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SLS 공정을 이용한 Fe-Cr 분말의 적층에 관한 연구
손영명(Y. M. Son),장정환(J. J. Janag),주병돈(B. D. Joo),성민영(M. Y. Sung),문영훈(Y. H. Moon) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Selective laser sintering (SLS) is a fast growing process of rapid production for metallic based parts. To restore damaged mold surface using SLS, single layer experiments of 20 μm Fe-Cr Powder Provided feasible process parameters for the smooth regular surface. To estimate coherence between melted powder and basematal, tendency of hardness distribution has been observed. Hardness of melted zone and remelted zone was diversified from 5GPa to 6.5GPa. It is over 2 times compared of hardness of basemetal. Average surface roughness of each direction on surface of melted powder was measured. Experimental results show that the mold restoring process using SLS can be sucessfully applied in the mold repair industry.
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.
Fe-Ni-Cr 코팅층 형성을 위한 SLS 공정변수의 최적화
주병돈(B. D. Joo),장정환(J. H. Jang),임홍섭(H. S. Yim),손영명(Y. M. Son),문영훈(Y. H. Moon) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Selective laser sintering(SLS), a kind of rapid prototyping technology, can provide a process to form many types of coatings. Coated layers by selective laser melting are highly influenced by substrate, powder and laser parameters such as laser power, scan rate, fill spacing and layer thickness. Therefore an attempt to fabricate Fe-Ni-Cr coating on AISI H13 tool steel has been performed by selective laser sintering. In this study, Fe-Ni-Cr coating was produced b experimental facilities consisting of a 200W fiber laser which can be focused to 0.08mm and atmospheric chamber which can control atmospheric pressure with Ar. With power increase or energy density decrease, line width was decreased and line surface quality was improved with energy density increase. Surface quality of coating layer was improved with fill spacing optimization or layer thickness decrease.