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

The Korean Society of Mechanical Engineers (대한기계학회)
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Effect of Nitriding on Fatigue Characteristics of Cr-Mo Alloy Steel

고장력 Cr-Mo강의 질화처리에 따른 피로특성

  • Oh, Kwang Keun (Dept. of Mechanical Design Engineering, Chungnam Nat'l Univ.) ;
  • Kim, Jae Hoon (Dept. of Mechanical Design Engineering, Chungnam Nat'l Univ.) ;
  • Choi, Hoon Seok (Dept. of Mechanical Design Engineering, Chungnam Nat'l Univ.)
  • 오광근 (충남대학교 기계설계공학과) ;
  • 김재훈 (충남대학교 기계설계공학과) ;
  • 최훈석 (충남대학교 기계설계공학과)
  • Received : 2015.02.05
  • Accepted : 2015.04.01
  • Published : 2015.06.01
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Abstract

CrMo alloy steel was nitrided using two types of processing methods, ion-nitriding processing and nitrocarburizing. Both processes were conducted for a duration of 30 min. To compare the surface hardness of the alloys created by the different processes, microhardness tests were conducted, and fatigue tests of each material were performed by a cantilever rotary bending fatigue test machine (Yamamoto, YRB 200) in the very high cycle regime ($N>10^7cycle$). Fractography of the fractured surfaces was conducted by scanning electron microscopy - to observe the fracture mechanisms of very high cycle fatigue and the effect of the nitriding process on the fatigue characteristics.

고장력 Cr-Mo강은 이온질화와 연질화 두가지 질화처리를 수행하였다. 각 질화처리의 특징을 비교하기 위해서 30분의 공정시간을 가지고 질화처리를 하였다. 표면강도의 변화를 비교하기 위해서 비커스 경도 시험이 수행되었으며 피로시험은 켄틸레버 회전굽힘 피로시험기(Yamamoto, YRB 200)를 이용하여 수행되었다. 초고주기영역($N>10^7cycle$)의 특징을 알아보기 위해서 피로시험은 피로한도 이후까지 진행하였다. 피로 시험 후 주사전자현미경(SEM)을 이용해서 파단면을 분석하였으며 고주기영역과 초고주기 영역의 파괴기구를 관찰하였다.

Keywords

References

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