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Retained Austenite Stabilization Through Solute Partitioning During Intercritical Annealing in C-, Mn-, Al-, Si-, and Cr-Alloyed Steels

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Abstract

Retained austenite fractions, predicted to be stable at room temperature assuming ortho-equilibrium solute distribution during intercritical annealing, were calculated for “medium-Mn” steels with varying Mn, C, Al, Si, and Cr additions using SSOL 2 and TCFE 7 Thermo-Calc® databases. While Mn additions increase retained austenite levels, increased C levels are not predicted to greatly impact austenite fractions. Additions of Si reduce the levels, whereas opposing trends are predicted for Al additions by the employed Thermo-Calc® databases. Chromium significantly reduces the dependence of retained austenite fraction on annealing temperature. Alloying effects are explained through four critical phase transformation temperatures.

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The authors gratefully acknowledge the support of the sponsors of the Advanced Steel Processing and Products Research Center, an industry/university cooperative research center at the Colorado School of Mines.

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Authors and Affiliations

  1. Advanced Steel Processing and Products Research Center, Colorado School of Mines, Golden, CO, 80401, USA

    Singon Kang (Research Associate), Emmanuel De Moor (Assistant Professor) & John G. Speer (John Henry Moore Distinguished Professor of Metallurgical and Materials Engineering)

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  1. Singon Kang
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  2. Emmanuel De Moor
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  3. John G. Speer
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Correspondence to Emmanuel De Moor.

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Manuscript submitted September 13, 2014.

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Kang, S., De Moor, E. & Speer, J.G. Retained Austenite Stabilization Through Solute Partitioning During Intercritical Annealing in C-, Mn-, Al-, Si-, and Cr-Alloyed Steels. Metall Mater Trans A 46, 1005–1011 (2015). https://doi.org/10.1007/s11661-014-2708-0

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