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


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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