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Use of X-ray Diffraction Using Gaussian Curve Method for Measuring Plastic Strain of Steels

Published online by Cambridge University Press:  06 March 2019

Masanori Kurita  and
Kenzo Chiaki
Masanori Kurita
Affiliation:
Nagaoka University of Technology Nagaoka, 940-21 Japan
Kenzo Chiaki
Affiliation:
Nikon Co. Shinagawa-ku, Tokyo, 140 Japan
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Abstract

Plastic deformation of metals will broaden the x-ray diffraction line. The diffraction line around its peak can he approximated by a Gaussian function. The broadness of the diffraction line can be evaluated by the standard deviation, called Gaussian curve parameter (GCP), of a Gaussian function approximating the diffraction peak. Plastic strains applied to mild steels by simple and combined tension, compression, and tortion were correlated with GCP. Two kinds of GCP's were determined; the one, GCP α', was determined from the diffraction line corrected for the background counts, and the other, GCP α, was from the line uncorrected for the background, The GCP α' can be obtained from the GCP α as

α' = 0.936α + 0.011

This equation shows that the background subtraction can be omitted in determining GCP. The equivalent plastic strain ɛeq can be evaluated from the GCP a as

ɛeq - 0.000108 x 103.97α

This x-ray method allows rapid measurement of complex plastic strain without touching specimens.

Type
XII. Analysis of Stress and Fracture by Diffraction Methods
Information
Advances in X-Ray Analysis , Volume 34: Thirty-Ninth Annual Conference on Applications of X-ray Analysis, July 30 - August 3, 1990 , 1990 , pp. 633 - 642
Copyright
Copyright © International Centre for Diffraction Data 1990

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