ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
Regular Article
Prediction of Ar3 during Very Slow Cooling in Low Alloy Steels
Congyu ZhangZhigang YangMasato EnomotoHao ChenZenan YangChi Zhang
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2016 Volume 56 Issue 4 Pages 678-684

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Abstract

Considering the partition behavior of substitutional alloying elements, a computing method is developed to predict the starting temperature of proeutectoid ferrite transformation (Ar3) in low alloy steels during cooling. The paraequilibrium γ/(α+γ) phase boundary temperature (denoted Para Ae3) and local equilibrium partition to no-partition transition temperature are calculated using Thermo-Calc software in Fe-C-M1, Fe-C-M1-M2 and Fe-C-M1-M2-M3 (M1, M2 and M3 denote substitutional alloying elements) low alloy steels. Compared with Ar3 taken from published CCT diagrams, it is found that the transition temperature from partitioned to no-partitioned growth agrees relatively well with Ar3 when the cooling rate is less than 1°C/min.

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© 2016 by The Iron and Steel Institute of Japan
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