Browse > Article
http://dx.doi.org/10.3740/MRSK.2004.14.2.101

Solidification Microstructures with Carbon Contents and Solidification Rates in Modified 12Cr-lMo Steels  

Eum C. Y (창원대학교 금속재료공학과)
Lee J. H (창원대학교 금속재료공학과)
Hur S. K (창원대학교 금속재료공학과)
Chi B. H (두산중공업(주) 생산부문 기술연구원)
Ryu S. H (두산중공업(주) 생산부문 기술연구원)
Publication Information
Korean Journal of Materials Research / v.14, no.2, 2004 , pp. 101-109 More about this Journal
Abstract
The influences of solidification rates and carbon contents on the formation of the $\delta$-ferrite were studied by directional solidification in modified 12%Cr-l %Mo steels. Directional solidification experimental results showed that solidification microstructure depended on solidification rate and carbon content and chromium equivalent. The length of the mushy zone increased and the dendrite arm spacings decreased as the solidification rate increased. The volume fraction of the 8-ferrite decreased with increasing the solidification rate and carbon content. The volume fraction of the ferrite showed much higher at low solidification rates with planar and cellular interfaces than that at high solidification rates with dendritic interface. It is expected that macro-segregation of C causes lower C content at the lower solidification fraction in the directionally solidified sample, where lower C results in higher volume fraction of the ferrite. In order to estimate solidification microstructure in modified 12Cr-l%Mo steels, various solidification conditions, such as solidification rate, cooling rate, segregation, alloy composition, should be considered.
Keywords
modified 12%Cr-l %Mo steels; directional solidification; $\delta$-ferrite; solidification rate; ferritic stainless steels.;
Citations & Related Records
연도 인용수 순위
  • Reference
1 J. Lee, J. Verhoeven, J. Crystal Growth, 86, 193 (1994)   DOI   ScienceOn
2 J. Lee, J. Verhoeven, J. phase Equilibria, 15, 136 (1994)   DOI
3 R. Trivedi and W. Kurz, International Materials Reviews. 39, 49 (1994)   DOI
4 J. Verhoeven: Fundamentals of physical metallurgy, ch. 9, John Wiley (1980)
5 W. Kurz and D. J. Fisher: Fundamentals of Solidification, Trans Tech Publications, 63 (1992)
6 Korea Insititute of Machinery and Materials: Study on the ${\delta}$-ferrite Control in the 12%Cr Steel, Research Report (1998)
7 M. A. Taha, H. Jacobi, M. Imagumbai and K. Schwerdtfeger, Met. Trans. A, 13A, 2131 (1982)
8 M. McLean: Directionally Solidification Material for High Temperature Service, ch. 2, The Metals Society (1983)
9 Tsukasa Azuma, Yasuhiko Tanaka, Hotohisa Yamada, Tohru Ishiguro, Yasumi Ikeda, Hajime, Yoshida, Etsuo Murai, Nobuhiko Ozaki and Toshifumi Nakajima, Japan casting & Forging Co's Technical Report, No.53, 1 (1997)
10 S. Sawada, T. Ohashi and S. Kawaguchi, EPRI 4 (1981)
11 Norio Morisada, Masuo Kadose, Ichiro Yoshioka and Kimihiko Akahori, 10th International Forging Conference 42.1 (1985)
12 F. C. Hull, Weld J., 52, 104 (1973)
13 R. C. Thomas, Weld J., 57, 81 (1978)
14 Masayuki Yamada, Matsuo Miyazaki, Osamu Watanabe and Mitsuo Kawai, ASTM STP903, ASTM 59 (1986)
15 Kimihico Akahori, United State Patent 4,404,041 Sep.13. (1983)
16 J. M. Vitek, A. Dasgupta and S. S. David, Met. Trans. 14A, 1833 (1983)
17 S. H. Ryu and J. Yu, Met. Trans. A, 29A, 1573 (1998)   DOI
18 J. N. Dupont, C. V. Robino and A. R. Marder, Welding Research Supplement October 417-s (1998)