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Formation of two-phase coupled microstructure in AISI 304 stainless steel during directional solidification

Published online by Cambridge University Press:  31 January 2011

J.W. Fu ,
Y.S. Yang ,
J.J. Guo ,
J.C. Ma  and
W.H. Tong
J.W. Fu
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Y.S. Yang*
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
J.J. Guo
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
W.H. Tong
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
*
a) Address all correspondence to this author. e-mail: ysyang@imr.ac.cn
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Abstract

Formation and evolution details of a two-phase coupled microstructure in AISI 304 stainless steel are studied by quenching method during directional solidification. Results show that the coupled growth microstructure, which is composed of thin lath-like ferrite (δ) and austenite (γ), crystallizes first in the form of colony from the melt. As solidification develops, the retained liquid transforms into austenite gradually. On cooling, solid-state transformation from ferrite to austenite results in the disappearance of part thinner ferrites and the final two-phase coupled microstructure is formed after the solid-state transformation. The formation mechanism of the two-phase coupled microstructure is analyzed based on the nucleation and constitutional undercooling criterion (NCU) before steady-state growth of each phase is reached.

Keywords

MicrostructurePhase transformationSteel
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 7 , July 2009 , pp. 2385 - 2390
Copyright
Copyright © Materials Research Society 2009

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