OS0518 Ti-6Al-4V合金の疲労強度に及ぼす短時間熱処理および微粒子衝突の効果(OS5-4 薄膜・表面改質,OS-5 材料の疲労挙動と損傷評価2)

概要

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This study investigated the effect of short-time heat-treatment and fine-particle bombarding (FPB) on the fatigue strength of Ti-6Al-4V alloy. The slut-time heat-treatment was performed at 953 K〜1203 K for 60 s. Then, the change in the mechanical properties were investigated. The yield strength was greatly decreased by the above heal treatment conducted at 1103 K and the reduction in area was strikingly increased. On the other hand, the yield strength was increased by the heat treatment conducted at 1203 K and the reduction in area was at a higher level than that of the untreated material When the untreated material and the above heat-treated materials were further FPBed, the surface hardness was greatly increased and compressive residual stress was introduced. It was clearly observed on the fracture surfaces that the fatigue cracks of the FPBed materials were initiated from the substrates due to the existence of the hardened layers. This mutt showed that the fatigue strength of the FPBed materials were strongly controlled by the strength of the substrate. Actually, the highest fatigue strength was achieved by the heat-treatment at 1203 K and FPB because this heat treatment remarkably improved the strength of the substrate.
一般社団法人日本機械学会の論文
2011-07-16