High-flux micro four-point bending stress corrosion initiation test device and method

A technology of stress corrosion and four-point bending, which is applied in measuring devices, weather resistance/light resistance/corrosion resistance, instruments, etc., can solve problems such as difficulty in accurately obtaining crack initiation stress and low test efficiency

Inactive Publication Date: 2021-07-30
SOUTHWEST PETROLEUM UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the research on stress corrosion of welded joints, the overall evaluation is carried out. The samples used are generally relatively large strip-shaped samples. However, the initiation and propagation of cracks generally occur at the weld fusion interface with only micron scales. The general test method is difficult to accurately obtain the crack initiation stress, and the test efficiency is relatively low

Method used

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  • High-flux micro four-point bending stress corrosion initiation test device and method
  • High-flux micro four-point bending stress corrosion initiation test device and method
  • High-flux micro four-point bending stress corrosion initiation test device and method

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Embodiment

[0038] The design of the test device in this embodiment: the device includes a test fixture and a connecting device. In this embodiment, the size of the sample is selected as 8×4×1mm, and the sample is a welded joint of nickel-based 625 surfacing on X80 steel, and the fusion line is located in the middle of the sample, so the material of the device is selected as nickel-based 625 alloy. The test fixture consists of a loading fixture, a concave fixture, bolts, and positioning pins. The overall size of the loading fixture is 25×20×8mm, and the size of the indenter is 7×6×2.5mm. The overall size of the concave fixture is 25×20×10mm; it is in the shape of a two-step stepped groove, the bolt specification is M3.5, and the length is 15mm. Each concave fixture needs two bolts; four positioning pins are wedged into the concave fixture The corresponding positions are 4mm apart in the width direction. There are guide holes in the four corners of the loading fixture, and the diagonals ...

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Abstract

The invention provides a high-flux miniature four-point bending stress corrosion initiation test device and method and belongs to the technical field of corrosion science and corrosion prevention. The device comprises test clamps and a connecting device, wherein the test clamps play a role in supporting samples and applying loads, and the connecting device is used for connecting the test clamps and connecting the test clamps with a stretcher clamp and is matched with a nut to play a role in load transmission. The device is used for slowly applying a load to the micro sheet-shaped sample, and the corresponding relationship between the surface stress distribution of the sample and the external load is obtained through finite element numerical simulation, so the crack initiation stress can be accurately obtained. The test device is advantaged in the aspect of research on stress corrosion initiation of the micro-area represented by the fusion interface area of the metal welding joint, besides, a plurality of test clamps are connected in series on the guide rod, so a plurality of samples can be tested at the same time, test efficiency is greatly improved, and high-throughput evaluation of stress corrosion initiation is realized.

Description

technical field [0001] The invention relates to the technical field of a stress corrosion cracking test device and method, in particular to a high-throughput miniature four-point bending stress corrosion initiation test device and method. Background technique [0002] Stress corrosion is one of the main failure modes of materials in modern engineering practice. It cracks without obvious signs, so it often leads to serious accidents. Stress corrosion is a hysteresis cracking phenomenon caused by the synergistic effect of corrosive medium, sensitive material structure and stress. [0003] In many industrial fields such as oil and gas, nuclear power, etc., nickel-based alloys or stainless steel are usually used to protect low-alloy steel or carbon steel. direct contact. In addition, there is usually a large welding residual stress in the weld, which makes the welded joint more prone to stress corrosion damage. [0004] According to my country's "GBT / 15970 Corrosion Stress C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/006
Inventor 董立谨时圳演王勤英郑淮北刘庭耀刘丽
Owner SOUTHWEST PETROLEUM UNIV
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