RESIDUAL STRESS MEASURING METHOD

Title:

RESIDUAL STRESS MEASURING METHOD

Document Type and Number:

WIPO Patent Application WO/2019/138727

Kind Code:

A1

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 steel product 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 diffraction ring formed by the intensity distribution of the diffracted X-rays detected in the detecting step, and wherein: the irradiating step includes a step of changing the conditions for irradiating the cast or forged steel product with the X-rays; the irradiating step is a step in which the changing step is executed each time the cast or forged steel product is irradiated with the X-rays; the calculating step is a step of calculating the residual stress each time the cast or forged steel product is irradiated with the X-rays; and the method is additionally provided with an averaging step of averaging a plurality of residual stresses calculated in the calculating step, after the irradiating step, the detecting step, and the calculating step have been executed a plurality of times in this order.

Inventors:

MATSUDA MARIKO
KABUTOMORI TATSUHIKO
TAKAMATSU HIROYUKI

Application Number:

PCT/JP2018/044208

Publication Date:

July 18, 2019

Filing Date:

November 30, 2018

Export Citation:

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Assignee:

KOBE STEEL LTD (JP)

International Classes:

G01N23/2055; G01L1/25

Foreign References:

JPS6078336A	1985-05-04
JP2002181638A	2002-06-26
JP2011027550A	2011-02-10
JP2017015468A	2017-01-19
JP2016090362A	2016-05-23
CN104792808A	2015-07-22
JP2005241308A	2005-09-08

Other References: