TY - JOUR N2 - The densification behavior of H13 tool steel powder by dual speed laser scanning strategy have been characterized for selective laser melting process, one of powder bed fusion based metal 3d printing. Under limited given laser power, the laser re-melting increases the relative density and hardness of H13 tool steel with closing pores. The single melt-pool analysis shows that the pores are located on top area of melt pool when the scanning speed is over 400 mm/s while the low scanning speed of 200 mm/s generates pores beneath the melt pool in the form of keyhole mode with the high energy input from the laser. With the second laser scanning, the pores on top area of melt pools are efficiently closed with proper dual combination of scan speed. However pores located beneath the melt pools could not be removed by second laser scanning. When each layer of 3d printing are re-melted, the relative density and hardness are improved for most dual combination of scanning. Among the scan speed combination, the 600 mm/s by 400 mm/s leads to the highest relative density, 99.94 % with hardness of 53.5 HRC. This densification characterization with H13 tool steel laser re-melting can be efficiently applied for tool steel component manufacturing via metal 3d printing. L1 - http://journals.pan.pl/Content/111320/PDF/AMM-2019-2-23-Ji-Hun%20Yu.pdf L2 - http://journals.pan.pl/Content/111320 PY - 2019 IS - No 2 EP - 578 DO - 10.24425/amm.2019.127580 KW - Metal 3d printing KW - Powder bed fusion KW - Selective laser melting KW - H13 tool steel KW - re-melting A1 - Jung, Im Doo A1 - Choe, Jungho A1 - Yun, Jaecheol A1 - Yang, Sangsun A1 - Yang, Dong-Yeol A1 - Kim, Yong-Jin A1 - Yu, Ji-Hun PB - Institute of Metallurgy and Materials Science of Polish Academy of Sciences PB - Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences VL - vol. 64 DA - 2019.06.27 T1 - Dual Speed Laser Re-melting for High Densification in H13 Tool Steel Metal 3D Printing SP - 571 UR - http://journals.pan.pl/dlibra/publication/edition/111320 T2 - Archives of Metallurgy and Materials ER -