Microstructural Evolution in Directionally Solidified Ni-Base Superalloy IN792+Hf

材料科学技术（英文）, 2008, 24(1): 110-114.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.High Temperature Materials Research Group, KIMS, Changwon, 641-010, Korea

2.High Temperature Materials Research Group, KIMS, Changwon, 641-010, Korea

3.Dept. of Metall. & Mater. Eng., Changwon Univ., Changwon, 641-773, Korea

4.High Temperature Materials Research Group, KIMS, Changwon, 641-010, Korea

5.Dept. of Mater. Sci. & Eng., Kyushu Univ., Fukuoka, 819-0395, Japan

6.Oita National College of Technology, Oita, 870-0152, Japan

基金项目: Japan Society for the Promotion of Science through the RONPAKU fellowship National Research Laboratory Project of Korean Ministry of Science and Technology

Microstructural Evolution in Directionally Solidified Ni-Base Superalloy IN792+Hf

S.M. Seo ^1, , I.S.Kim ^2, , J.H. Lee ^3, , C.Y. Jo ^4, , H. Miyahara ^5, , K. Ogi ^6,

1.High Temperature Materials Research Group, KIMS, Changwon, 641-010, Korea

2.High Temperature Materials Research Group, KIMS, Changwon, 641-010, Korea

3.Dept. of Metall. & Mater. Eng., Changwon Univ., Changwon, 641-773, Korea

4.High Temperature Materials Research Group, KIMS, Changwon, 641-010, Korea

5.Dept. of Mater. Sci. & Eng., Kyushu Univ., Fukuoka, 819-0395, Japan

6.Oita National College of Technology, Oita, 870-0152, Japan

Keywords： IN792

Microstructural evolution during directional solidification (DS) of Ni-base superalloy IN792+Hf has been investigated with an emphasis on the γ′ precipitates and MC-type carbides. The quantitative image analyses revealed that the increase in the solidification rate up to 100μm/s at constant thermal gradient of 178 K/cm resulted in a fine and uniform distribution of γ′ precipitates. The relationship between the as-cast γ′ size and cooling rate was also determined for DS IN792+Hf. In the mean time, the MC carbide size was found to be dependent both on the solidification rate and the S/L interface morphology while the area fraction of MC carbide was significantly influenced by the S/L interface morphology.

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Microstructural Evolution in Directionally Solidified Ni-Base Superalloy IN792+Hf

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