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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 4    August 2009

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Laser transformation hardening on rod-shaped carbon steel by Gaussian beam
Jong-Do KIM1, Myeong-Hoon LEE1, Su-Jin LEE2, Woon-Ju KANG2

1. Division of Marine System Engineering, College of Maritime Sciences, Korea Maritime University,
Yeongdo-gu, Busan, 606-791, Korea;
2. Graduate School, Korea Maritime University, Yeongdo-gu, Busan, 606-791, Korea

Abstract:Laser transformation hardening(LTH) is one of the laser surface modification processes. The surface hardening of rod-shaped carbon steel (SM45C) was performed by lathe-based laser composite processor with Gaussian-beam optical head. The LTH characteristics by dominant processes, longitudinal and depth directional hardness distributions and behaviors of phase transformation in hardened zones were examined. Especially, two concepts of circumferential speed and theoretical overlap rate were applied. When laser power increased or circumferential speed decreased, the surface hardening depth gradually increases due to the increased heat input. Moreover, the longitudinal hardness distribution particularly shows periodicity of repetitive increase and decrease, which results from tempering effect by overlap. Finally, the feasibility of laser transformation hardening is verified by using the beam with Gaussian intensity distribution.

 

Key words: surface modification; laser transformation hardening; Gaussian-beam optical head; circumferential speed; tempering

ISSN 1672-7029
CN 43-1423/U

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