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Residual stress measuring method

A technology of residual stress and measurement method, applied in the direction of measuring force, testing metal, measuring device, etc., can solve the problem of residual stress measurement result error and other problems

Inactive Publication Date: 2020-09-04
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When performing residual stress measurement using X-rays on a cast and forged steel product as the object to be inspected, if the inhomogeneous part of the cast and forged steel product is selected as the measurement location, the measurement result of the residual stress may include large error

Method used

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Experimental program
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Effect test

no. 1 approach

[0031] figure 1 The residual stress measurement method shown is a method for measuring residual stress of cast and forged steel products using X-rays, and includes: an irradiation process of irradiating X-rays to cast and forged steel products; A detection step of performing detection in the detection step, and a calculation step of calculating the residual stress based on the diffraction ring formed by the intensity distribution of the diffracted X-rays detected in the detection step. In this residual stress measurement method, when the residual stress is measured for each of a plurality of measurement positions of a cast and forged steel product, in the calculation process, the diffraction ring for each measurement position and the different X-rays for each measurement position to calculate the residual stress at each measurement position. In addition, after the detection step, the residual stress measurement method includes: a recording step of recording the intensity of t...

no. 2 approach

[0054] This residual stress measurement method is a residual stress measurement method for cast and forged steel products using X-rays, but before the test process, there is an analysis process for analyzing the properties of each measurement position of the cast and forged steel product; It is different from the residual stress measurement method of the first embodiment in that a correction coefficient determination step for determining a different correction coefficient for each measurement position is provided after the step and before the calculation step. This residual stress measurement method is the same as the residual stress measurement method of the first embodiment with respect to the irradiation process, detection process, and recording process; image 3 The shown processing is different from the residual stress measuring method of the first embodiment. Hereinafter, points different from the residual stress measuring method of the first embodiment will be described...

Embodiment approach

[0077] It should be considered that the embodiment disclosed this time is an illustration in all points and is not restrictive. The scope of the present invention is not limited to the configurations of the above-mentioned embodiments, and it is intended that all changes within the meaning and range equivalent to the claims are represented by the claims.

[0078] In the first and second embodiments described above, the calculation step is performed after the total number of times of X-ray irradiation, that is, the number of measurements, reaches a predetermined value. However, the calculation step may be performed every X-ray irradiation. That is to say, in the residual stress measurement method, when the irradiation process, the detection process, and the calculation process are performed, and the total number of measurements does not reach the specified value, the irradiation process, the detection process, and the calculation process can be performed again after changing the...

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Abstract

The present invention provides a method for measuring residual stress in a cast or forged steel product using X-rays, wherein the method is provided with a step of irradiating the cast or forged steelproduct with X-rays, a step of detecting the intensity of diffracted X-rays originating from the X-rays, in two dimensions, and a step of calculating the residual stress on the basis of a diffractionring formed by the intensity distribution of the diffracted X-rays detected in the detecting step, and wherein, when measuring the residual stress for each of a plurality of measuring positions in the cast or forged steel product, in the calculating step the residual stress at each measuring position is calculated on the basis of the diffraction ring at each measuring position and a different X-ray elastic constant at each measuring position.

Description

technical field [0001] The invention relates to a method for measuring residual stress. Background technique [0002] In recent years, techniques for measuring residual stress using X-rays have spread. This technique uses X-rays to measure lattice distortion generated inside a test object having a crystalline structure, and converts the measurement results into residual stress. [0003] The cosα method is known as a residual stress measurement method using X-rays. The cosα method is to irradiate the subject with X-rays at a specific irradiation angle, measure the intensity of the diffracted X-rays generated by the reflection of the X-rays from the subject two-dimensionally, and measure the The method of calculating the residual stress from the diffraction ring formed by the intensity distribution of the For example, Patent Document 1 describes a specific calculation procedure of the residual stress by the cos α method. [0004] In the X-ray diffraction system described i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2055G01L1/25
CPCG01L1/25G01N23/2055G01N33/204G01N2223/607G01N2223/624G01N2223/056G01N2223/1016G01N23/205
Inventor 松田真理子兜森达彦高松弘行
Owner KOBE STEEL LTD