Ti-17合金の機械的性質におよぼす加工熱処理の影響

概要

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The Ti-17 alloy has been adopted for advanced jet engines fans and compressor parts, because it has a better combination of strength and toughness. However, the mechanical properties of the alloy depends strongly on process history and heat treatment condition. To improve the strength of Ti-17 alloy, the authors investigated the effect of thermomechanical treatment on mechanical properties of the alloy.Beta solution treatment brings in the precipitation of alpha phase at grain boundaries and then decreases ductility and fatigue strength.Directly aged materials, skipping solution treatment, show very good strength and fatigue endurance limit. At peak aging condition, 0.2% proof stress of direct aging material reached 1500MPa, and 107 cycle fatigue endurance limit topped 775MPa. Such improvement of mechanical properties was originated from the homogeneous dispersion of fine alpha phase.
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