Device and method for detecting hydrogen embrittlement resistance of metal material under dynamic bending condition

A dynamic bending, metal material technology, used in measuring devices, using repetitive force/pulse force to test the strength of materials, analyzing materials, etc. , The effect of shortening the test period and short test period

Active Publication Date: 2018-09-04
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] as attached figure 1 As shown, the frame and axle are constantly subjected to dynamic bending loads during the repeated bumping of the tires. However, the existing test methods only consider the static load and quasi-static load, which is inconsistent with the actual situation.
[0007] There is a large difference between the existing static load test and the actual dynamic service environment of the parts, so it is necessary to design a device to test the hydrogen embrittlement resistance of the material during service in the dynamic load environment

Method used

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  • Device and method for detecting hydrogen embrittlement resistance of metal material under dynamic bending condition
  • Device and method for detecting hydrogen embrittlement resistance of metal material under dynamic bending condition
  • Device and method for detecting hydrogen embrittlement resistance of metal material under dynamic bending condition

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Embodiment 1

[0056] The device for detecting the hydrogen embrittlement resistance of metal materials under dynamic bending conditions of the present application is composed of a loading device and an electrochemical group, such as figure 2 , 3 shown.

[0057] The electrochemical group consists of a dielectric container 2, a reference electrode 3, a dielectric solution 7, an auxiliary electrode 8, and a potentiostat 14. The dielectric solution can be 0.5mol / L NaOH aqueous solution, and the dielectric container is made of insulating and corrosion-resistant materials. During the test, the sample is immersed in the medium solution, and a constant hydrogen charging current density is used to fill the sample with a constant hydrogen content.

[0058] The loading device is mainly composed of base plate 1, lower support 4, lower chuck 5, upper pressing block 9, upper chuck 10, connecting rod 11, guide block 12, oil cylinder 13 and other components. The lower support 4 and the upper pressing bl...

Embodiment 2

[0065] A method for testing the hydrogen embrittlement resistance of metal materials under dynamic bending conditions, including:

[0066] Step 1. Sample making

[0067] To make a plate-shaped sample, the length of the parallel working part in the middle is required to be greater than twice the thickness, the radius of the transition arc from the parallel working part of the sample to the clamping end is greater than twice the thickness, and the width of the clamping end is slightly different from the width of the 4 slots of the lower support. Small, the length of the sample shall not be less than the distance between the outer facades of the two lower supports 4. The parallelism, coaxiality and perpendicularity of the sample should be less than 5‰ of the thickness of the working section of the sample. The average surface roughness is required to be less than 0.2 μm, and there should be no obvious scratches under 20 times low magnification.

[0068] Step 2. Sample clamping ...

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Abstract

The invention discloses a device for detecting hydrogen embrittlement resistance of a metal material under a dynamic bending condition. The device comprises a loading device and an electrochemical group; both a reference electrode and a auxiliary electrode of the electrochemical group are disposed in a medium solution located in a medium container; both the reference electrode and the auxiliary electrode are connected with a potentiostat; the loading device comprises lower supporting seats; the lower supporting seats are disposed on a bottom plate; upper pressing blocks are disposed on the tops of the upper supporting seats; two ends of a test sample are fixedly mounted between the lower supporting seats and the upper pressing blocks; a upper chuck and a lower chuck are mounted on a connecting rod, respectively contact with the upper surface and the lower surface of the test sample, and are used for applying a bending load to the test sample; and the connecting rod passes through a guiding block and is connected with a piston rod of an oil cylinder. The invention further provides a method for detecting the hydrogen embrittlement resistance of the metal material under the dynamic bending condition. According to the device and the method of the invention, a material is loaded with a dynamic load during a test process; a loading condition reflects the service environment of the material more realistically, and can more objectively evaluate the hydrogen embrittlement resistance of the material; the hydrogen content is constant; and the test period is short.

Description

technical field [0001] The invention relates to a device and a method for testing the properties of metal materials, in particular to a device and a method for testing the hydrogen embrittlement resistance of metal materials under dynamic bending conditions. Background technique [0002] In recent years, with the rapid development of the automobile industry, the application of ultra-high-strength automobile steel has become more and more extensive. For example, hot-formed steel has solved the problem of stamping springback very well, so hot-formed steel has great potential for application in the automotive field, but this technology has the disadvantages of insufficient cold-bending performance and high susceptibility to hydrogen embrittlement. The delayed fracture phenomenon is a phenomenon of hydrogen-induced cracking that occurs due to the interaction of high-strength materials-environment-stress. Studies have shown that the higher the strength of the material, the great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02G01N3/36
CPCG01N3/02G01N3/36
Inventor 刘念薛欢熊飞刘冬毛新平陈勇徐进桥尹云洋
Owner 武汉钢铁有限公司
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