High Temperature Oxidation Property of Ni Based Superalloy CM247LC Produced Via Selective Laser Melting Process

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...

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Bibliographic Details
Published in:Archives of metallurgy and materials 2023-01, Vol.68 (1), p.107-112
Main Authors: Lee, Jung-Uk, Kim, Young-Kyun, Seo, Seong-Moon, Lee, Kee-Ahn
Format: Article
Language:English
Subjects:
Carbides
Crystal defects
Directional solidification
Gamma-prime phase (crystals)
Grain boundaries
High temperature
high temperature oxidation property
Hot isostatic pressing
Laser beam melting
Lasers
microstructure
ni-based superalloy
Nickel base alloys
Oxidation
Oxidation resistance
Oxidation tests
Powder beds
selective laser melting (slm)
Superalloys
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Description
Summary: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.
ISSN:1733-3490
2300-1909
DOI:10.24425/amm.2023.141481