IN 625 초내열합금의 응고거동 및 상변태 온도 분석 (Study on Solidification and Phase Transformation Behaviors in Ni-based Superalloy IN625)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 61권 / 4호 / 261 ~ 268페이지
· 저자명 : 함성효, 박준호, 조창용, 양승철, 주윤곤, 구지호, 이재현

초록

The solidification and phase transformation behaviors of IN625 with low C and Fe wereinvestigated through directional solidification and quenching experiments. The primary and secondarydendrite arm spacing decreased exponentially as the solidification rate increased, demonstrating goodagreement with theoretical equations. The MC carbide formed at a constant temperature gradient regardlessof the solidification rate. It is reasonable to assume that the Laves phase solidified in the final stage ofsolidification, as it was found at the bottom of the mushy zone. The morphologies and sizes of the MC carbideand the Laves phase were closely related to the solidification rate. Increasing the solidification rate at aconstant thermal gradient resulted in the development of the MC carbide from blocky to Chinese script, andeventually spotty shapes, along with decreasing size. As a result of this research, it is believed that theweldability of the alloy could be improved at the expense of mechanical properties, especially with low C andFe contents and a relatively high solidification rate, which are able to generate the finely distributed MC andLaves phase.

영어초록

The solidification and phase transformation behaviors of IN625 with low C and Fe wereinvestigated through directional solidification and quenching experiments. The primary and secondarydendrite arm spacing decreased exponentially as the solidification rate increased, demonstrating goodagreement with theoretical equations. The MC carbide formed at a constant temperature gradient regardlessof the solidification rate. It is reasonable to assume that the Laves phase solidified in the final stage ofsolidification, as it was found at the bottom of the mushy zone. The morphologies and sizes of the MC carbideand the Laves phase were closely related to the solidification rate. Increasing the solidification rate at aconstant thermal gradient resulted in the development of the MC carbide from blocky to Chinese script, andeventually spotty shapes, along with decreasing size. As a result of this research, it is believed that theweldability of the alloy could be improved at the expense of mechanical properties, especially with low C andFe contents and a relatively high solidification rate, which are able to generate the finely distributed MC andLaves phase.

참고자료

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