중탄소 Boron강의 가스침질탄화처리에 의해 형성된 화합물층의 마모특성에 관한 연구

A Study on the Wear Characteristics of Compound Layers Formed during Gaseous Nitrocarburizing in Medium Carbon Boron Steels

  • 박기원 (동아대학교 공과대학 금속공학과) ;
  • 오도원 (동아대학교 공과대학 금속공학과) ;
  • 조효석 (동아대학교 공과대학 금속공학과) ;
  • 이해우 (삼성중공업 조선플랜트연구소) ;
  • 이준범 (삼성중공업 조선플랜트연구소) ;
  • 이상윤 (동아대학교 공과대학 금속공학과)
  • Park, K.W. (Dept. of Metallurgical Engineering, Dong-A University) ;
  • Oh, D.W. (Dept. of Metallurgical Engineering, Dong-A University) ;
  • Cho, H.S. (Dept. of Metallurgical Engineering, Dong-A University) ;
  • Lee, H.W. (Shipbuilding & Plant Institute, Samsung Heavy Industry Co., Ltd.) ;
  • Lee, J.B. (Shipbuilding & Plant Institute, Samsung Heavy Industry Co., Ltd.) ;
  • Lee, S.Y. (Dept. of Metallurgical Engineering, Dong-A University)
  • 발행 : 1999.06.30

초록

The study on the wear characteristics of compound layers formed during gaseous nitrocarburising in the medium carbon boron steels and the plain carbon steel has been carried out by using a pin-on-disc type wear test machine under the oil lubricating condition at room temperature and by varying applied loads, sliding speeds and wear distances. Values of friction coefficient measured at the sliding speed of 0.4m/sec under the oil lubricating condition have been shown to decrease considerably with increasing applied load and become gradually a constant value as load is increased to a higher value, showing that the transition load for friction coefficient appears at an applied load of 247.2N. The length and volume wear rates of compound layer have been revealed to relatively constantly increase, also showing that the wear life per unit thickness of compound layer turns out to be superior as porous layer has a denser and thinner appearance. As the sliding speed increases during wear test performed by varying sliding speed at a load of 63.2N under the oil lubricating condition for medium carbon boron steel nitrocarburised in gas atmosphere, the wear rate has been found to increase, the friction coefficient to decrease and the wear life per unit thickness of compound layer to decrease considerably.

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