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Korean Journal of Metals and Materials > Volume 55(1); 2017 > Article
Korean Journal of Metals and Materials 2017;55(1): 16-23. doi: https://doi.org/10.3365/KJMM.2017.55.1.16
레이저 침탄공정시 철과 흑연의 혼합 슬러리가 침탄특성에 미치는 효과
지원종, 이성훈, 문영훈
부산대학교 기계공학부 정밀가공시스템/정밀정형 및 금형가공연구센터
The Effect of Mixed Slurry of Fe and Graphite on the Characteristics of Laser Carburized Surface
Won-Jong Ji, Seong-Hoon Lee, Young-Hoon Moon
School of Mechanical Engineering/ Engineering Research Center for Net Shape and Die Manufacturing, Pusan National University, Pusan 46241, Republic of Korea
Correspondence  Young-Hoon Moon ,Tel: +82-51-510-2472, Email: yhmoon@pusan.ac.kr
Received: 11 February 2016;  Accepted: 23 May 2016.  Published online: 5 January 2017.
Laser surface carburizing can be achieved by a laser alloying mechanism, which includes melting the graphite coated substrate and dissolution of the graphite in the liquid state. The drawback of laser carburizing is that process-induced cracks frequently form on the carburized surface as a result of carbon enrichment and the rapid re-solidification rates. Hence, in this study laser surface carburizing of a substrate coated with a mixed slurry of graphite and Fe powders was implemented to increase the surface hardness without surface cracking. The cracking susceptibility, carburized depth and the hardness of the carburized layer were investigated for various laser processing conditions. The results showed that a lower relative content of graphite powder in mixed slurry reduces the cracking susceptibility on the carburized surface without significantly decreasing hardness. From the analysis results, operational guides for laser surface carburizing processing are provided for achieving a crack-free carburized surface with desired hardness.
Keywords: metals, surface hardening, mechanical properties, hardness, laser carburizing
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