Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 41A, Issue 6, Pages 1474-1482Publisher
SPRINGER
DOI: 10.1007/s11661-010-0181-y
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The constitutive flow behavior of sintered cobalt in the temperature range 873 to 1473 K (600 to 1200 A degrees C) and at strain rates from 0.001 to 10 s(-1) has been studied using constant true strain rate hot compression tests. On the basis of these data, a processing map has been generated that depicts the variation of strain rate sensitivity with temperature and strain rate. The processing map reveals a domain of dynamic recrystallization (DRX) with an optimum condition of processing at 1273 K (1000 A degrees C) and at 10(-3) s(-1). When deformed within the domain, the stress-strain curves exhibit a single peak followed by flow softening, leading to steady-state behavior. In addition to this, a recently developed approach based on flow curve analysis is used to study the DRX kinetics, which is found to follow an Avrami-type relation.
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