pressing the sample block, the pressure plate being provided with a through hole for accommodating the fastening screws.

[0015] The present invention also discloses a test method for testing the stress corrosion susceptibility of materials using the aforementioned apparatus, comprising at least the following steps: S10: Sample preparation; S11: Prepare a test specimen for testing. The specimen includes a specimen body, and the two ends of the specimen body are provided with specimen fixing ends adapted to the specimen fixing groove. An arc-shaped tensioning part adapted to the arc-shaped tensioning surface is formed between the specimen fixing ends and the specimen body. S12: Grind and polish the surface of the sample to remove surface defects that affect stress corrosion tensile properties; S20: Sample installation; S21: Place the sample fixing ends at both ends of the sample into the sample fixing grooves of the first sample fixing member and the second sample fixing member, respectively. S22: Place the sample block in the sample fixing groove and press it onto the sample fixing end; S23: Press the pressure plate onto the sample block, and the fastening screw passes through the through hole on the pressure plate and is threaded into the fastening thread hole; S30: Construct a liquid storage container; A sealing ring or sealant is inserted into the first and second annular sealing grooves to thread the container body and the container base together. S40: Connection mechanical testing machine; Adjust the position of the moving end of the mechanical testing machine, and connect the first connecting rod and the second connecting rod to the moving end of the mechanical testing machine respectively; S50: Creates a stress corrosion environment; Add stress corrosion medium into the solution chamber of the liquid storage container until the sample is completely submerged; S60: Stress corrosion susceptibility test; Start the mechanical testing machine, set the test parameters, and perform constant strain stress corrosion tensile testing on the stress corrosion tensile specimen at the set strain rate until the specimen breaks. S70: Experiment complete, data processing; Disconnect the first and second connecting rods from the moving end of the mechanical testing machine, drain the stress corrosion medium, remove the fractured specimen, export the stress corrosion tensile test data acquisition results, plot the strain-stress tensile curve, and analyze it.

[0016] The apparatus and test method for testing the stress corrosion sensitivity of materials of the present invention have the following advantages compared with the prior art: (1) A sample fixing groove with a tapered opening is provided on the first sample fixing member and the second sample fixing member. Correspondingly, the two ends of the sample are provided with sample fixing ends that are adapted to the sample fixing groove. The suspension connection method is formed by the gradual design of the sample width. There is no need to process threads or holes on the sample, thus avoiding stress concentration and avoiding the defects of stress concentration at the root of the thread or the edge of the hole in the prior art.

[0017] (2) The suspension connection method makes sample processing simple and avoids the extra steps of machining holes or cutting threads. It is suitable for thin plates, composite materials and other difficult or brittle materials, with a wider range of applications and a more convenient and reliable connection method.

[0018] (3) Arc-shaped tensile surfaces are provided on both sides of the tapered opening of the sample fixing groove. Correspondingly, an arc-shaped tensile part adapted to the arc-shaped tensile surface is provided on the sample. The contact area between the arc-shaped tensile surface and the arc-shaped tensile part is large. During the test, it is ensured that the sample fracture occurs in the middle of the gauge length. The data more accurately reflects the true tensile strength and ductility of the material and better reflects the intrinsic properties of the material.

[0019] (4) Based on the larger contact area between the arc-shaped tension surface and the arc-shaped tension part, the stress distribution of the sample is more uniform, avoiding the dispersion caused by holes or threads, improving data consistency, and the consistency of repeated tests is better.

[0020] (5) For materials that are sensitive to notches, such as fiber / laminate, the width transition design can better avoid early local damage and is more suitable for high-performance composite materials.

[0021] (6) Since there is no friction between the hole and the pin / bolt, and no thread wear, the service life and test efficiency of the first and second specimen fixtures are both high.

[0022] (7) The liquid storage container includes a container base and a container body with a detachable and sealed connection. The cylindrical base, cavity bottom, first connecting rod and first sample fixing piece of the container base are integrally formed. Compared with the traditional form where the first clamping piece passes through the bottom of the corrosion chamber and is detachably connected, there is no connection between the first sample fixing piece, the first connecting rod and the container base. During the test, there is no need to disassemble and assemble the first sample fixing piece and the container base, and the test efficiency is higher.

[0023] (8) Compared with the traditional first clamping part penetrating the bottom of the corrosion box and being detachably connected, the structure of the detachable connection between the container base and the container body is simpler, has higher disassembly and assembly efficiency, and has lower requirements for sealing performance. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the device for testing the stress corrosion sensitivity of materials as shown in Example 1.

[0025] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the device after the sample has been installed.

[0026] Figure 3 for Figure 1 The diagram shows a cross-sectional view of the device after the sample has been installed, taken from another direction.

[0027] Figure 4 for Figure 1 A schematic diagram of the device in its explosive state.

[0028] Figure 5This is a schematic diagram of the container base in Embodiment 1.

[0029] Figure 6 for Figure 5 The front view of the container base shown.

[0030] Figure 7 for Figure 6 The diagram shows a cross-sectional view of the container base.

[0031] Figure 8 This is a schematic diagram of the main body of the container in Example 1.

[0032] Figure 9 This is a schematic diagram of the structure of the second sample holder in Example 1.

[0033] Figure 10 This is a schematic diagram of the sample structure in Example 1.

[0034] Figure 11 This is a comparison of experimental results in a non-corrosive environment and a corrosive environment during the stress corrosion sensitivity test of copper alloy materials, as shown in Example 2.

[0035] Figure 12 This is a comparison of experimental results in a non-corrosive environment and a corrosive environment during the stress corrosion sensitivity test of stainless steel materials, as shown in Example 3, using the test method for testing the stress corrosion sensitivity of materials. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1

[0039] This embodiment provides an apparatus for testing the stress corrosion sensitivity of materials, such as... Figures 1-4 As shown, it includes a first sample holder 14, a second sample holder 30, and a liquid storage container. The liquid storage container is provided with a solution chamber 24, which is used to hold stress corrosion medium.

[0040] As a special feature of this embodiment, the liquid storage container includes a detachably sealed container base 10 and a container body 20. Wherein, as... Figures 5-7 As shown, the container base 10 includes a cylindrical base 11, the interior of which is provided with a receiving cavity 16, and the bottom of the receiving cavity 16 is provided with a closed cavity bottom 17.

[0041] As a special feature of this embodiment, a first connecting rod 13 for connecting to the moving end of the mechanical testing machine extends outward from the outside of the cavity bottom 17, and a first sample fixing member 12 for connecting the sample 40 extends into the accommodating cavity 16 from the inside of the cavity bottom 17. The first connecting rod 13 is provided with a first connecting hole 131, through which the first connecting rod 13 is connected to the moving end of the mechanical testing machine.

[0042] As described above, in this embodiment, the cylindrical base 11, the cavity bottom 17, the first connecting rod 13, and the first sample holder 12 are integrally formed. The cavity bottom 17 is the bottom of the liquid storage container. This arrangement eliminates the connection between the first sample holder 12 and the cavity bottom 17, changing the traditional through-sealed connection between the first clamping member and the bottom of the corrosion chamber. In this embodiment, the detachable connection between the container base and the container body is simpler, more efficient in assembly and disassembly, and has lower requirements for sealing performance.

[0043] In this embodiment, as Figures 5-7 , Figure 9 As shown, the first sample holder 12 and the second sample holder 30 have a sample fixing groove 14 at their opposite ends. The sample fixing groove 14 has a tapered opening 141, and arc-shaped tensile surfaces 142 are provided on both sides of the tapered opening 141. The second sample holder 30 has a second connecting rod 31 at its end away from the sample fixing groove 14. The second connecting rod 31 has a second connecting hole 32, which is used to connect to the moving end of the mechanical testing machine.

[0044] In this embodiment, as Figures 5-7 As shown, a first annular sealing groove 19 is provided on the upper end face 18 of the cylindrical base 11, and an internal thread 161 is provided on the accommodating cavity 16. Correspondingly, as Figure 8As shown, the container body 20 has a cylindrical structure, and the lower end of the container body 20 is provided with an external threaded connection section 21 that is adapted to the internal thread 161. At the root position of the external threaded connection section 21, the container body 20 is provided with a mating surface 22 that is adapted to and abuts against the upper end face 18 of the cylindrical base 11, and a second annular sealing groove 23 is provided on the mating surface 22.

[0045] In this embodiment, the container body 20 is threadedly connected to the cylindrical base 11. During connection, a sealing element, typically a sealing ring or sealant, is installed in the first annular sealing groove 19 and the second annular sealing groove 23. This embodiment of the liquid storage container features a simple structure, quick assembly and disassembly, and better sealing reliability.

[0046] As a special feature of this embodiment, such as Figures 3-4 As shown, in this embodiment, a sample clamping block 50 whose shape is adapted to the sample fixing groove 14 is also included. Figures 5-7 , Figure 9 As shown, the first sample holder 12 and the second sample holder 30 are provided with fastening threaded holes 15 near the sample fixing groove 14; they also include fastening screws 70 that are adapted to the fastening threaded holes and pressure plates 60 for pressing the sample block 50, the pressure plates 60 being provided with through holes 61 for accommodating the fastening screws. Example 2

[0047] In this embodiment, a test method for testing the stress corrosion susceptibility of copper alloy materials includes the following steps: S10: Sample preparation; In this embodiment, the sample 40 is made of copper alloy, and the preparation of the sample 40 includes the following steps: S11: Prepare sample 40 for testing. As a special feature of this embodiment, such as... Figure 10 As shown, the specimen 40 includes a specimen body 41, with specimen fixing ends 42 at both ends of the specimen body 41 that are adapted to the specimen fixing groove 14. The width of the specimen fixing ends 42 is greater than the width of the specimen body 41. Furthermore, an arc-shaped tensile portion 43, adapted to the arc-shaped tensile surface 142, is formed between the specimen fixing ends 42 and the specimen body 41. During the test, the arc-shaped tensile surface 142 and the arc-shaped tensile portion 43 are in contact to withstand tensile force.

[0048] S12: Grind and polish the surface of the sample 40 to remove surface defects that affect the stress corrosion tensile properties. Surface defects typically include cracks, holes, etc.

[0049] S20: Sample installation; Connect sample 40 to the first sample holder 12 and the second sample holder 30. Refer to the installation process... Figure 4 Specifically, it includes the following steps: S21: Place the sample fixing ends 42 at both ends of the sample into the sample fixing grooves 14 of the first sample fixing member 12 and the second sample fixing member 30 respectively, and complete the assembly of the copper alloy sample with the first sample fixing member 12 and the second sample fixing member 30.

[0050] S22: Place the sample pressing block 50 in the sample fixing groove 14 and press it on the sample fixing end 42.

[0051] S23: Press the pressure plate 60 onto the sample block 50, and the fastening screw 70 passes through the through hole 61 on the pressure plate and is threaded into the fastening threaded hole 15 to complete the fixation of the sample 40.

[0052] S30: Construct a liquid storage container; A sealing ring or sealant is inserted into the first annular sealing groove 19 and the second annular sealing groove 23, and the container body 20 and the container base 10 are threaded together to realize the construction of the liquid storage container.

[0053] S40: Connection mechanical testing machine; Adjust the position of the moving end of the mechanical testing machine, and connect the first connecting rod 13 and the second connecting rod 31 to the moving end of the mechanical testing machine through the first connecting hole 131 and the second connecting hole 32, respectively. The connection method is usually bolt connection or pin connection.

[0054] S50: Creates a stress corrosion environment; A stress corrosion medium is added to the solution chamber 24 of the storage container until the sample 40 is completely submerged, thus completing the construction of the stress corrosion environment. Preferably, in this embodiment, the stress corrosion medium is a 2 mol / L NH4Cl solution.

[0055] S60: Stress corrosion susceptibility test; Start the mechanical testing machine, set the test parameters, preload to a force of 60 N, and the mechanical testing machine at 10... -5 s -1 Stress corrosion tensile specimens were subjected to constant strain stress corrosion tensile testing at a strain rate until the specimens fractured.

[0056] S70: Experiment complete, data processing; Disconnect the first connecting rod 13 and the second connecting rod 31 from the moving end of the mechanical testing machine, drain the stress corrosion medium, remove the fractured specimen, and export the stress corrosion tensile test data acquisition results.

[0057] In the comparative test, the above test process was repeated, and the stress tensile test of copper alloy material was carried out in a non-corrosive environment. After the test, the stress tensile test data acquisition results were exported.

[0058] Based on the data collected from the comparative experiment, the following plots were drawn. Figure 11 The strain-stress tensile comparison diagram shown is used for further analysis and research. Example 3

[0059] In this embodiment, the test method for assessing the stress corrosion susceptibility of low-carbon steel materials differs from that in Embodiment 2 in that: (1) The material of sample 40 is low carbon steel; (2) The stress corrosion medium is a 3.5 wt.% NaCl solution.

[0060] (3) In step S60, start the mechanical testing machine, set the test parameters, preload to a force of 70 N, and set the mechanical testing machine to 5×10 -6 s -1 Stress corrosion tensile specimens were subjected to constant strain stress corrosion tensile testing at a strain rate until the specimens fractured.

[0061] After the test, the stress corrosion medium was drained, the fractured specimen was removed, and the stress corrosion tensile test data acquisition results were exported.

[0062] In the comparative test, the above test process was repeated, and the stress tensile test of low carbon steel was carried out in a non-corrosive environment. After the test, the stress tensile test data acquisition results were exported.

[0063] Based on the data collected from the comparative experiment, the following plots were drawn. Figure 12 The strain-stress tensile comparison diagram shown is used for further analysis and research.

[0064] In summary, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An apparatus for testing the stress corrosion sensitivity of materials, comprising a first sample holder (12), a second sample holder (30), and a liquid storage container, wherein the liquid storage container is provided with a solution chamber (24); characterized in that, The liquid storage container includes a detachably sealed container base (10) and a container body (20). The container base includes a cylindrical base (11) with a receiving cavity (16) inside. The bottom of the receiving cavity (16) is provided with a closed cavity bottom (17). It also includes a first connecting rod (13) extending outward from the outside of the cavity bottom. A first sample fixing member (12) extends from the inside of the cavity bottom into the receiving cavity. The cylindrical base, the cavity bottom, the first connecting rod, and the first sample fixing member are integrally formed. The upper end face (18) of the cylindrical base (11) is provided with a first annular sealing groove (19), and the accommodating cavity (16) is provided with an internal thread (161); the container body is a cylindrical structure, and the lower end of the container body is provided with an external thread connection section (21) adapted to the internal thread (161); the container body is provided with a mating surface (22) at the root position of the external thread connection section (21) adapted to and abutting the upper end face (18) of the cylindrical base (11), and a second annular sealing groove (23) is provided on the mating surface. The first sample holder and the second sample holder are provided with a sample fixing groove (14) at one end facing each other. The sample fixing groove (14) is provided with a tapered opening (141), and the tapered opening is provided with an arc-shaped stretching surface (142) on both sides.

2. Apparatus for testing stress corrosion susceptibility of a material according to claim 1, characterized in that The second sample holder (30) is provided with a second connecting rod (31) at the end away from the sample fixing groove.

3. Apparatus for testing stress corrosion susceptibility of a material according to claim 2, characterised in that It also includes a sample clamping block (50) whose shape is adapted to the sample fixing groove (14).

4. Apparatus for testing stress corrosion susceptibility of a material according to claim 3, characterized in that The first sample holder (12) and the second sample holder (30) are provided with fastening threaded holes (15) near the sample fixing groove (14); and also include fastening screws (70) adapted to the fastening threaded holes and pressure plates (60) for pressing the sample block (50), the pressure plates (60) being provided with through holes (61) for accommodating the fastening screws.

5. A test method for testing the stress corrosion sensitivity of a material using the apparatus of claim 4, characterized by, At least the following steps are included: S10: Sample preparation; S11: Prepare a test specimen (40) for testing. The specimen includes a specimen body (41), and the two ends of the specimen body are provided with specimen fixing ends (42) adapted to the specimen fixing groove. An arc-shaped tension part (43) adapted to the arc-shaped tension surface is formed between the specimen fixing ends and the specimen body. S12: Grind and polish the surface of the sample to remove surface defects that affect stress corrosion tensile properties; S20: Sample installation; S21: Place the sample fixing ends at both ends of the sample into the sample fixing grooves of the first sample fixing member and the second sample fixing member, respectively. S22: Place the sample block in the sample fixing groove and press it onto the sample fixing end; S23: Press the pressure plate onto the sample block, and the fastening screw passes through the through hole on the pressure plate and is threaded into the fastening thread hole; S30: Construct a liquid storage container; A sealing ring or sealant is inserted into the first and second annular sealing grooves to thread the container body and the container base together. S40: Connection mechanical testing machine; Adjust the position of the moving end of the mechanical testing machine, and connect the first connecting rod and the second connecting rod to the moving end of the mechanical testing machine respectively; S50: Creates a stress corrosion environment; Add stress corrosion medium into the solution chamber of the liquid storage container until the sample is completely submerged; S60: Stress corrosion susceptibility test; Start the mechanical testing machine, set the test parameters, and perform constant strain stress corrosion tensile testing on the stress corrosion tensile specimen at the set strain rate until the specimen breaks. S70: Experiment complete, data processing; Disconnect the first and second connecting rods from the moving end of the mechanical testing machine, drain the stress corrosion medium, remove the fractured specimen, export the stress corrosion tensile test data acquisition results, plot the strain-stress tensile curve, and analyze it.

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