발간논문

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Vol.43, No.12, 867 ~ 874, 2005
Title
Special Edition : Symposium on Mechanical Behavior of Materials(2) ; Microstructural Evolution and Degradation of Tensile Properties During Thermal Exposure in Ni-Base Superalloy CM247LC
최백규 Baig Gyu Choi , 김인수 In Soo Kim , 김두현 Doo Hyun Kim , 조창용 Chang Yong Jo
Abstract
Microstructural evolution and degradation of tensile properties during thermal exposure in Ni-base superalloy CM247LC have been investigated. Two different morphology of carbides, blocky MC and scriptal MC, observed in aged specimen had different compositions due to the segregation during casting process. The morphology of MC depends on its composition in aged specimen. Coarsening of γ` and decomposition of MC occurred during thermal exposure. M6C formed from scriptal MC decomposition and M23C6 formed from blocky MC near eutectic. Grain boundary had both M6C and M23C6 after MC decomposition. Strengths decreased during thermal exposure due to coarsening of gamma prime. Effect of thermal exposure on ductility is not significant at both room temperature and 760℃.
Key Words
CM247LC, Thermal Exposure, MC decomposition, Tensile properties
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