한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)

  • 제29권4호
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  • Pages.395-408
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  • 2012
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  • 1225-9071(pISSN)
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  • 2287-8769(eISSN)
한국정밀공학회 (Korean Society for Precision Engineering)
권호 표지
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초점렌즈 F-수 변화에 의한 냉간금형강 STD11 의 연속파 Nd:YAG 레이저 표면경화 특성

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

  • 황찬연 (조선대학교 첨단부품소재공학과) ;
  • 양윤석 (조선대학교 첨단부품소재공학과) ;
  • 이가람 (조선대학교 메카트로닉스공학과) ;
  • 유영태 (조선대학교 메카트로닉스공학과)
  • 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.)
  • 투고 : 2011.06.16
  • 심사 : 2011.11.25
  • 발행 : 2012.04.01
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초록

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.

키워드

참고문헌

  1. Hong, K. J., Kang, W. G., Song, J. H., Chung, I. S. and Lee, K. A., "Study on the Anisotropic Size Change by Austenitizing and Tempering Heat Treatment of STD11 Tool Steel Using Dilatometry," J. of Korean Institute of Metals and Materials, Vol. 46, No. 12, pp. 800-808, 2008.
  2. Choi, Y. G., Yang, G. S., Cho, W. S. and Jang, W. Y., "Effect of Cryogenic Treatment on Microstructure of STD11 Type Cold-Working Die Steel," J. of Advanced Engineering and Technology, Vol. 1, No. 1, pp. 225-231, 2008.
  3. Chen, T. L., Guan, Y. H., Wang, H. G. and Zhang, J. T., "A study on austenite transformation during laser heating," J. of Materials Processing Technology, Vol. 63, No. 1-3, pp. 546-549, 1997. https://doi.org/10.1016/S0924-0136(96)02680-5
  4. Grum, J. and Sturm, R., "Laser surface melthardening of gray and nodular irons," Applied Surface Science, Vol. 109-110, pp. 128-132, 1997. https://doi.org/10.1016/S0169-4332(96)00648-4
  5. Grum, J. and Sturm, R., "Influence of laser surface melt-hardening conditions on residual stresses in thin plates," Surface and Coating Technology, Vol. 100- 101, No. 1-3, pp. 455-458, 1998. https://doi.org/10.1016/S0257-8972(97)00670-1
  6. Hirogaki, T., Nakagawa, H., Hayamizu, M., Kita, Y. and Kakino,Y., "In-situ heat treatment system for die steels using YAG laser with a machining center," Precision Engineering, Vol. 25, No. 3, pp. 212-217, 2001. https://doi.org/10.1016/S0141-6359(01)00072-1
  7. Pertek, A. and Kulka, M., "Characterization of single tracks after laser surface modification of borided 41Cr4 steel," Applied Surface Science, Vol. 205, No. 1-4, pp. 137-142, 2003. https://doi.org/10.1016/S0169-4332(02)01012-7
  8. Heitkemper, M., Bohne, C., Pyzalla, A. and Fischer, A., "Fatigue and fracture behaviour of a laser surface heat treated martensite high-nitrogen tool steel," International Journal of Fatigue, Vol. 25, No. 2, pp. 101-106, 2003. https://doi.org/10.1016/S0142-1123(02)00074-9
  9. Yoo, Y. T., Shin, H. J. and Jang, W. Y., "Surface Heat treatment of Die materials by means of CW Nd:YAG Laser," J. of the Korean Society of Manufacturing Technology Engineers, Vol. 13, No. 5, pp. 66-74, 2004.
  10. Grum, J. and Slabe, J. M., "Nanoscale evaluation of laser-based surface treated 12Ni maraging steel," Applied Surface Science, Vol. 247, No. 1-4, pp. 458- 465, 2005. https://doi.org/10.1016/j.apsusc.2005.01.046
  11. Tobar, M. J., Alvarez, C., Amado, J. M., Ramil, A., Saavedra, E. and Yanez, A., "Laser transformation hardening of a tool steel : Simulation-based parameter optimization and experimental results," Surface & Coating Technology, Vol. 200, No. 22-23, pp. 6362-6367, 2006. https://doi.org/10.1016/j.surfcoat.2005.11.067
  12. Shin, H. J., Yoo, Y. T. and Ahn, D. G., "Characteristics of Laser Surface Hardening for SM45C Medium Carbon Steel using Continuous Wave Nd:YAG Laser," J. of Korean Society for Precision Engineering, Vol. 25, No. 11, pp. 52-58, 2005.
  13. Kim, D. H., "Laser Technology," Kyungmoon Publishers, p. 170, 2005.