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Strain rate을 고려한 크롬몰리브덴강의 고온저주기 피로특성 연구
이현우(Hyunwoo Lee),홍상혁(Sanghyuk Hong) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Isothermal fatigue characteristics of Cr-Mo heat resisting steel were investigated at high temperature. Isothermal low cycle fatigue tests at 300℃, 400℃ and 500℃ were performed with strain rates of 4×10?³/s, 4×10?⁴/s, 4×10??/s using smooth cylindrical specimens. Regardless of strain level, cyclic softening behavior was observed. The differences in fatigue lives were dependent on the magnitudes of plastic strain and total strain ranges. Plastic strain ranges were increased by increasing temperature and this plastic strain ranges together with ultimate strength can be used as the temperature compensation parameters.