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High Cyclic Fatigue Life and Fracture Behaviors of Shot-Peened Bearing Steel

쇼트피닝 처리를 한 베어링강의 고사이클 피로수명 및 파괴거동

  • Received : 2011.04.18
  • Accepted : 2011.06.03
  • Published : 2011.09.01

Abstract

Shot-peening effects on the fatigue behavior of bearing steel were investigated under the high cyclic loading. Hourglass shape specimens were made of bearing steel(JIS-SUJ2) for rotary bending fatigue tests. Two kinds of treatments were performed : a heat treatment and a shot-peened surface treatment after the heat treatment. The fracture surfaces of specimens were classified into two types of fracture mode : the surface fracture mode induced by a surface defect and the internal fracture mode induced by a nonmetallic inclusion. Inclusion depth and shape affected considerably the fatigue life. Shot-peening treatment improved much the fatigue life of the bearing steel under low and high levels of cyclic loads. Probabilistic-stress-life (P-S-N) curves were suggested for the reliable fatigue life estimation of the improved bearing steel.

Keywords

Bearing Steel;Rotary Bending Fatigue Test;Fish-eye Fatigue Fracture;Shot-peening;Probabilistic-Stress-Life Curve

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