TY - JOUR N2 - CM247LC alloy was manufactured by using selective laser melting (SLM) process, one of the laser powder bed fusion ­(L-PBF) methods. The hot isostatic pressing (HIP) process was additionally conducted on the SLM-built CM247LC to control its microstructures and defects. The high temperature oxidation property was investigated, and it was compared with conventional DS247LC sample (reference) prepared via the directional solidification process. The L-PBF HIP sample showed blocky-type MC carbides generated along the grain boundary with average size of about 200 nm. A semi-spherical primary γ' phase of size 0.4-1.0 μm was also observed inside the grains. Moreover, the DS247LC sample displayed a coarse eutectic γ' phase and many script-type MC carbides. Furthermore, cuboidal-type γ' with an average size of about 0.5 μm was detected. High-temperature oxidation tests were conducted at 1000°C and 1100°C for 24 hours. The results at 1100°C oxidation temperature showed that the measured oxidation weight gains for HIP and DS247LC were 1.96 mg/cm2 and 2.26 mg/cm2, respectively, indicating the superior high-temperature oxidation resistance of the L-PBF HIP sample. Based on the above results, a high-temperature oxidation mechanism of the CM247LC alloys manufactured by the SLM process and the directional solidification process has been proposed. L1 - http://journals.pan.pl/Content/126237/PDF/AMM-2023-1-17-Kee-Ahn%20Lee.pdf L2 - http://journals.pan.pl/Content/126237 PY - 2023 IS - No 1 EP - 112 DO - 10.24425/amm.2023.141481 KW - Ni-based superalloy KW - Selective Laser Melting (SLM) KW - Directional solidification KW - Microstructure KW - High temperature oxidation property A1 - Lee, Jung-Uk A1 - Kim, Young-Kyun A1 - Seo, Seong-Moon A1 - Lee, Kee-Ahn 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. 68 DA - 2023.03.06 T1 - High Temperature Oxidation Property of Ni Based Superalloy CM247LC Produced Via Selective Laser Melting Process SP - 107 UR - http://journals.pan.pl/dlibra/publication/edition/126237 T2 - Archives of Metallurgy and Materials ER -