GTD111M 초내열합금에서 응고속도 및 온도구배가 일방향응고 조직 에 미치는 영향

예대희; 김현철; 이재현; 유영수; 조창용; Dae-Hee Ye; Hyun-Choul Kim; Je-Hyun Lee; Young-Soo Yoo; Chang-Yong Jo

Korean Journal of Materials Research, Vol.12, No.12, 897-903, December, 2002

DOI10.3740/MRSK.2002.12.12.897 Export Citation

GTD111M 초내열합금에서 응고속도 및 온도구배가 일방향응고 조직 에 미치는 영향

The Effect of Solidification Rates and Thermal Gradients on Directionally Solidified Microstructure in the Ni-base Superalloy GTD111M

예대희, 김현철, 이재현 ^†, 유영수 ¹, 조창용 ¹

창원대학교 금속재료공학과
¹한국기계연구원 재료공정연구부

Dae-Hee Ye, Hyun-Choul Kim, Je-Hyun Lee^†, Young-Soo Yoo¹, and Chang-Yong Jo¹

Dept. of Metallurgy and materials Science,, Changwon National University, Korea
¹Dept. of Mateials Processing, Korea Institute of machinery and Materials, Korea

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Morphological evolution and growth mechanism at the solid/liquid interface during solidification were investigated in the Ni-base superalloy GTD111M by directional soldification and quenching(DSQ) technique. The experiments were conducted by changing solidification rate(V) and thermal gradient(G) which are major solidification process variables. High thermal gradient condition could be obtained by increasing the furnace temperature and closely attaching the heating and cooling zones in the Bridgeman type furnace. The dendritic/equiaxed transition was found in the G/V value lower than 0.05 \times10 3 ? C s/ mm 2 , and the planar interface of the MC- γ eutectic was found under 17 \times10 3 ? C s/ mm 2 . It was confirmed that the dendrite spacing depended on the cooling rate(GV), and the primary spacing was affected by the thermal gradient more than solidification rate. The dendrite lengths were decreased as increasing the thermal graditne, and the dendrite tip temperature was close to the liquidus temperature at 50μm /s.

Keywords:Superalloy;Directional solidification;Solidification rate;Thermal gradient;Dendrite;Equiaxed grain

[References]

Sims CT, Stoloff NS, Hagel WC, Superalloys II, John Wiley & Sons (1987) (1987)
McLean M, Directionally Solidified Materials for High Temperature Service, The Metals Society (1983) (1983)
Ahmed S, J. Metals, 24 (1990)
Khan T, Caron P, Nakagawa YG, J. Metals, 17 (1986)
Versnyder FL, Shank ME, Materials Sci. Eng, 6, 213 (1970)
Tawancy HM, Klarstrom DL, Rothman MF, J. Metals, 58 (1984)
Sprague RA, Friesen SJ, J. Metals, 24 (1986)
Hino T, Kobayashi T, Koizumi Y, Harada H, Yamagata Y, Superalloys 2000, TMS, 729 (2000)
Shilke PW, Foster AD, Pepe JJ, Beltran AM, Adv. mater. Process, 4, 22 (1992)
Sajjadi SA, Nategh S, Mat. Sci. Eng. A, 307, 158 (2001)
Sajjadi SA, Nategh S, Guthrie RIL, Mat. Sci. Eng. A, 325, 484 (2002)
Nategh S, Sajjadi SA, Mat. Sci. Eng. A, 339, 103 (2003)
Zou J, Wang HP, Doherty R, Perry EM, Antolovieh SD, et al., Superalloys 1992, TMS, 165 (1992)
Lee JH, Verhoeven JD, J. Phase Equilibria, 15(2), 136 (1994)
Kim HK, Earthman JC, Lavernia EJ, Mat. Sci. Eng. A, 152, 240 (1992)
Trivedi R, Principles of Solidification and Materials Processing (ed. Trivedi R, Sekhar JA, Mazumdar J), Trans Tech Publications (1990) (1990)
Verhoeven JD, Fundamentals of Physical Metallurgy, John Wiley &Sons (1987) (1987)

[Referenced By]

[Related Articles]

[1] Sims CT, Stoloff NS, Hagel WC, Superalloys II, John Wiley & Sons (1987) (1987)

[2] McLean M, Directionally Solidified Materials for High Temperature Service, The Metals Society (1983) (1983)

[3] Ahmed S, J. Metals, 24 (1990)

[4] Khan T, Caron P, Nakagawa YG, J. Metals, 17 (1986)

[5] Versnyder FL, Shank ME, Materials Sci. Eng, 6, 213 (1970)

[6] Tawancy HM, Klarstrom DL, Rothman MF, J. Metals, 58 (1984)

[7] Sprague RA, Friesen SJ, J. Metals, 24 (1986)

[8] Hino T, Kobayashi T, Koizumi Y, Harada H, Yamagata Y, Superalloys 2000, TMS, 729 (2000)

[9] Shilke PW, Foster AD, Pepe JJ, Beltran AM, Adv. mater. Process, 4, 22 (1992)

[10] Sajjadi SA, Nategh S, Mat. Sci. Eng. A, 307, 158 (2001)

[11] Sajjadi SA, Nategh S, Guthrie RIL, Mat. Sci. Eng. A, 325, 484 (2002)

[12] Nategh S, Sajjadi SA, Mat. Sci. Eng. A, 339, 103 (2003)

[13] Zou J, Wang HP, Doherty R, Perry EM, Antolovieh SD, et al., Superalloys 1992, TMS, 165 (1992)

[14] Lee JH, Verhoeven JD, J. Phase Equilibria, 15(2), 136 (1994)

[15] Kim HK, Earthman JC, Lavernia EJ, Mat. Sci. Eng. A, 152, 240 (1992)

[16] Trivedi R, Principles of Solidification and Materials Processing (ed. Trivedi R, Sekhar JA, Mazumdar J), Trans Tech Publications (1990) (1990)

[17] Verhoeven JD, Fundamentals of Physical Metallurgy, John Wiley &Sons (1987) (1987)