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논문 : 기계적 성질 ; 고응력 스프링강의 열처리 변화에 따른 저주기 피로특성
김광원 ( Kwang Won Kim ),유선준 ( Sun Jun Yoo ),남원종 ( Won Jong Nam ),이종수 ( Chong Soo Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.6
In the present investigation, the low cycle fatigue(LCF) behavior of a high-strength steel heat-treated to different strength levels has been studied using the cylindrical smooth specimens under strain-controlled fully reversed pull-push condition: During the strain-controlled cycling the steel exhibits continuous softening behavior independent of the applied strain levels and heat-treatment. It has been found that the saturation of the plastic energy density per cycle(△W) proves to be a valid criterion to determine the stable hysteresis loops for establishing the cyclic stress strain(CSS) curve. The strain-life curve calculated on the basis of the CSS relationship is in good agreement with the experimental result, indicating a fine consistency between data from the CSS approach and from the strain-life approach. Then, the LCF properties are discussed with regard to their dependence on the heat treatments or strength levels of the steel investigated. Finally, the low-energy dislocation substructures during LCF have been identified using transmission electron microscopy.