Influence of volume fraction of martensite on the work hardening behaviour of two dual-phase steels with high and low silicon contents

Ashkan Nouri; Hasan Saghafian; Shahram Kheirandish

doi:10.3139/146.110405

Published by De Gruyter May 31, 2013

Influence of volume fraction of martensite on the work hardening behaviour of two dual-phase steels with high and low silicon contents

Ashkan Nouri , Hasan Saghafian and Shahram Kheirandish

From the journal International Journal of Materials Research

https://doi.org/10.3139/146.110405

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Abstract

Two low carbon steels with the same manganese content (approximately 1.6 wt.%) but different silicon contents (0.34 and 2.26 wt.%) with the initial microstructures consisting of ferrite and pearlite were intercritically annealed at five different temperatures followed by water quenching to obtain dual-phase microstructures. The modified Crussard–Jaoul analysis was employed to describe the work hardening behaviour of the dual-phase steels. Both steels exhibited two stages of work hardening in the range of plastic deformation. It is shown that for each stage the work hardening exponent is not constant and varies with volume fraction of martensite and silicon content. The dependence of the transition stress σ_k and strain ∊_k of dual-phase steels on the annealing temperature is discussed for both steels. It is concluded that ∊_k increases with increasing silicon content and decreases with annealing temperature, while the reverse is true for σ_k.

Keywords: Dual-phase steels; Silicon; Work hardening behaviour; Modified Crussard–Jaoul; Volume fraction of martensite

* Correspondence address, Dr. Hassan Saghafian Department of Metallurgy and Materials Engineering Iran University of Science and Technology Narmak, 16846-13114 Tehran, Iran Tel.: +98 21 7724 0344 Fax: +98 21 7724 0480 E-mail: saghafian@inst.ac.ir

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Received: 2009-5-24

Accepted: 2010-7-30

Published Online: 2013-05-31

Published in Print: 2010-10-01

Influence of volume fraction of martensite on the work hardening behaviour of two dual-phase steels with high and low silicon contents

Abstract

References

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