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Hydrogen embrittlement evaluation method

An evaluation method, the technology of hydrogen solution, is applied in the direction of testing the strength of materials by using a single impact force and testing the strength of materials by applying a stable bending force. It can solve problems such as abnormal fracture, escape, and excessive corrosion, and achieve strong versatility. The effect of a short trial period

Inactive Publication Date: 2018-03-06
张宇
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Problems solved by technology

However, the concentration of hydrochloric acid solution used in this method is high, and the sample is prone to excessive corrosion and abnormal fracture during the hydrogen charging process, which will affect the test results.
In addition, the surface of the hydrogen-filled sample was not treated before the slow-strain tensile test, and the hydrogen in the sample may escape from the sample during the stretching process, which will also have a certain impact on the test results

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[0032] specific implementation plan

[0033] The present invention will be further described in detail below in conjunction with the examples.

[0034] Table 1 is the test parameters and results of the hydrogen embrittlement evaluation of different materials using the method of the present invention, wherein A, B and C are pipeline steels of different strength levels, D, E and F are high-strength steels, and G, H and I are low-temperature steels. Steel, the sample size is 55mm (length) × 10mm (width) × 10mm (height).

[0035] The hydrogen charging solution is dilute sulfuric acid solution with different solubility, and 0.5g / L sodium thiosulfate is added to the solution at the same time, and the concentration of sulfuric acid solution is adjusted according to the pH value.

[0036] The application method of bending stress is the three-point bending method. While applying the stress, the load sensor and the displacement sensor are used to automatically record the load and displ...

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Abstract

The invention discloses a method for evaluating hydrogen embrittlement of a material. The method comprises the following steps: processing the material to be evaluated into the size of an impact sample and preparing a notch, then placing the sample in a hydrogen charging solution for hydrogen charging, and charging the hydrogen Bending stress is applied to the sample at the same time. After the test, the sample is punched off, the impact energy of the sample is recorded and the hydrogen-induced crack length is measured, and the hydrogen embrittlement susceptibility of the material is evaluated according to the impact energy value and the stable crack growth rate. This method can evaluate the hydrogen-induced crack susceptibility of hydrogen-absorbing materials in the service environment, and provide guidance for the development of new materials and engineering material selection.

Description

technical field [0001] The invention relates to a hydrogen embrittlement evaluation method, which belongs to the field of material performance evaluation. Background technique [0002] Metal materials have the possibility of hydrogen infiltration during smelting, preparation, welding and subsequent service, and under the action of stress gradient during service, hydrogen tends to enrich in high stress areas, which significantly increases the possibility of hydrogen embrittlement of bearing structures and components Therefore, in order to use this kind of material safely and effectively, it is very important to evaluate and predict its susceptibility to hydrogen embrittlement by simulating service conditions before use. [0003] In the invention patent with the patent announcement number CN104502196A, a device and method for detecting the susceptibility to hydrogen embrittlement of the surface treatment process of high-strength steel are disclosed. Brittle sensitivity was ev...

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Application Information

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IPC IPC(8): G01N3/20G01N3/30
CPCG01N3/20G01N3/30
Inventor 张宇
Owner 张宇
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