IN738LC 합금의 열간 노출 및 재생 열처리에 따른 미세조직과 응력 파단 특성의 변화

최백규; 주동원; 김인수; 장중철; 조창용; B.G. Choi; D.W. Joo; I.S. Kim; J.C. Chang; C.Y. Jo

Korean Journal of Materials Research, Vol.11, No.10, 833-840, October, 2001

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IN738LC 합금의 열간 노출 및 재생 열처리에 따른 미세조직과 응력 파단 특성의 변화

Effect of Thermal Exposure and Rejuvenation Treatment on Microstructure and Stress Rupture Properties of IN738LC

최백규 ^†, 주동원, 김인수 , 장중철¹, 조창용

한국기계연구원 내열재료그룹
¹한전전력연구원 발전연구실

B.G. Choi^†, D.W. Joo, I.S. Kim , J.C. Chang¹, and C.Y. Jo

Korea Institute of Machinery and Materials, 66 Sangnam-dong, Changwon, 641-010, Korea
¹Korea Electric Power Research Institute, 103-16 Munji-dong, Yusong-gu, Taejon 305-380, Korea

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Effects of thermal exposure and rejuvenation treatment on the microstructural evolution and the stress-rupture properties of IN738LC have been investigated. The role of precipitates on the stress- rupture properties has been analyzed through microstructural observations. Thermal exposure at 982 ? C for 1000 hours gave rise to precipitation of σ phase and coarsening of γ '. The microstructural degradation with thermal exposure at 982 ? C deteriorated stress rupture properties of the alloy. All the existing phases except MC carbides have completely dissolved into the matrix with homogenization treatment at 1200 ? C for 2 hours. Microstructure and stress-rupture properties of the thermal exposed specimens have been successfully rejuvenated by the proposed treatment.

Keywords:IN738LC;Stress rupture;Thermal exposure;Precipitation behavior;Rejuvenation

[References]

Yoshioka Y, Saito D, Fujiyama K, Okabe N, Advanced Materials and Coatings for Combustion Turbines, Proceeding of ASM 1993 Materials Congress Materials Week '93, Oct. 17-21, Pittsburgh, Pennsylvania, 53-58 (1993) (1993)
Jianting G, Ranucci D, Picco E, Strocchi PM, Metall. Mater. Trans. A, 14A, 2329 (1983)
Henderson PJ, Scripta Metall., 22, 1103 (1988)
Castillo R, Koul AK, Immarigeon JPA, in Proceedings of 6th International Symposium on Superallys (Pennsylvania, USA, September 1988). ed. Reichman et. al., (The Metallurgical Society, Pennsylvania, USA, 1988) p.805 (1988)
Mihalisin JR, Trans. AIME, 239, 180 (1967)
Ross EW, Sims CT, Superalloys II, p.97, ed. Sims CT, et. al., John Wiley & Sons, New York (1987) (1987)
Hoppin GS, Berry TF, Welding Research Supplement, November, 505-s (1970) (1970)
Keller DL, Young WR, Cost Effective Repair Techniques for Turbine Airfoils, AFWAL-TR-81-4009,1, June, (1981) (1981)
Su CY, Chou CP, Liu BC, Mat. Sci. Tech., 15, 316 (1999)
Ardell AJ, Nicholson RB, Acta Metall., 14, 1295 (1966)
Decker RF, Sims CT, The Superalloys, p.33, ed. Sims CT, Hagel WC, John Wiley & Sons, New York (1972) (1972)
Balikcl E, Raman A, Mirshams RA, Metall. Mater. Trans. A, 28A, 1993 (1997)
Sponseller DL, in Proceedings of 8th International Symposium on Superallys (Pennsylvania, USA, September 1988). ed. Kissinger et. al. (The Metallurgical Society, Pennsylvania, USA, 1996) p.259 (1996)
McLean M, Acta Metall., 33(4), 545 (1985)
Burton B, Phil. Mag. A, 43, 1 (1981)
Artz E, Ashby MF, Scripta Metall., 16, 1285 (1982)
Shewfelt RSW, Brown LM, Phil. Mag., 35, 945 (1977)
Ahlquist CN, Nix WD, Acta Metall., 19, 373 (1971)
Parker JD, Wilshire B, Met. Sci., 9, 248 (1975)
Brown LM, Ham RK, Strengthening Methods in Crystal, p.9, ed. Kelly A, Nicholson RB, Elsevier, Amsterdam (1971) (1971)
Labusch R, Schwarz RB, J. Appl. Phys., 49, 5174 (1978)

[Related Articles]

[1] Yoshioka Y, Saito D, Fujiyama K, Okabe N, Advanced Materials and Coatings for Combustion Turbines, Proceeding of ASM 1993 Materials Congress Materials Week '93, Oct. 17-21, Pittsburgh, Pennsylvania, 53-58 (1993) (1993)

[2] Jianting G, Ranucci D, Picco E, Strocchi PM, Metall. Mater. Trans. A, 14A, 2329 (1983)

[3] Henderson PJ, Scripta Metall., 22, 1103 (1988)

[4] Castillo R, Koul AK, Immarigeon JPA, in Proceedings of 6th International Symposium on Superallys (Pennsylvania, USA, September 1988). ed. Reichman et. al., (The Metallurgical Society, Pennsylvania, USA, 1988) p.805 (1988)

[5] Mihalisin JR, Trans. AIME, 239, 180 (1967)

[6] Ross EW, Sims CT, Superalloys II, p.97, ed. Sims CT, et. al., John Wiley & Sons, New York (1987) (1987)

[7] Hoppin GS, Berry TF, Welding Research Supplement, November, 505-s (1970) (1970)

[8] Keller DL, Young WR, Cost Effective Repair Techniques for Turbine Airfoils, AFWAL-TR-81-4009,1, June, (1981) (1981)

[9] Su CY, Chou CP, Liu BC, Mat. Sci. Tech., 15, 316 (1999)

[10] Ardell AJ, Nicholson RB, Acta Metall., 14, 1295 (1966)

[11] Decker RF, Sims CT, The Superalloys, p.33, ed. Sims CT, Hagel WC, John Wiley & Sons, New York (1972) (1972)

[12] Balikcl E, Raman A, Mirshams RA, Metall. Mater. Trans. A, 28A, 1993 (1997)

[13] Sponseller DL, in Proceedings of 8th International Symposium on Superallys (Pennsylvania, USA, September 1988). ed. Kissinger et. al. (The Metallurgical Society, Pennsylvania, USA, 1996) p.259 (1996)

[14] McLean M, Acta Metall., 33(4), 545 (1985)

[15] Burton B, Phil. Mag. A, 43, 1 (1981)

[16] Artz E, Ashby MF, Scripta Metall., 16, 1285 (1982)

[17] Shewfelt RSW, Brown LM, Phil. Mag., 35, 945 (1977)

[18] Ahlquist CN, Nix WD, Acta Metall., 19, 373 (1971)

[19] Parker JD, Wilshire B, Met. Sci., 9, 248 (1975)

[20] Brown LM, Ham RK, Strengthening Methods in Crystal, p.9, ed. Kelly A, Nicholson RB, Elsevier, Amsterdam (1971) (1971)

[21] Labusch R, Schwarz RB, J. Appl. Phys., 49, 5174 (1978)