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문성민(S. M. Mun),장정환(J. H. Jang),주병돈(B. D. Joo),손영명(Y. M. Son),문영훈(Y. H. Moon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Direct laser melting technologies have been used to restore the damaged mold surface. The objective of this research work is to investigate hardness and wear-resistance of the restored mold steels. A detailed wearresistance analysis using a Pin-on-Disk (POD) testing machine compares the wear rate and the friction coefficient for various test specimens, such as the as-received AISI H13 steel, the direct melted surface without powder, the direct melted surface with Fe-Cr powder and Fe-Ni powder. Experimental results show that the micro-hardness of the melted layer is approximately 2.3 times higher than the measured hardness of the as-received specimen. The melted layer of metal powder shows the frictional reduction effect more than 10%. The wear resistance of melted layer is about 2.3 times higher than that of as-received specimen.