1342 短時間2段階熱処理によるTi-6Al-4V合金の高疲労強度化(S21-6 ステンレス鋼とチタン合金の疲労,S21 金属材料の疲労特性と破壊機構)

概要

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This study was conducted to examine that the effect of the short-time duplex heat treatment on the mechanical properties and fatigue strength of Ti-6Al-4V alloy. When the alloy was solution-treated at 1203K for 60s and aged at 753-903K for 40s, a part of prior β-phase was transformed to α' martensite phase with a high hardness and subsequently fine α-phase was precipitated in the retained β-phase. This microstructure resulted in the significant improvement of the mechanical properties and the fatigue strength. Especially, in the case of the aging condition at 803K for 40s, 0.2% proof stress, tensile strength and fatigue strength were increased by 46%, 29% and 22%, respectively, while high ductility was kept.
2005-09-18