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High Temperature Materials and Processes

Editor-in-Chief: Fukuyama, Hiroyuki

Editorial Board: Waseda, Yoshio / Fecht, Hans-Jörg / Reddy, Ramana G. / Manna, Indranil / Nakajima, Hideo / Nakamura, Takashi / Okabe, Toru / Ostrovski, Oleg / Pericleous, Koulis / Seetharaman, Seshadri / Straumal, Boris / Suzuki, Shigeru / Tanaka, Toshihiro / Terzieff, Peter / Uda, Satoshi / Urban, Knut / Baron, Michel / Besterci, Michael / Byakova, Alexandra V. / Gao, Wei / Glaeser, Andreas / Gzesik, Z. / Hosson, Jeff / Masanori, Iwase / Jacob, Kallarackel Thomas / Kipouros, Georges / Kuznezov, Fedor


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Open Access
Online
ISSN
2191-0324
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Volume 32, Issue 3

Issues

Unified Tensile Work Hardening Behaviour of Thin Section Plate and Forged Thick Section 9Cr-1Mo Ferritic Steel

B.K. Choudhary
  • Corresponding author
  • Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603 102, Tamil Nadu, India
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  • Other articles by this author:
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/ E. Isaac Samuel
  • Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603 102, Tamil Nadu, India
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/ D.P. Rao Palaparti
  • Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603 102, Tamil Nadu, India
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/ J. Christopher
  • Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603 102, Tamil Nadu, India
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/ M.D. Mathew
  • Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603 102, Tamil Nadu, India
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Published Online: 2013-06-15 | DOI: https://doi.org/10.1515/htmp-2012-0110

Abstract

Detailed investigation has been performed on tensile work hardening behaviour in terms of the variations of instantaneous work hardening rate (θ = dσ/dεp, where σ is true stress and εp is true plastic strain) with stress and true plastic strain rate (ε̇p) for temperature range 300–873 K in two different material conditions, (i) normalised and tempered plate and (ii) quenched and tempered tubeplate forging of 9Cr-1Mo ferritic steel. Both plate and tubeplate forging exhibited two-stage work hardening and three different temperature regimes in the variation of θ with σ. The variations of θ with respect to ε̇p exhibited unified work hardening in terms of a single master curve independent of temperature and initial microstructure. θ varied linearly with reciprocal of plastic strain rate, i.e. 1/ε̇p, and as a consequence, linear correlation between the rate of change of true stress and true plastic strain rate independent of temperature and microstructure has been obtained.

Keywords: 9Cr-1Mo steel; tubeplate forging; unified tensile work hardening; work hardening rate; plastic strain rate

About the article

Received: 2012-07-17

Accepted: 2012-10-19

Published Online: 2013-06-15

Published in Print: 2013-06-14


Citation Information: High Temperature Materials and Processes, Volume 32, Issue 3, Pages 287–294, ISSN (Online) 2191-0324, ISSN (Print) 0334-6455, DOI: https://doi.org/10.1515/htmp-2012-0110.

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©[2013] by Walter de Gruyter Berlin Boston.Get Permission

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