Transactions of the Korean Society of Mechanical Engineers (대한기계학회논문집)

The Korean Society of Mechanical Engineers (대한기계학회)
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Fatigue fracture characteristics at a electro discharge machined surface in high strength steel

高硬質재료 放電加工部의 피로파괴특성

  • 김민건 (강원대학교 기계공학과) ;
  • 지정근 (강원대학교 기계공학과 대학원) ;
  • 태원필 (강원대학교 재료공학과 대학원)
  • Published : 1993.01.01
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Abstract

A study on the fatigue fracture at electro discharge machined(E.D.M) surface has been made with special emphases on the microstructure variation and the residual stress distribution at the E.D.H heat affected zone. Results obtained are summarized as follows. (1) E.D.M brings about a variation of microstructure in heat affected zone, structures of molten, quenching, tempering are formed in order of formation from E.D.M surface. (2) Residual stress generated by E.D.M reduces the fatigue strength of the material through the influencing fatigue crack initiation and growth. (3) Magnitude of the residual stress existed in a microscopic area is approximately estimated by a COD measurement method which was originally suggested by authors.

본 연구에서는 방전가공면에서의 미시조직의 변화, 잔류응력의 분포등을 주된 연구대상으로 하여, 이들이 피로균열의 발생, 성장거동에 미칠 특이한 영향에 대하여 고찰하고자 한다.

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