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Device and method for acquiring dynamic distribution of diffusible hydrogen under static load gradient tensile stress

A technique for diffusing hydrogen and tensile stress, applied in measuring devices, analyzing materials, and using wave/particle radiation for material analysis, etc., which can solve the problems of lack of devices and methods for the distribution of tensile stress and diffusible hydrogen

Inactive Publication Date: 2012-10-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a device and method for obtaining the dynamic distribution of diffusible hydrogen under static load gradient tensile stress, so as to solve the problem of lack of simple and intuitive device and method for obtaining the distribution of tensile stress and diffusible hydrogen

Method used

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  • Device and method for acquiring dynamic distribution of diffusible hydrogen under static load gradient tensile stress
  • Device and method for acquiring dynamic distribution of diffusible hydrogen under static load gradient tensile stress
  • Device and method for acquiring dynamic distribution of diffusible hydrogen under static load gradient tensile stress

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specific Embodiment approach 1

[0012] Specific implementation mode one: combine figure 1 To illustrate this embodiment, the device of this embodiment includes a loading bolt 1 and two loading blocks 2, each of which has a first groove 2-1 and a second groove 2-2 on the upper end surface and the lower end surface of each loading block 2, The first groove 2-1 and the second groove 2-2 are rectangular grooves, the length of the first groove 2-1 is greater than the length of the second groove 2-2, the first groove 2-1 and the second groove 2-2 Penetrating along the width direction, the loading bolt 1 passes through the loading block 2 and is threadedly connected with the loading block.

specific Embodiment approach 2

[0013] Specific implementation mode two: combination figure 1 To describe this embodiment, the surface of the first groove 2-1 in the width direction of this embodiment is an arc surface, and the advantage of this structure is to reduce stress concentration. Other implementation manners are the same as the specific implementation manner 1.

specific Embodiment approach 3

[0014] Specific implementation mode three: combination Figure 2-Figure 8 Describe this embodiment, the method of this embodiment is completed based on such a test piece, the sample 3 is made up of a first metal body 3-1, a second metal body 3-2 and a third metal body 3-3, the first metal body The cross section of 3-1 and the third metal body 3-3 is T-shaped, the cross section of the second metal body 3-2 is an isosceles trapezoid, the vertical section of the first metal body 3-1 and the second metal body 3 The lower bottom surface of -2 is connected and integrated, and the upper bottom surface of the second metal body 3-2 is integrated with the vertical section of the third metal body 3-3;

[0015] The method includes the following steps: Step 1, sample processing and loading: process the sample to be hydrogenated according to the requirements of the metallographic sample, keep the hydrogen charging surface, and seal the remaining surface with silica gel, and put the two samp...

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Abstract

The invention relates to a device and a method for acquiring the dynamic distribution of diffusible hydrogen under static load gradient tensile stress, in particular to a device and a method for acquiring the distribution of diffusible hydrogen of metal in a static load gradient tensile stress field, and aims to solve the problem that a conventional device and method for simply and visually researching the tensile stress and the distribution of diffusible hydrogen are absent. The scheme of the device is that a first groove and a second groove which are both rectangular grooves are formed on the upper end surface and the lower end surface of each loading block, the first grooves are longer than the second grooves, the grooves are through in the width direction, and loading bolts penetrate the loading blocks and are in threaded connection with the loading blocks. The scheme of the method is that sample processing and loading, stress measurement, electrochemical hydrogen charging and diffusible hydrogen collection are included. The device and the method, provided by the invention, are used for researching the dynamic distribution of diffusible hydrogen in the stress field after electrochemical hydrogen charging is performed on the metal under the static load gradient tensile stress condition.

Description

technical field [0001] The invention relates to a device and a method for obtaining the hydrogen diffusion distribution of a metal in a static load gradient tensile stress field. Background technique [0002] Under the condition of constant load (or constant displacement), the enrichment of atomic hydrogen to a critical value by stress-induced diffusion will cause the nucleation and propagation of hydrogen-induced cracks, resulting in hysteresis at low stress (even far below the yield stress) (to After a certain time) fracture phenomenon is called hydrogen-induced hysteresis fracture. Such hydrogen-induced hysteresis fracture under low stress often leads to catastrophic fracture accidents. In essence, the diffusion process of hydrogen is closely related to its chemical potential in steel. Driven by the chemical potential energy difference (ie, chemical gradient), hydrogen will diffuse from places with high chemical potential to places with low chemical potential until equil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/00
Inventor 方洪渊张敬强杨建国刘雪松董志波王佳杰王涛方坤陈双建
Owner HARBIN INST OF TECH
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