Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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The Characteristics Analysis of Track of Laser Metal Deposition Using AISI M2 Powder

AISI M2 파우더를 이용한 레이저 메탈 디포지션의 트랙 특성 분석

  • 김원혁 (엔케이에스 기술연구소) ;
  • 송명환 (명진테크 기술연구소) ;
  • 박인덕 (한국기계연구원 부산레이저기술지원센터) ;
  • 강대민 (부경대학교 기계공학과)
  • Received : 2016.02.29
  • Accepted : 2016.05.20
  • Published : 2016.07.01
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Abstract

In this paper, the characteristics analysis of LMD track, such as including track structure, track wear resistance and track thickness, were analyzed to enhance the deposition efficiency using a diode-pumped disk laser. SKD61 hot work steel plate and Fe based AISI M2 alloy were used as a the substrate and powder for the LMD process, respectively. The laser power, track pitch and powder feed rate among LMD parameters were adopted to estimate the deposition efficiency. As the laser power is increased, heat input and melting pool on the substrate is grown also increases, so resulting in the increased LMD track thickness was increased. Through EPMA mapping analysis of the cross-section in the LMD track, it was observed that all the elements are evenly distributed inside. Therefore, the entire hardness in the LMD track is expected to be almost uniform regardless of location. The characteristics of the LMD specimen were excellent compared to the STD11 specimen in terms of the wear track width and the wear rate as well as the coefficient of friction. Especially the wear rate of LMD specimen has been significantly reduced by 60 % or more. From Based on the experimental results, the prediction formula of LMD thickness was calculated by using laser power, track pitch and powder feed rate.

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References

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