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Vol.38, No.1, 78 ~ 84, 2000
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| Title |
| Pesearch Paper / Solidification : Prediction of Morphology and Size of the MC Carbide in Mar-M247LC Superalloy Castings |
| 배재식Jae Sik Bae,이재현Je Hyun Lee,서성문Seong Moon Seo,김두현Doo Hyun Kim,조창용Chang Yong Jo,최승주Seung Joo Choe |
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| Abstract |
| Morphological evolution and growth mechanism of MC carbide during solidification were investigated in a Ni-base superalloy Mar-M247LC by the directional solidification and quenching(DSQ) technique at various growth rates(0.5∼100×10^(-6)㎧). As increasing the growth rate, carbide morphology transformed from equilibrium octahedron shape to complex blocky, script, and spotty shapes. The conditions of solidification variables [rate(R) and thermal gradient(G)] to farm various shapes of the MC carbide were identified by the DSQ experiment. It was found that the carbide size decreased with increasing solidification rate and thermal gradient. The solidification criteria to form various carbide sizes applied to equiaxed castings. The solidification variables, G and R, were also estimated by the commercial casting simulation software, ProCAST, at different sections of an equiaxed modelling bar casting. Distribution of various MC carbide size could be predicted in the castings. |
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