621 高強度鋼のギガサイクル疲労 : その 1 : 超鉄鋼プロジェクトにおける位置づけ

概要

論文の詳細を見る
1500-MPa-plus class high strength steels with high resistance to delayed fracture and giga-cycle fatigue have been developed in the ultra steel project. Giga-cycle fatigue of high strength steels is dominated by internal fracture, initiated at inclusions and matrix cracks and its fatigue strength is lower than the estimated one for surface fracture from the empirical eqation σ_W=0.5σ_B, where σ_W and σ_B are fatigue and tensile strengths. Modified ausforming and controlling the size and hardeness of inclusions cleared the spring steel SUP12 withσ_B=1800 MPa of internal fracture. The fatigue strength was higher thanσ_W=0.5σ_B, even through internal fracture occurred from controlled inclusions.
一般社団法人日本機械学会の論文
2000-07-31