주조용 이상스테인리스강에서 응고속도 및 질소고용도에 따른 오스테나이트 석출 거동

이종엽; 이재현; 김상식; 최병학; 김성준; 손희영; Jong Yeop Lee; Je Hyun Lee; Sang Sik Kim; Byung Hak Choi; Sung Jun Kim; Hee Young Son

Korean Journal of Materials Research, Vol.17, No.12, 654-659, December, 2007

DOI10.3740/MRSK.2007.17.12.654 Export Citation

주조용 이상스테인리스강에서 응고속도 및 질소고용도에 따른 오스테나이트 석출 거동

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

이종엽, 이재현 ^†, 김상식¹, 최병학², 김성준³, 손희영⁴

창원대학교 재료공학과
¹경상대학교 재료공학과
²강릉대학교 금속재료공학과
³한국기계연구원 재료연구소 환경재료연구부
⁴(주) KPC 소재사업부

Jong Yeop Lee, Je Hyun Lee^†, Sang Sik Kim¹, Byung Hak Choi², Sung Jun Kim³, and Hee Young Son⁴

Dept. of Materials Sci. and Eng., Changwon National University, 9 Sarim-dong, Changwon, Korea
¹Dept. of Materials Sci. and Eng., 2Gyungsang National University, 900 Gajwa-dong, Jinju, Korea
²Dept. of Metallurgy and Materials Eng., Kangnung University, 120 Univ. Road, Kangnung, Koera, Korea
³Dept. of Environmental Materials, Korea Inst. of Materials, 66 Sangnam-dong, Changwon, Korea
⁴Materials Engineering Division, KPC Ltd., 301 Gaksan-dong, Daegu, Korea

E-mail:

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, 1~100mm/s, and N and Cr contents, 0~0.27 wt.%, and 25~28 wt.% 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

[References]

Shek CH, Wong KW, Lai JL, Li DJ, Materials Sci. Eng. A, 231, 42 (1997)
Huang JH, Alstertter CJ, Metallurgical Transactions A, 26, 1079 (1995)
Park YH, Lee ZH, Materials Sci. Eng. A, 297, 78 (2001)
Simmons JW, Materials Sci. Eng. A, 207, 159 (1996)
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[Related Articles]

[1] Shek CH, Wong KW, Lai JL, Li DJ, Materials Sci. Eng. A, 231, 42 (1997)

[2] Huang JH, Alstertter CJ, Metallurgical Transactions A, 26, 1079 (1995)

[3] Park YH, Lee ZH, Materials Sci. Eng. A, 297, 78 (2001)

[4] Simmons JW, Materials Sci. Eng. A, 207, 159 (1996)

[5] Bermhardson S, Oredsson J, Martenson C, in Proceedings of ASM, Metals Congress, Duplex Austenitic-Ferritic Stainless Steels (St. Louis, Mo, USA, Oct, 1982), ed. Lula RA (ASM, Metals Park Ohio, USA, 1983) p. 267. (1983)

[6] Kim SB, Park KW, Kim YG, Materials Sci. Eng. A, 247, 67 (1996)

[7] Irvine KL, Liewellyn DT, Pickering FB, JISI, 199, 381 (1994)

[8] Wang J, Uggowitzer PJ, Magdowski R, Speidel MO, Scripta Metall. Mater., 40, 123 (1999)

[9] Kudo T, Tsuge T, Motoishi T, NACE, 45, 831 (1989)

[10] Adhe KN, Kain V, Madangopal K, Gadiyar HS, J. Mater. Eng. Performance, 5(4), 500 (1996)

[11] Joo DW, Kang CY, Sung JH, J. Kor. Inst. Met. Mater., 34, 10 (1996)

[12] Ye DH, Kim HC, Lee JH, Yoo YS, Jo CY, Korean J. Mater. Res., 12(12), 897 (2002)

[13] Kurz W, Fisher DJ, Fundamentals of Solidification 4th ed., p.83, Trans Tech Publications, Switzerland (1998). (1998)

[14] Gavriljuk VG, Berns H, High Nitrogen Steels, p. 99, Springer, Germany (1999). (1999)

[15] Poulalion A, Botte R, in Proceedings of High Nigrogen Steels 88 (Lille, France, May 1988), eds. Foct J, Hendry A (The Institute of Metals, London, England, 1989) p. 48. (1989)