The influence of lattice strain on pearlite formation in Fe-C

被引：61

作者：

Steinbach, I. ^{[1
]}

Apel, M. ^{[1
]}

机构：

[1] Rhein Westfal TH Aachen, Access eV, D-52072 Aachen, Germany

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 14期

关键词：

pearlitic steels; phase transformation kinetics; phase field models;

D O I：

10.1016/j.actamat.2007.05.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of stress and strain on the transformation kinetics of pearlite is investigated by phase-field simulation. Strain is considered in terms of expansion/contraction during transformation and due to concentration gradients in austenite. It is demonstrated that due to the concentration dependence of the eigenstrain, an inhomogeneous stress distribution ahead of the transformation front enhances diffusion in the austenitic phase and reduces chemical supersaturation in both austenite and ferrite. The main result of the investigation is that transformation strain inhibits the cooperative growth mode of cementite and ferrite, as considered by the Zener-Hillert model, and provokes the salient growth of cementite needles ahead of the ferrite front, which we call "staggered growth". The predicted growth velocities give the right order of magnitude compared to the experiment and close the gap between theoretical models based on diffusion only, and experimental observations. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4817 / 4822

页数：6

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