Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Characteristics on Surface Hardening by using of Continuous Wave Nd:YAG Laser of Cold-Work Die Steel(STD11) about Variation of Focal Lens F-number

초점렌즈 F-수 변화에 의한 냉간금형강 STD11 의 연속파 Nd:YAG 레이저 표면경화 특성

  • Hwang, Chan-Youn (Department of Advanced parts and Materials Engineering, Chosun Univ.) ;
  • Yang, Yun-Seok (Department of Advanced parts and Materials Engineering, Chosun Univ.) ;
  • Lee, Ka-Ram (Department of Mechatronics Engineering, Chosun Univ.) ;
  • Yoo, Young-Tae (Department of Mechatronics Engineering, Chosun Univ.)
  • 황찬연 (조선대학교 첨단부품소재공학과) ;
  • 양윤석 (조선대학교 첨단부품소재공학과) ;
  • 이가람 (조선대학교 메카트로닉스공학과) ;
  • 유영태 (조선대학교 메카트로닉스공학과)
  • Received : 2011.06.16
  • Accepted : 2011.11.25
  • Published : 2012.04.01
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Abstract

An experimental investigation with 2.8kW Nd:YAG laser system was carried out to study the effects of different laser process parameters on the microstructure and hardness of STD11. The optical lens with the elliptical profile are designed to obtain a wide surface hardening area with uniform hardness. The Laser beam is allowed to scan on the surface of the work piece varying the power (1600, 1800 and 1900kW) and traverse speed (200, 400, 600, 800 and 1000mm/min) at three different F-numbers of lens. After laser surface treatment three zones, In the microstructure have been observed : melted zone(decarburization), heat affected zone(martensite), and the substrate.

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References

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