개량 12Cr-1Mo강에서 탄소 함량 및 응고속도에 따른 응고 조직 형성 거동 원문

엄칠용; 이재현; 허성강; 지병하; 류석현; C. Y. Eum; J. H. Lee; S. K. Hur; B. H. Chi; S. H. Ryu

Korean Journal of Materials Research, Vol.14, No.2, 101-109, February, 2004

DOI10.3740/MRSK.2004.14.2.101 Export Citation

개량 12Cr-1Mo강에서 탄소 함량 및 응고속도에 따른 응고 조직 형성 거동 원문

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

엄칠용, 이재현 ^†, 허성강, 지병하¹, 류석현¹

창원대학교 금속재료공학과
¹두산중공업(주) 생산부문 기술연구원

C. Y. Eum, J. H. Lee^†, S. K. Hur, B. H. Chi¹, and S. H. Ryu¹

Department of Metallugy and Materials Science, Changwon National University, Korea
¹Research & Development Center Production Division, Doosan Heavey Industries & Construction Co., Ltd., Korea

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The influences of solidification rates and carbon contents on the formation of the δ -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;δ -ferrite;solidification rate;ferritic stainless steels

[References]

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[Related Articles]

[1] Dupont JN, Robino CV, Marder AR, Welding Research Supplement October 417-s (1998) (1998)

[2] Yamada M, Miyazaki M, Watanabe O, Kawai M, ASTM STP903, ASTM 59 (1986) (1986)

[3] Azuma T, Tanaka Y, Yamada H, Ishiguro T, Ikeda Y, Hajime, Yoshida, Etsuo Murai, Nobuhiko Ozaki and Toshifumi Nakajima, Japan casting & Forging Co's Technical Report, No.53, 1 (1997) (1997)

[4] Sawada S, Ohashi T, Kawaguchi S, EPRI 4 (1981) (1981)

[5] Morisada N, Kadose M, Yoshioka I, Akahori K, 10th International Forging Conference 42.1 (1985) (1985)

[6] Hull FC, Weld J., 52, 104 (1973)

[7] Thomas RC, Weld J., 57, 81 (1978)

[8] Akahori K, United State Patent 4,404,041 Sep.13. (1983) (1983)

[9] Vitek JM, Dasgupta A, David SS, Metall. Mater. Trans. A-Phys. Metall. Mater. Sci., 14A, 1833 (1983)

[10] Ryu SH, Yu J, Metall. Mater. Trans. A-Phys. Metall. Mater. Sci., 29A, 1573 (1998)

[11] Lee J, Verhoeven J, J. Cryst. Growth, 86, 193 (1994)

[12] Lee J, Verhoeven J, J. Phase Equilib., 15, 136 (1994)

[13] Trivedi R, Kurz W, Int. Mater. Rev., 39, 49 (1994)

[14] Verhoeven J: Fundamentals of physical metallurgy, ch. 9, John Wiley (1980) (1980)

[15] Kurz W, Fisher DJ: Fundamentals of Solidification, Trans Tech Publications, 63 (1992) (1992)

[16] Korea Insititute of Machinery and Materials: Study on the δ -ferrite Control in the 12%Cr Steel, Research Report (1998) (1998)

[17] Taha MA, Jacobi H, Imagumbai M, Schwerdtfeger K, Metall. Mater. Trans. A-Phys. Metall. Mater. Sci., 13A, 2131 (1982)

[18] McLean M: Directionally Solidification Material for High Temperature Service, ch. 2, The Metals Society (1983) (1983)