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http://dx.doi.org/10.3740/MRSK.2007.17.12.654

Austenite Precipitation Behaviors with Solidification Rate and N Solubility in Cast Duplex Stainless Alloys  

Lee, Jong-Yeop (Dept. of Materials Sci. and Eng., Changwon National University)
Lee, Je-Hyun (Dept. of Materials Sci. and Eng., Changwon National University)
Kim, Sang-Sik (Dept. of Materials Sci. and Eng., Gyungsang National University)
Choi, Byung-Hak (Dept. of Metallurgy and Materials Eng., Kangnung University)
Kim, Sung-Jun (Dept. of Environmental Materials, Korea Inst. of Materials)
Son, Hee-Young (Materials Engineering Division, KPC Ltd.)
Publication Information
Korean Journal of Materials Research / v.17, no.12, 2007 , pp. 654-659 More about this Journal
Abstract
Austenite precipitation behavior was studied with solidification rates and alloying contents, N and Cr, in duplex stainless steels by directional solidification. Directional solidification experiments were carried out with solidification rates, $1{\sim}100mm/s$, and N and Cr contents, $0{\sim}0.27wt.%,\;25{\sim}28wt.%$ respectively, in a duplex stainless steel, CD4MCU. As the solidification rate increases, the dendrite spacing reduced and the austenite phase in the ferrite matrix became finer. The volume fraction of austenite phase increased and its shape went to be round with increasing nitrogen contents in duplex stainless alloys. The Cr alloying element, even though it is a ferrite former, showed to enhance the nitrogen solubility in the alloy and caused the austenite round and finer. Also, Cr was supposed to decrease the austenite volume fraction, but it increased the austenite slightly due to increasing nitrogen solubility during solidification.
Keywords
Duplex stainless steel; Nitrogen; Solidification; Ferrite; Austenite;
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1 S. Bermhardson, J. Oredsson and C. Martenson, in Proceedings of ASM, Metals Congress, Duplex Austenitic-Ferritic Stainless Steels (St. Louis, Mo, USA,Oct, 1982), ed. R.A. Lula (ASM, Metals Park Ohio, USA,1983) p. 267
2 S. B. Kim, K. W. Park, and Y. G.Kim, Materials Sci. Eng.,A247, 67 (1996)   DOI   ScienceOn
3 K. L. Irvine, D. T. Liewellyn and F. B. Pickering, JISI, 199, 381 (1994)
4 J. Wang, P. J. Uggowitzer, R. Magdowski, M. O. Speidel, Scripta Metall. Mater., 40, 123 (1999)   DOI   ScienceOn
5 T. Kudo, T. Tsuge and T. Motoishi, NACE 45, 831 (1989)
6 K. N. Adhe, V. Kain, K. Madangopal and H. S. Gadiyar,J. Mater. Eng. Performance, 5(4), 500 (1996)   DOI
7 D. W. Joo, C, Y. Kang and J. H. Sung, J. Kor. Inst. Met.and Mater., 34, 10 (1996).
8 D. H. Ye, H. C. Kim, J. H. Lee, Y. S. Yoo, C. Y. Jo, Kor.J. Mater. Res., 12(12), 897 (2002)   DOI   ScienceOn
9 W. Kurz and D. J. Fisher, Fundamentals of Solidification4th ed., p.83, Trans Tech Publications, Switzerland (1998)
10 V. G. Gavriljuk and H. Berns, High Nitrogen Steels, p. 99,Springer, Germany (1999)
11 A. Poulalion and R. Botte, in Proceedings of HighNigrogen Steels 88 (Lille, France, May 1988), eds. J Foct and A Hendry (The Institute of Metals, London, England,1989) p. 48
12 C. H. Shek, K. W. Wong, J. L. Lai, and D. J. Li, MaterialsSci. Eng., A231, 42 (1997)   DOI   ScienceOn
13 J. H. Huang, C. J. Alstertter, Metallurgical Transactions A,26, 1079 (1995)   DOI
14 Y. H. Park and Z. H. Lee, Materials Sci. Eng., A297, 78(2001)   DOI   ScienceOn
15 J. W. Simmons, Materials Sci. Eng., A207, 159 (1996)   DOI   ScienceOn