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Dynamic Recrystallization in Sintered Cobalt during High-Temperature Deformation

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Abstract

The constitutive flow behavior of sintered cobalt in the temperature range 873 to 1473 K (600 to 1200 °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 °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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Authors and Affiliations

  1. Materials Processing Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    B. Paul, A.C. Bidaye & I.G. Sharma

  2. Mechanical Metallurgy Section, Bhabha Atomic Research Centre, Mumbai, 400085, India

    A. Sarkar, J.K. Chakravartty, A. Verma & R. Kapoor

  3. Materials Group, Bhabha Atomic Research Centre, Mumbai, 400085, India

    A.K. Suri

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  1. B. Paul
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  2. A. Sarkar
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  3. J.K. Chakravartty
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Correspondence to J.K. Chakravartty.

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Manuscript submitted August 26, 2009.

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Paul, B., Sarkar, A., Chakravartty, J. et al. Dynamic Recrystallization in Sintered Cobalt during High-Temperature Deformation. Metall Mater Trans A 41, 1474–1482 (2010). https://doi.org/10.1007/s11661-010-0181-y

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