Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 500, Issue 1-2, Pages 114-121Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.09.019
Keywords
Austenitic stainless steel; Constitutive equation; Flow stress; Compensation of temperature and strain rate
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The experimental stress-strain data from isothermal hot compression tests, in a wide range of temperatures (1123-1523 K) and strain rates (10(-3)-10(2) s(-1)), were employed to develop constitutive equations in a Ti-modified austenitic stainless steel. The effects of temperature and strain rate on deformation behaviors were represented by Zener-Holloman parameter in an exponent type equation. The influence of strain was incorporated in the constitutive analysis by considering the effect of strain on material constants. The constitutive equation (considering the compensation of strain) could precisely predict the flow stress only at 0.1 and 1 s(-1) strain rates. A modified constitutive equation (incorporating both the strain and strain rate compensation), on the other hand, could predict the flow stress throughout the entire temperatures and strain rates range except at 1123 K in 10 and 100 s(-1). The breakdown of the constitutive equation at these processing conditions is possibly due to adiabatic temperature rise during high strain rate deformation. (C)2008 Elsevier B.V. All rights reserved.
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