순수 Titanium주조체의 기계적 성질에 미치는 소둔온도와 유지시간의 영향 = THE EFFECT OF ANNEALING TEMPERATURE AND HOLDING TIME ON THE MECHANICAL PROPERTIES OF PURE TITANIUM CASTINGS

다국어 초록 (Multilingual Abstract)

The effect of annealing temperature and holding time on the mechanical properties of pure titanium castings was investigated by means of microhardness test, compression test, microscopic observation, and EDS. Casting process was carried out under argon gas and the heat treatment was carried out under air. The results were as follows :
1. The mechanical properties of the specimens heat-treated at 500, 750℃ were slightly increased, but those of specimen heat-treated at 1,000℃ were remarkably increased by prolonged holding time.
2. The microstructures of specimens heat-treated at 500, 750℃ were bluntly serrated α structure, but that of specimen heat-treated at 1000℃ showed the mixture of acicular α and platelike α structures with a great number of fine precipitates.
4. The surface reaction layer was gradually thinned away by prolonged holding time at 1,000℃, Al and Si elements of the surface reaction layer were homogeneously diffused to the inside of the specimen.