Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Structure & Fatigue Behavior of TiCN and TiN/TiCN Thin Films

TiCN 및 TiN/TiCN 박막의 구조와 피로거동

  • Baeg, C.H. (Dept. of Materials Engineering, Chungbuk National University) ;
  • Hong, J.W. (Dept. of Materials Engineering, Chungbuk National University) ;
  • Wey, M.Y. (Dept. of Materials Engineering, Chungbuk National University) ;
  • Kang, H.J. (Dept. of Physics, Chungbuk National University)
  • 백창현 (충북대학교 공과대학 재료공학과) ;
  • 홍주화 (충북대학교 공과대학 재료공학과) ;
  • 위명용 (충북대학교 공과대학 재료공학과) ;
  • 강희재 (자연과학대학 물리학과)
  • Received : 2000.06.24
  • Published : 2000.09.30
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Abstract

Microstructure, mechanical and fatigue behaviors of TiCN and TiN/TiCN thin films, deposited on quenched and tempered STD61 tool steel, were investigated by using XRD, XPS, hardness, adhesion and fatigue tests. The TiCN thin film is grown along the (100), (111) orientation, whereas the TiN/TiCN thin film is grown along the (111) orientation. The preferred orientation of TiN/TiCN thin film strongly depends on the TiN buffer layer whose orientation is (111), as is well-known. The TiN/TiCN thin film showed the higher adhesion compared with TiCN single layer because the TiN buffer layer, having good toughness, reduces the effects of the lower hardness of substrate. In the high cycle tension-tension fatigue test, the fatigue life of the TiCN and the TiN/TiCN coated steel increased approximately two to four times and five to nine times respectively compared with uncoated specimens. The TiN buffer layer in multilayer thin films plays an important role in reducing residual stress and fatigue crack initiation, and then in restraining the fatigue propagation.

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