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Test device and method for monitoring SCC crack initiation signals based on DCPD method

A test device and test method technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of low precision and difficult monitoring, and achieve the effects of improving test accuracy, wide application range, and reducing signal fluctuations

Active Publication Date: 2021-04-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of test device and method based on DCPD method monitoring SCC crack initiation signal, solve the existing monitoring method of SCC crack initiation signal to have the defect that monitoring difficulty is big, precision is low

Method used

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  • Test device and method for monitoring SCC crack initiation signals based on DCPD method
  • Test device and method for monitoring SCC crack initiation signals based on DCPD method

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Embodiment

[0055] In this embodiment, a method for monitoring SCC crack initiation signals based on the DCPD method is applied to the monitoring of crack initiation signals of 600 alloy samples, and the specific implementation steps are as follows:

[0056] Step 1: Install the thicker sections at both ends of the 600 alloy sample 1 on the sample holder 2 through the nut 7 and the zirconia ceramic gasket 6 .

[0057] Step 2: Spot-weld the current wire 9 on both ends of the 600 alloy sample 1, spot-weld the potential wire 10 at the potential collection point of the gauge section and the reference potential collection point respectively, and then place the sample 1 with the sample holder 2 installed into the test system;

[0058] Step 3: Set the temperature of the test water environment where sample 1 is located to 350°C, the concentration of Li ions to 2ppm, the concentration of B ions to 1000ppm, and the concentration of dissolved hydrogen to DH=19.7cc H 2 / kg H 2 O, the corrosive envir...

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Abstract

The invention provides a test device and method for monitoring SCC crack initiation signals based on a DCPD method. The test device comprises a sample, a direct current power supply and a nanovoltmeter, wherein the two ends of the sample are shaft shoulder sections, and the middle section of the sample is a scale distance section; the sample is connected with a servo through a shaft shoulder section; the end parts of the two shaft shoulder sections of the sample are connected with a direct-current power supply; and two ends of the scale distance section and one of the shaft shoulder sections are connected with a nanovoltmeter. By designing the sample and introducing the reference potential, signal fluctuation caused by temperature fluctuation or material conductivity drift is remarkably reduced, and high-precision monitoring of crack initiation is completed.

Description

technical field [0001] The invention belongs to the technical field of safety analysis of nuclear power structural materials, and in particular relates to a test device and method for monitoring SCC crack initiation signals based on a DCPD method. Background technique [0002] In the field of nuclear power, the main key structural materials are in high temperature and high pressure water environment. Nuclear structural materials under stress corrosion environment are prone to crack initiation. With the increase of service time, there is a risk of further expansion of cracks, which will lead to the failure of nuclear structural materials, which will seriously threaten the safe operation of nuclear power plants. Bring catastrophic consequences to people's life safety and environmental protection. The crack initiation time of a material can directly reflect its susceptibility to stress corrosion cracking. Therefore, accurate monitoring of stress corrosion cracking (SCC) crack...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00G01N3/04G01N27/00
CPCY02E30/30
Inventor 匡文军王生凯郭朝维
Owner XI AN JIAOTONG UNIV
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