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일방향 응고된 Co기 초내열합금 FSX-414의 응고속도에 따른 응고조직 및 편석 거동
이현정 ( Hyun Jung Lee ),이재현 ( Je Hyun Lee ),서성문 ( Seong Moon Seo ),조창용 ( Chang Young Jo ),권석환 ( Seok Hwan Gwon ),장병문 ( Byeong Moon Chang ) 대한금속재료학회 ( 구 대한금속학회 ) 2009 대한금속·재료학회지 Vol.47 No.7
Co base superalloys have been widely used for the parts of gas turbine due to their excellent strength, thermal fatigue, oxidation resistance and weldability at high temperature. In this study, directional solidifications were carried out at various solidification rates, including 0.5~300 μm/s in the Co base superalloy FSX-414. The cellular interface were formed at a low solidification rate, 1 μm/s, and the dendritic interface was found at higher solidification rates, 5~300 μm/s. As the spacing of dendrite structure decreased, the size and spacing of eutectics decreased. Dendrite arm spacing decreased with increasing solidification rates and temperature gradient. It was interesting to find the M23C6 eutectic microstructure formed between γ dendrites. Composition analysis showed that Cr and W were segregated severely between the dendrites, which resulted in the formation of Cr-rich M23C6 and W-rich MC carbides.
CM247LC 초내열합금에서 일방향응고 스타트 블록의 초기 핵생성 조건에 따른 결정립 성장
윤혜영 ( Hye Young Yoon ),이재현 ( Je Hyun Lee ),정형민 ( Hyeong Min Jung ),서성문 ( Seong Moon Seo ),조창용 ( Chang Young Jo ),권석환 ( Seok Hwan Gwon ),장병문 ( Byeong Moon Chang ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.1
The grain size and growth direction of a directionally solidified turbine blade were evaluated by the initial nucleation condition at the start block of directional solidification. The initial nucleation condition was controlled by inserting a Ni foil on the directional solidification plate of the directional solidification furnace. Fine grains with good orientation were obtained in the faster cooling condition at the start block. The nucleus number was compared with the cooling rate of the start block by electron back scattered diffraction (EBSD). DSC (differential scanning calorimeter) analysis was performed to compare the melting point and undercooling for nucleation of the coarse nuclei and fine nuclei of the start block. The faster cooling condition at the start block showed more undercooling for nucleation and smaller size of nuclei which resulted in a fine grain with good orientation in the directional turbine blade.