Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 29-30, Pages 8565-8572Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.08.012
Keywords
Austenitic stainless steel; Hot deformation; Flow behavior; Microstructural evolution; Dynamic recrystallization
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Type 316 L(N) steel was deformed to 10%, 30% and 50% engineering strain under hot compression at strain rates of 0.1 and 1 s(-1) in the temperature range 1073-1273 K (at steps of 100 K). This paper mainly deals with two aspects: (a) to describe the flow behavior through a suitable constitutive equation and (b) to evaluate the critical condition for onset of dynamic recrystallization (DRX) through work hardening analysis and to corroborate the same with those obtained from a detailed microstructural study. The steel exhibited a strong dependence of work hardening on temperature as well as strain and the modified Zerilli Armstrong model could predict the flow stress which was reflected by a lower average absolute error (3.22%) and a higher correlation coefficient (R = 0.99) for the entire investigated hot working domain. The critical condition for the initiation of DRX was met only for the specimen deformed to 50% at 1273 K/1 s(-1). This specific condition revealed the nucleation of necklace DRX grains and was in agreement with the work hardening analysis which showed that the critical strain is achieved at true plastic strain of 0.45. (C) 2011 Elsevier B.V. All rights reserved.
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