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레이저 열처리 광학계를 이용한 금형소재의 표면 열처리 특성
신호준(Ho-Jun Shin),유영태(Young-Tae Yoo),신병헌(Hyung-Heon Shin),노경보(Kyoung-Bo Ro) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Laser surface treatment technologies have been used to improve characteristics of wear and to enhance the fatigue resistance for mold parts. The optical lens with the elliptical profile is designed to obtain a wide surface hardening area with a uniform hardness. The objective of this research work is to investigate the influence of the process parameters, such as power of laser and defocused spot position, on the characteristics of laser surface treatment for the case of SKD61 steel and SCM4 steel. From the results of the experiments, it has been shown that the maximum average hardness is approximatly 700~780 Hv when the power, focal position and the travel of laser are 1,095 W, 0㎜ and 0.3 m/min, respectively. In samples treated with lower scanning speeds, some small carbide particles appear in the interdendritic regions. This region contains fine martensite and carbide in proportions which depend on the local thermal cycle.