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Ni 기 초내열합금의 급속응고조직 및 열처리 조직 (1)
윤의박,나형용,장재규,정홍철 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.1
Raipdly solidified powders of Ni-6.61%Al-3.35 %Ti-0.019%C and Ni-6.49%Al-1.98%Ti-5.34%Mo-0.028%B-0.33%Fe-0.084%C were investigated ; microstructures of the powders had been investigated at as-rapidly-solidified state and after annealing at 800℃ and 1,000℃. After rapid solidification by Ar gas atomization, the microstructure of the powder particles showed dendritic or equiaxed poly-grain morphology irrespective of the particle size. The elongated γ' phase has been precipitated next to grain boundaries in the direction perpendicular to the grain boundary, and ultrafine γ' particles were dispersed within the grains. When the alloy powders were annealed at 800℃ and 1,000℃, the elongated γ' phase had grown to an irregular shape, and the ultrafine γ' particles inside the grains had grown to a cubic shape.