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Effects of laser power on hardness and microstructure of the surface melting hardened SKD61 hot die steel using Yb:YAG disk laser Kwang-Hyeon Lee*, Seong-Won Choi** and Chung-Yun Kang**,† *Busan Laser Application Support Center, Korea Institute of Machinery & Materials, Busan 618-230, Korea **Dept. of Material Science and Engineering, Pusan National University, Busan 609-735, Korea †Corresponding author : kangcy@pusan.ac.kr (Received April 14, 2015 ; Accepted June 10, 2015)