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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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References

1Brooks, J.A. and Thompson, A.W.: Microstructural development and solidification cracking susceptibility of austenitic stainless steel welds. Int. Mater. Rev. 36, 16 (1991).CrossRefGoogle Scholar
2Siegel, U., Spies, H.J., and Eckstein, H.J.: Effect of solidification conditions on the solidification sequence of austenitic chromiumnickel stainless steels. Steel Res. 57, 25 (1986).CrossRefGoogle Scholar
3Hunter, A. and Ferry, M.: Phase formation during solidification of AISI 304 austenitic stainless steel. Scr. Mater. 46, 253 (2002).CrossRefGoogle Scholar
4Rajasekhar, K., Harendranath, C.S., Raman, R., and Kulkarni, S.D.: Microstructural evolution during solidification of austenitic stainless steel weld metals: A color metallographic and electron microprobe analysis study. Mater. Charact. 38, 53 (1997).CrossRefGoogle Scholar
5Wright, R.N., Bae, J.C., Kelly, T.F., Flinn, J.E., and Korth, G.E.: The microstructure and phase relationships in rapidly solidified type 304 stainless steel powders. Metall. Trans. A 31, 2399 (1988).CrossRefGoogle Scholar
6Brooks, J.A., Williams, J.C., and Thompson, A.W.: STEM analysis of primary austenite solidified stainless steel welds. Metall. Trans. A 14, 23 (1983).CrossRefGoogle Scholar
7Suutala, N., Takalo, T., and Moisio, T.: The relationship between solidification and microstructure in austenitic and austeniticferritic stainless steel welds. Metall. Trans. A 10, 512 (1979).CrossRefGoogle Scholar
8Lippold, J.C. and Savage, W.F.: Solidification of austenitic stainless steel weldments. Part 2: The effect of alloy composition on ferrite morphology. Welding J. 59, 48s (1980).Google Scholar
9David, S.A.: Ferrite morphology and variations in ferrite content in austenitic stainless steel welds. Welding J. 60, 63s (1981).Google Scholar
10Brooks, J.A., Williams, J.C., and Thompson, A.W.: Microstructural origin of the skeletal ferrite morphology of austenitic stainless steel welds. Metall. Trans. A 14, 1271 (1983).CrossRefGoogle Scholar
11Fredriksson, H.: Solute segregation and microstructure of directionally solidified austenitic stainless steel. Metall. Trans. 3, 2989 (1972).CrossRefGoogle Scholar
12Ma, J.C., Yang, Y.S., Tong, W.H., Fang, Y., Yu, Y., and Hu, Z.Q.: Microstructural evolution in AISI 304 stainless steel during directional solidification and subsequent solid-state transformation. Mater. Sci. Eng., A 444, 64 (2007).CrossRefGoogle Scholar
13Baldissin, D., Baricco, M., and Battezzati, L.: Microstructures in rapidly solidified AISI 304 interpreted according to phase selection theory. Mater. Sci. Eng., A 449–451, 999 (2007).CrossRefGoogle Scholar
14Pryds, N.H. and Huang, X.: The effect of cooling rate on the microstructures formed during solidification of ferritic steel. Metall. Trans. A 31, 3155 (2000).CrossRefGoogle Scholar
15Schino, A.D., Mecozzi, M.G., Barteri, M., and Kenny, J.M.: Solidification mode and residual ferrite in low-Ni austenitic stainless steels. J. Mater. Sci. 35, 375 (2000).CrossRefGoogle Scholar
16Schubert, Th., Löser, W., Schinnerling, S., and Bächer, I.: Alternative phase formation in thin strip casting of stainless steels. Mater. Sci. Technol. 11, 181 (1995).CrossRefGoogle Scholar
17Fu, J.W., Yang, Y.S., Guo, J.J., and Tong, W.H.: Effect of cooling rate on solidification microstructures in AISI 304 stainless steel. Mater. Sci. Technol. 24, 941 (2008).CrossRefGoogle Scholar
18D'Souza, N., Lekstrom, M., and Dong, H.B.: An analysis of measurement of solute segregation in Ni-base superalloys using x-ray spectroscopy. Mater. Sci. Eng., A 490, 258 (2008).CrossRefGoogle Scholar
19Ferrandini, P.L., Rios, C.T., Dutra, A.T., Jaime, M.A., Mei, P.R., and Caram, R.: Solute segregation and microstructure of directionally solidified austenitic stainless steel. Mater. Sci. Eng., A 435–436, 139 (2006).CrossRefGoogle Scholar