Ti-(42, 44)%Al 합금의 고온내산화성에 미치는 Nb, V 및 Cr의 영향

이영찬; 김미현; 김성훈; 이원욱; 백종현; 이동복; Y.C. Lee; M.H. Kim; S.H. Kim; W.W. Lee; J.H. Baek; D.B. Lee

Korean Journal of Materials Research, Vol.9, No.10, 1025-1031, October, 1999

Export Citation

Ti-(42, 44)%Al 합금의 고온내산화성에 미치는 Nb, V 및 Cr의 영향

Effect of Nb, V and Cr on the High Temperature Oxidation of Ti-(42, 44)% Al Alloys

이영찬, 김미현, 김성훈, 이원욱, 백종현¹, 이동복

성균관대학교 금속재료공학부
¹한국가스공사 연구개발원

Y.C. Lee, M.H. Kim, S.H. Kim, W.W. Lee, J.H. Baek¹, and D.B. Lee

School of Metallurgical and Materials Engineering, Sungkyunkwan University, Suwon 440-746, Korea
¹R&D Center, Korea Gas Corporation, Ansan 425-150, Korea

초록

6종류의 조성을 가진 TiAl계 합금, 즉 Ti-(42, 44)Al-2Nb-4V, Ti-(42, 44)Al-4Nb-2V 및 Ti-(42, 44)Al-4Nb-2Cr을 아크용해법으로 제조한 후, 이들의 산화성질을 조사하였다. 700, 800 및 900 ? C 의 대기 중, 50시간동안의 등온 및 반복 산화실험으로부터, 산화저항은 Ti-(42, 44)Al-2Nb-4V, Ti-(42, 44)Al-4Nb-2V 및 Ti-(42, 44)Al-4Nb-2Cr의 순으로 증가함을 알 수 있었다. 내산화성에서 V은 해로운 원소이고 Cr은 유익한 원소이었다. 산화 중 모든 모재 구성원서는 외부확산하였고 분위기중으로 부터의 산소는 내부확산하는 상호확산이 관찰되었으며, 생성되는 산화물은 최외각 TiO 2 층, 상부 ( TiO 2 +Al 2 O 3 ) 혼합층 및 하부 TiO 2 -잉여층으로 이루어진 3층 산화물구조로 구성되어 있었다.

Alloys of TiAl with six different compositions. i. e., Ti-(42, 44)Al-2Nb-4V. Ti-(42, 44)Al-4Nb-2V and Ti -(42, 44)Al-4Nb-2Cr, were manufactured by arc-melting. and their oxidation behavior was studied. Both isothermal and cyclic oxidation tests were performed at 700, 800 and 900 ? C in air for 50hr. The oxidation resistance increased in the order of Ti-(42, 44)Al-2Nb-4V, Ti-(42, 44)Al-4Nb-ZV and Ti-(42, 44)Al-4Nb-2Cr. It was found that V was a deleterious element, while Cr was a beneficial element in terms of oxidation resistance. During oxidation, a simultaneous interdiffusion was observed. All the constituent elements in the base alloys diffused outward. whereas oxygen from the atmosphere diffused inward, to form triple oxide layers composed of an outermost TiO 2 layer. upper ( TiO 2 +Al 2 O 3 ) mixed layer, and lower TiO 2 -rich layer.

[References]

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Lee DB, Park JH, Park YH, Kim YJ, Mater. Trans. JIM, 38, 306 (1997)
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[1] Kim YW, JOM, 41(7), 24 (1989)

[2] Kim YW, JOM, 46(7), 30 (1994)

[3] Becker S, Schorr M, Rahmel A, Schutze M, Oxid. Met., 38, 425 (1992)

[4] Lee DB, Park JH, Park YH, Kim YJ, Mater. Trans. JIM, 38, 306 (1997)

[5] Kim YW, Acta Metall. Mater., 40, 1121 (1992)

[6] Tsujimoto T, Hashimoto K, Nobuki M, Mater. Trans. JIM, 33, 989 (1992)

[7] Maki K, Shioda M, Sayashi M, Shimizu T, Isobe S, Mater. Sci. Eng., A153, 591 (1992)

[8] 원재훈, 김영직, 안상우, 이동복, 대한금속학회지, 36, 546 (1998)

[9] Kekare SA, Shelton DK, Aswath PB, Darolia R, et al., Structural Intermetallics, 325 (1993)

[10] Hirukawa K, Mabuchi H, Nakayama Y, Scripta Metall. Mater., 25, 1211 (1991)

[11] Rakowski JM, Pettit FS, Meier GH, Dettenwanger F, Schumann E, Ruhle M, Scripta Metall. Mater., 33, 997 (1995)

[12] Stoosnijder MF, Zheng N, Quadakkers WJ, Hofman R, Gil A, Lanza F, Oxid. Met., 46, 19 (1996)

[13] Shimizu T, Iikubo T, Isobe S, Mater. Sci. Eng., A153, 602 (1992)

[14] Larsen JM, Williams KA, Balsone SJ, Stucke MA, Whang SH(ed.), Liu CT(ed.), Pope DP(ed.), Stiegler JO(ed.), High Temperature Aluminides and Intermetallics, 521 (1990)

[15] 이동복, 대한금속학회회보, 10, 312 (1997)

[16] Brady MP, Brindley WJ, Smialek JL, Locci IE, JOM, 48(11), 46 (1996)

[17] Umakoshi Y, Yamaguchi M, Sakagami T, Yamane T, J. Mat. Sci., 24, 1599 (1989)

[18] 최송천, 조현준, 이동복, 한국표면공학회지, 26, 235 (1993)