IN 738LC 합금의 미세조직 열화와 물성의 상관성 연구

유정훈; 주성욱; 신기삼; 허성강; 이재현; 김의현; 정진성; 장성호; 송기욱; 하정수; Junghoon Yoo; Sungwook Jo; Keesam Shin; Sungkang Hur; Je-Hyun Lee; Eui-Hyun Kim; Jine-sung Jung; Sungho Chang; Geewook Song; Jeongsoo Ha

Korean Journal of Materials Research, Vol.14, No.1, 28-34, January, 2004

DOI10.3740/MRSK.2004.14.1.028 Export Citation

IN 738LC 합금의 미세조직 열화와 물성의 상관성 연구

Correlation of the Microstructural Degradation and Mechanical Properties of IN 738LC

유정훈¹, 주성욱¹, 신기삼^{1, 2, †}, 허성강^{1, 2}, 이재현 ^{1, 2}, 김의현³, 정진성³, 장성호³, 송기욱³, 하정수³

¹창원대학교 재료공학과
²창원대학교 금속재료공학과
³한전 전력연구원 발전연구실

Junghoon Yoo¹, Sungwook Jo¹, Keesam Shin^{1, 2, †}, Sungkang Hur^{1, 2}, Je-Hyun Lee^{1, 2}, Eui-Hyun Kim³, Jine-sung Jung³, Sungho Chang³, Geewook Song³, and Jeongsoo Ha³

¹Department of Materials Science and Engineering, Changwon National University, Korea
²Dept. of Metallurgy and Materials Science, Changwon National University, Changwon, 641-773, Korea
³Center for Power Generation Research, Korea Electric Power Research Institute, Taejon, 305-380, Korea

E-mail:

IN 738LC, the major material for gas-turbine for power generation, was heat treated at 750 ? C , 850 ? C , 950 ? C for 1000, 2000, and 4000 hrs and the microstructural evolution and mechanical properties were examined using optical microscope, XRD, SEM/EDS. The results showed γ ', the main strengthening elements in this alloy, was about 300 nm in size and was about 56% by area fraction in as-cast samples. The area fraction of γ ' peaked at 2000 hours at 750 ? C . The average diameter of the γ ' which was about 300 nm at ascast specimen increased to about 1 μm after heat treatment at 950 ? C for 4000 hrs. Carbides were formed at dendrite, cell or grain boundaries which was ascribed to the segregation caused by solute redistribution during solidification. It was found that MC type carbides formed at low temperature, whereas carbides of M 23 / C 6 / type formed at higher temperature or at longer degradation. The hardness and impact energy decreased as the heat treatment temperature or time of retention increased, which was inaccrodance with the area fraction of γ '.

Keywords:IN 738LC;superalloy;microstructure;impact strength

[References]

Chen K, Zhao LR, Tse JS, Acta Materialia, 51, 1079 (2003)
Ma S, Rangaswamy P, Majumdar BS, Scripta Materialia, 48, 525 (2003)
Roth SV, Burghammer M, Gilles R, Mukherji D, Rosler J, Strunz R, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, vol 200, 255 (2003) (2003)
Zhang H, Wang T, Wang C, Han B, Yan S, Zhao W, Han Y, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, vol. 197, Issues 1-2, 83 (2002) (2002)
Chen J, Lee JH, Jo CY, Choe SJ, Lee YT, Mater. Sci. Eng. A, 247, 113 (1998)
Penkalla HJ, Wosik J, Czyrska-Filemonowicz A, Mater. Chem. Phys., 81(2-3), 417 (2003)
Del Valle JA, Romero R, Picasso AC, Mater. Sci. Eng. A, 319-321, 643 (2001)
Choe SJ, Lee JH, Park CY, Kim HM, Advanced Performance Materials, 5, 265 (1998)
Liu L, Zhang R, Wang L, Pang S, Zhen B, J. Mater. Process. Technol., 77, 300 (1998)
Klaffke D, Carstens T, Banerji A, Wear, vol. 160, Issue 2, 361 (1993) (1993)
Zhao S, Xie X, Smith GD, Patel SJ, Mater. Sci. Eng. A, 355(1-2), 96 (2003)
Brooks CR, Heat Treatment, Structure and Properties Nonferrous Alloy, America Society for Metals, Metals Park, Ohio (1982) (1982)
Liu LR, Jin T, Zhao NR, Wang ZH, Sun XF, Guan HR, Hu ZQ, Materials Letters, In Press, Corrected Proof (2003) (2003)
John wiley & Sons, Superalloy II, A Wiley-Interscience Publication, 124 (1987) (1987)
Moshtaghin RS, Asgari S, Materials & Design, vol. 24, Issue 5, 325 (2003) (2003)

[Related Articles]

[1] Chen K, Zhao LR, Tse JS, Acta Materialia, 51, 1079 (2003)

[2] Ma S, Rangaswamy P, Majumdar BS, Scripta Materialia, 48, 525 (2003)

[3] Roth SV, Burghammer M, Gilles R, Mukherji D, Rosler J, Strunz R, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, vol 200, 255 (2003) (2003)

[4] Zhang H, Wang T, Wang C, Han B, Yan S, Zhao W, Han Y, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, vol. 197, Issues 1-2, 83 (2002) (2002)

[5] Chen J, Lee JH, Jo CY, Choe SJ, Lee YT, Mater. Sci. Eng. A, 247, 113 (1998)

[6] Penkalla HJ, Wosik J, Czyrska-Filemonowicz A, Mater. Chem. Phys., 81(2-3), 417 (2003)

[7] Del Valle JA, Romero R, Picasso AC, Mater. Sci. Eng. A, 319-321, 643 (2001)

[8] Choe SJ, Lee JH, Park CY, Kim HM, Advanced Performance Materials, 5, 265 (1998)

[9] Liu L, Zhang R, Wang L, Pang S, Zhen B, J. Mater. Process. Technol., 77, 300 (1998)

[10] Klaffke D, Carstens T, Banerji A, Wear, vol. 160, Issue 2, 361 (1993) (1993)

[11] Zhao S, Xie X, Smith GD, Patel SJ, Mater. Sci. Eng. A, 355(1-2), 96 (2003)

[12] Brooks CR, Heat Treatment, Structure and Properties Nonferrous Alloy, America Society for Metals, Metals Park, Ohio (1982) (1982)

[13] Liu LR, Jin T, Zhao NR, Wang ZH, Sun XF, Guan HR, Hu ZQ, Materials Letters, In Press, Corrected Proof (2003) (2003)

[14] John wiley & Sons, Superalloy II, A Wiley-Interscience Publication, 124 (1987) (1987)

[15] Moshtaghin RS, Asgari S, Materials & Design, vol. 24, Issue 5, 325 (2003) (2003)