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Dependence of Stress Constant on Microstructure of Quenched and Tempered Steels in X-Ray Stress Measurement

Published online by Cambridge University Press:  06 March 2019

Masanori Kurita  and
Akira Saito
Masanori Kurita
Affiliation:
Nagaoka University of Technology Nagaoka, 940-21 Japan
Akira Saito
Affiliation:
Nagaoka University of Technology Nagaoka, 940-21 Japan
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Abstract

The residual stress measurement of quenched and tempered steels is of practical importance because the quenching can sometimes induce the high residual stress which affects the strength of materials. The stress constants of carbon steels quenched and tempered at various temperatures were measured in order to determine the residual stress of steels by x-ray diffraction. The stress constant increased slowly with increasing tempering temperatures below 500°C; it increased rapidly with tempering temperatures above about 500°C, This rapid increase in the stress constant is closely related to the change in microstructure of the steels in tempering; above the tempering temperature of around 500°C, the tempered martensite recrystallized and transformed to ferritic iron and fine cementite particles dispersed in the matrix; these coalesced and grew to be speroidized cementites and finally laminar cementite plates.

Type
VII. Stress Determination by Diffraction Methods
Information
Advances in X-Ray Analysis , Volume 35 , Issue A: First Pacific-International Congress on X-ray Analytical Methods (PICXAM). Fortieth Annual Conference on Applications of X-ray Analysis, August 7-16, 1991 , 1991 , pp. 519 - 525
Copyright
Copyright © International Centre for Diffraction Data 1991

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