Ti-6Al-2Sn-4Zr-6Mo 合金の衝撃靱性に及ぼすミクロ組織因子の影響

概要

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The instrumented Charpy impact test and dynamic fracture toughness test are carried out on variously heat treated Ti-6Al-2Sn-4Zr-6Mo alloy, and the effect of microstructure on toughness under impact loading is examined. In equiaxed α structural specimens, Charpy absorbed energy (E_t) value increases with the increase of solution treatment temperature below 1123K, and then decreases with increase of solution treatment temperature above 1123K. E_t value is strongly influenced by the cooling rate after solution treatment. In equiaxed α structural specimens, the tendency of the change in dynamic fracture toughness (J_d) with solution treatment temperature is similar to that of E_t value. However, the degree of the change in J_d value and the effect of cooling rate after solution treatment on J_d value are significantly small. E_t and J_d values are remarkably large in acicular structural specimens which are furnace cooled after solution treatment in the β region. In acicular α structural specimens, E_t and J_d values increase with the increase of prior β grain size. However, in equiaxed α structural specimens, E_t value rather decreases with increase of prior β grain size although J_d value increases. E_t and J_d values increase with the increase of the roughness of fracture surface.
社団法人日本鉄鋼協会の論文
1987-08-01