Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Fatigue Fracture Behavior of Spheroidal Graphite Cast Iron FCD500 by Super-Rapid induction Quenching

초급속열처리 구상흑연주철 FCD500의 피로파괴특성

  • Ji, Jeong-Geun (Dept.of Mechanics Mechatronics Engineering, Kangwon National University) ;
  • Kim, Min-Geon (Dept.of Mechanics Mechatronics Engineering, Kangwon National University) ;
  • Kim, Jin-Hak (Dept.of Mechanics Mechatronics Engineering, Kangwon National University) ;
  • Kim, Jeong-Du (Dept.of Mechanical Engineering, Sejong University)
  • 지정근 (강원대학교 기계메카트로닉스공학부) ;
  • 김민건 (강원대학교 기계메카트로닉스공학부) ;
  • 김진학 (강원대학교 기계메카트로닉스공학부) ;
  • 김정두 (세종대학교 기계공학과)
  • Published : 2002.04.01
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Abstract

Rotary bending fatigue tests were carried out to investigate the fatigue characteristics of high performance ductile cast iron experienced super rapid induction treatment. The influence of super rapid induction treatment on fatigue limit was experimentally examined with the special focus on the variation of surface microstructure and the fatigue crack initiation and propagation through fractography. Main results obtained are as follows. By super rapid induction treatment in FCD500, the martensite structure obtained through conventional heat treatment was confirmed on the specimen surface. The fatigue crack initiation in the hardened surface layer was restricted by the martensite structure and compressive residual stress. Thus, it could be interpreted that the initiation stress would be increased by improved structure in the surface. The fatigue crack propagation in the hardened layer was retarded by the presence of the globular shape martensite around the graphite nodule and compressive residual stress and the crack propagation behavior has zigzag pattern in the hardened surface layer.

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References

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