Conversional model of transformation strain to phase fraction in low alloy steels

被引：71

作者：

Lee, S.-J.

Lusk, M. T.

Lee, Y.-K. ^{[1
]}

机构：

[1] Yonsei Univ, Dept Met Engn, Seoul 120749, South Korea

[2] Colorado Sch Mines, Div Engn, Mat Sci Program, Golden, CO 80404 USA

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 03期

关键词：

transformation strain; lattice parameter; austenite decomposition; dilatometric test;

D O I：

10.1016/j.actamat.2006.09.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Computational models of austenite decomposition are widely used to predict external shape and internal microstructural changes as functions of time and temperature. One modeling approach involves converting the measured transformation strain to phase fractions using the lattice parameters of parent and product phases, because the transformation strain is caused by crystal structural change and an enrichment/depletion of the solute atoms in solid solution. A conversional model of transformation strains occurring during austenite decomposition to phase fractions was developed using an optimal set of lattice parameters and thermal expansion coefficients of each phase associated with low alloy steels. The model is composed of four different transformation strain formulae for ferrite, pearlite, bainite and martensite transformations, respectively, and can be applied to continuous cooling transformations as well as isothermal ones. The conversional model demonstrated a good match between calculated and measured phase fractions of industrial low alloy steels cooled at the different rates after austenitization. (c) 2006 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

引用

页码：875 / 882

页数：8

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