抄録
Effects of various factors on strength of both as-quenched and aged plates in Ti-6%Al-4%V alloy were systematically investigated. The solution treating temperature, chemical compositions and grain size of primary α phase were widely varied, while the aging condition was fixed at 538°C for 6hr. The equation of Oeq, for this alloy was formulated based on the multiple regression analysis between chemical compositions and strength. The α grain size dependence of strength was also evaluated. The volume fractions of primary α phase and α' martensite, their microhardness and grain size of primary α phase were quantitatively measured, and the variations in strength with various factors were analyzed by the law of mixture for strength in the two-phase microstructure consisting of the primary α phase and α' martensite.
