Authors: Fu, J. W.¹; Yang, Y. S.²; Guo, J. J.³; Ma, J. C.⁴; Tong, W. H.⁴

Source: Materials Science and Technology, Volume 25, Number 8, August 2009 , pp. 1013-1016(4)

Publisher: Maney Publishing

Abstract:

The microstructure evolution of near rapidly directionally solidified AISI 304 stainless steel was investigated in the present paper. It is found that the microstructure consists of δ ferrite dendrites with developed sidebranches and interdendritic austenite (γ) under the temperature gradient (G) of 20 K mm^–1 and growth rate (V) of 1·0 mm s^–1. Coupled growth microstructures of thin lamellar ferrite and austenite begin to form at a higher growth rate of 2·0 mm s^–1. The formation mechanism of the coupled microstructures is analysed based on the nucleation and constitutional undercooling criterion that the δ ferrite phase and austenite phase form alternately before the steady state growth of each phase is reached due to larger undercooling. With further increase of the growth rate up to 3·0 mm s^–1, the morphology of the δ ferrite transforms from lathy to cellular.

Keywords: DIRECTIONAL SOLIDIFICATION; MICROSTRUCTURE EVOLUTION; STAINLESS STEEL

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174328408X317093

Affiliations: 1: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 2: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;, Email: ysyang@imr.ac.cn 3: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 4: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Publication date: 2009-08-01

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