PRODUCTION OF LOW ANISOTROPY AND HIGH FATIGUE STRENGTH TITANIUM BASE COMPOSITE MATERIAL

摘要

PURPOSE: To produce a titanium base composite material free from material anisotropy and having high fatigue strength at high dimensional accuracy or high shape accuracy by mixing, compacting and sintering a titanium, powder of alloy element and a specified amount of reinforcing grain and performing a specified hot working, cooling and an annealing treatment. ;CONSTITUTION: Titanium powder, powder for adding alloy elements and 3 to 30wt.% powder for adding reinforcing grains are mixed, and compacting and sintering are executed. As the powder for adding alloy elements, the powder of alloy elements or a mother alloy is used. Furthermore, as the powder for adding reinforcing grains, TiC powder, TiB₂ powder, B₄C powder or the like are suitable used. The obtd. stock is subjected to hot working at the β transformation point of the composite material matrix to 1300°C and is cooled at the cooling rate of air cooling or above. Next, this worked product is subjected to annealing treatment at 700°C to the β transformation point for 10min to 4hr.;COPYRIGHT: (C)1994,JPO