Influences of Process Parameters on the Microstructure and Mechanical Properties of CoCrFeNiTi Based High-Entropy Alloy in a Laser Powder Bed Fusion Process
Takafumi Ikeda,
Makiko Yonehara,
Toshi-Taka Ikeshoji,
Tohru Nobuki,
Minoru Hatate,
Kosuke Kuwabara,
Yasuhiko Otsubo,
Hideki Kyogoku
Affiliations
Takafumi Ikeda
Graduate School of Systems Engineering, Kindai University, 1 Takaya-Umenobe, Higashihiroshima, Hiroshima 739-2116, Japan
Makiko Yonehara
Fundamental Technology for Next Generation Research Institute, Kindai University, 1 Takaya-Umenobe, Higashihiroshima, Hiroshima 739-2116, Japan
Toshi-Taka Ikeshoji
Fundamental Technology for Next Generation Research Institute, Kindai University, 1 Takaya-Umenobe, Higashihiroshima, Hiroshima 739-2116, Japan
Tohru Nobuki
Fundamental Technology for Next Generation Research Institute, Kindai University, 1 Takaya-Umenobe, Higashihiroshima, Hiroshima 739-2116, Japan
Minoru Hatate
Fundamental Technology for Next Generation Research Institute, Kindai University, 1 Takaya-Umenobe, Higashihiroshima, Hiroshima 739-2116, Japan
Kosuke Kuwabara
Global Research and Innovative Technology Center GRIT, Hitachi Metals, Ltd. 5200 Mikajiri, Kumagaya, Saitama 360-8577, Japan
Yasuhiko Otsubo
Additive Manufacturing Solution Center, Advanced Metal Division, Hitachi Metals, Ltd., 2-14-13 Tenjin, Chuo-ku, Fukuoka 810-0001, Japan
Hideki Kyogoku
Fundamental Technology for Next Generation Research Institute, Kindai University, 1 Takaya-Umenobe, Higashihiroshima, Hiroshima 739-2116, Japan
Recently, high-entropy alloys (HEAs) have attracted much attention because of their superior properties, such as high strength and corrosion resistance. This study aimed to investigate the influences of process parameters on the microstructure and mechanical properties of CoCrFe NiTiMo HEAs using a laser-based powder bed fusion (LPBF) process. In terms of laser power and scan speed, a process map was constructed by evaluating the density and surface roughness of the as-built specimen to optimize the process parameters of the products. The mechanical properties of the as-built specimens fabricated at the optimum fabrication condition derived from the process map were evaluated. Consequently, the optimum laser power and scan speed could be obtained using the process map evaluated by density and surface roughness. The as-built specimen fabricated at the optimum fabrication condition presented a relative density of more than 99.8%. The microstructure of the as-built specimen exhibited anisotropy along the build direction. The tensile strength and elongation of the as-built specimen were around 1150 MPa and more than 20%, respectively.
