발간논문

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Vol.37, No.1, 13 ~ 19, 1999
Title
Mechanical Behavior / A study on microstructural change after compressive deformation in Nickel - based single crystal superalloy
안성욱 , 진영훈 , 허무영 , 임옥동 , 서동이 , 최종수 Seong Uk An , Young Hoon Jin , Moo Young Huh , Ok Dong Lim , Dong Yi Seo , Jong Soo Choe
Abstract
Nickel-based single crystal superalloy shows directional coarsening which has been explained by the interaction of interface dislocation and composition in matrix. After compression test at 700, 800℃ and 900℃, γ` precipitates were observed on (001) and (010) planes through scanning and transmission electron microscopes. Strains of γmatrix and γ` precipitate were measured using XRD. (010)plane exhibited the increasing tendency of directional coarsening of γ precipitate with increasing temperature. Due to the interaction of dislocation and Cr, Co diffused into matrix channel perpendicular to stress axis. γ` precipitates were sheared by dislocations along the direction parallel to stress axis and showed faster rate of strain with increasing temperature compared to γmatrix, which was never seen at low stress state such as in creep test. So it was concluded that stress intensity and temperature affected microstructure of γ` precipitates.
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