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RESEARCH PAPERS

Acoustic Emission During Athermal Martensitic Transformation in Steels

[+] Author and Article Information
Xiangying Liu, Elijah Kannatey-Asibu

Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, MI 48109

J. Eng. Ind 112(1), 84-91 (Feb 01, 1990) (8 pages) doi:10.1115/1.2899299 History: Received April 20, 1987; Revised June 08, 1989; Online April 08, 2008

Abstract

A relationship developed earlier between acoustic emission signals and the process of athermal martensitic transformation based on the free energy associated with the process is extended and verified experimentally. The relationship is found to model the process characteristics very well. The intensity of AE signal generated during transformation was found to be proportional to the temperature derivative of the fraction of martensite, the cooling rate, and volume of specimen. The AE signal was also found to be related to the carbon content of the steel. During transformation, the signal intensity was found to increase to a peak, and then tail off near the end of the transformation. Values of the martensite start temperature obtained from plots of the total RMS squared AE signals were also found to correlate well with values from the literature.

Copyright © 1990 by The American Society of Mechanical Engineers
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