Observations of Material Behavior Under Isothermal and Thermo-Mechanical Loading

[+] Author and Article Information
Huseyin Sehitoglu, M. Karasek

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801

J. Eng. Mater. Technol 108(2), 192-198 (Apr 01, 1986) (7 pages) doi:10.1115/1.3225860 History: Received March 22, 1985; Online September 15, 2009


Deformation and damage behavior of a 1070 steel (class U wheel steel) under thermo-mechanical and isothermal loading have been examined. Fatigue lives under thermo-mechanical and isothermal loading were compared for similar conditions of strain and temperature. For most cases, maximum tensile stresses developed in thermo-mechanical tests exceeded those obtained under isothermal conditions (at Tmin ) for the same strain amplitude. Cyclic hardening was observed at 200 to 300°C in isothermal tests. Under thermo-mechanical loading, static strain aging resulted in added hardening due to alternate exposure of the material to high and low temperatures. When thermal recovery effects become dominant at the high temperature end, strengthening upon cooling was suppressed. Oxide scales readily formed at high temperatures (≥400°C) and resulted in an increase in damage accumulation rates. Oxygen penetration into crack flanks and the ensuing loss of carbon was identified using Auger spectroscopy. The severity of oxide penetration into the base metal increased with increase in surface crack density, longer oxidation times and higher temperatures.

Copyright © 1986 by ASME
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