열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제8권1호
  • /
  • Pages.44-52
  • /
  • 1995
  • /
  • 1225-1070(pISSN)
  • /
  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
권호 표지

CO2 레이저를 이용한 SM45C 강의 표면경화

Surface Hardening of SM45C Steel by CO2 Laser

  • 박진석 (전북대학교 공과대학 금속공학과) ;
  • 이오연 (전북대학교 공과대학 금속공학과) ;
  • 송기흥 (전주공업대학 금형설계과) ;
  • 한유희 (한국기계연구원 레이저가공실)
  • Park, J.S. (Dept. of Metallurgical Engineering, Chunbuk National University) ;
  • Lee, O.Y. (Dept. of Metallurgical Engineering, Chunbuk National University) ;
  • Song, K.H. (Dept. of Die & Mold Design, Chunju Technical College) ;
  • Han, Y.H. (Korea Institute of Machinery & Metals, Laser Application Lab.)
  • 발행 : 1995.03.31
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초록

The specimen for laser hardening have been carried out using SM45C which is coated with black paint or graphite for better absorption. Segmented mirror was used in order to produce a square beam ($10{\times}10mm$) at the surface with a homegeneous intensity distribution across the beam. $CO_2$-Laser power was changed from 2kW to 4kW and transfer velocity was varied from 0.1m/min to 2.0m/min. The maximum hardness and case depth of SM45C steel are 790Hv and 1.5mm by laser hardening. When the surface of specimens was melted during laser hardening. the surface hardness of SM45C steel was decreased. The surface hardness of 2 layer coated specimen(black paint: $15.4{\mu}m$, graphite coating: $9.5{\mu}m$) was increased than that of 1 layer coated specimen. It is desirable to prepare 2 or more coating layer on the steel surface in order to sufficient case depth and hardness in laser hardening. The graphite coating on the specimen surface was obtained more uniform temperature distribution than black paint coating in laser hardening process.

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