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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

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.

Keywords

Fatigue Life;Initial Crack;Nitriding Processing;SEM;Very High Cycle Fatigue

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