Ti焼結体の稠密化および引張性質に及ぼすβ共析型元素添加の影響

概要

論文の詳細を見る
The effect of eutectoid β stabilizing elements of Cr, Mn, Fe, Ni, Cu, and Si on the sintering characteristics and tensile properties of Ti powder compacts was investigated, and compared with the case of Co addition carried out in a previous paper.<BR>The additional elements of Fe and Ni had the similar good effect on the densification of Ti powder compacts to the Co addition, where the sintered density ratios increased with additional amount of Fe and Ni. In the case of Si addition, the extremely high sintered density ratio of 99% was obtained for the 2 wt%Si specimen, while it decreased abruptly with increasing amount of Si for the specimens containing more than 4 wt%Si. The other specimens of Ti-X (X=Cr, Mn, Cu) also showed the decreasing tendency of sintered density ratios with increasing amount of additional elements.<BR>As the results of the tensile test concerning about Ti-2%Fe, Ti-2%Ni, Ti-2%Si and Ti-2%Co whose density ratios were more than 98%, it was confirmed that Ti-2%Fe specimen showed the highest value of tensile strength. Though the elongation value of 8% obtained for the (α+β)-quenched Ti-2%Fe specimen was much lower than 14% of the (α+β)-quenched Ti-2%Co specimen, it could be possibly improved by changing the heat treatment in (α+β)-region.
社団法人粉体粉末冶金協会の論文