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RESEARCH PAPERS: Additional Research Papers

Thermal-Induced Transformation of Retained Austenite in the Simulated Case of a Carburized Steel

[+] Author and Article Information
R. W. Neu, Huseyin Sehitoglu

Department of Mechanical and Industrial Engineering, University of Illinois, Urbana, Ill. 61801

J. Eng. Mater. Technol 115(1), 83-88 (Jan 01, 1993) (6 pages) doi:10.1115/1.2902161 History: Received January 04, 1992; Revised July 27, 1992; Online April 29, 2008

Abstract

Systematic experiments were conducted on carburized 4320 steel to study thermalinduced transformation of austenite to bainite by measuring the volumetric transformation strains. Up to about 210°C, thermal-induced transformation involved a diffusion-controlled reaction and therefore was time dependent. The mechanism is similar to that described by the second stage of tempering. An Arhennius-type relation was used to model the kinetics of the reaction leading to a volume increase. A positive hydrostatic stress tended to increase the rate of transformation. The anisotropy of the transformation strains were proportional to the deviatoric stress.

Copyright © 1993 by The American Society of Mechanical Engineers
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