Ti-15V-3Cr-3Sn-3Al 合金の破壊靱性に及ぼす微視組織の影響

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Effect of microstructure on fracture toughness of β type Ti-15V-3Cr-3Sn-3Al alloy (Ti-15-3) was systematically examined. At 0℃, fracture toughness (δ_c) is gradually decreased as strength (0.2%PS) increased. A linear relationship is obtained between fracture toughness and strength, regardless of microstructure : morphology of precipitated α phase or β grain size. Compared with (α+β) type Ti-6Al-4V alloy (Ti-6-4), Ti-15-3 has almost the same δ_c in the strength range of 80 to 90 kgf/mm^2 and has a higher fracture toughness above the strength of 100 kgf/mm^2. The difference in fracture toughness between Ti-15-3 alloy and Ti-6-4 alloy is attributed to the difference in crack extension resistance of microcracks developed at the notch tip before unstable fracture. At -196℃, fracture toughness is linearly decreased with increasing strength, independent of microstructure. However, the decrease in fracture toughness is rather small. Contrary to the case at 0℃, Ti-15-3 had a lower fracture toughness near the strength of 150 kgf/mm^2 than that of Ti-6-4. This is because Ti-15-3 had a lower crack initiation toughness (δ_i) than Ti-6-4 at -196℃. It was found that crack initiation toughness (δ_i) of Ti-15-3 has a close relationship with reduction of area in the round bar tensile test. And crack resistance property was greatly influenced by both strength and the size of α phase precipitated during aging.
社団法人日本鉄鋼協会の論文
1990-06-01

Ti-15V-3Cr-3Sn-3Al 合金の破壊靱性に及ぼす微視組織の影響

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