Effect of scanning speeds on mechanical properties of CoCrNi medium entropy alloy prepared by laser additive manufacturing
Xu Kong,
Yang Li,
Na Tan,
Lanrong Cai,
Zichuan Lu,
Qiu Li,
Qiyao Deng,
Yujie Zhou,
Jia Wang,
Dingchao Hu
Affiliations
Xu Kong
School of mechanical Engineering, Tianjin University of Technology and Education, Tianjin, 300222, China
Yang Li
School of mechanical Engineering, Tianjin University of Technology and Education, Tianjin, 300222, China; National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die & Mould, Tianjin University of Technology and Education, Tianjin, 300222, China
Na Tan
School of mechanical Engineering, Tianjin University of Technology and Education, Tianjin, 300222, China; Corresponding author.
Lanrong Cai
School of mechanical Engineering, Tianjin University of Technology and Education, Tianjin, 300222, China; Corresponding author.
Zichuan Lu
Aerospace Research Institute of Materials and Processing Technology, Beijing, 10076, China
Qiu Li
School of mechanical Engineering, Tianjin University of Technology and Education, Tianjin, 300222, China
Qiyao Deng
School of mechanical Engineering, Tianjin University of Technology and Education, Tianjin, 300222, China
Yujie Zhou
School of mechanical Engineering, Tianjin University of Technology and Education, Tianjin, 300222, China
Jia Wang
School of mechanical Engineering, Tianjin University of Technology and Education, Tianjin, 300222, China
Dingchao Hu
School of mechanical Engineering, Tianjin University of Technology and Education, Tianjin, 300222, China
Medium entropy alloy (MEA) is a hot spot in the field of material research in recent years. At present, the most widely used processing method of MEAs is “casting-rolling-heat treatment”, and the preparation of CoCrNi MEA by laser additive manufacturing (LAM) is still in primary stage. In this study, CoCrNi MEAs were fabricated with different scanning speeds by laser additive manufacturing, and the influence of scanning speed on its mechanical properties was investigated. The results show that higher scanning speed can significantly improve the mechanical properties of CoCrNi MEA. Compared with the low-speed laser additive manufacturing (LSLAM) MEA, the tensile strength of high-speed laser additive manufacturing (HSLAM) MEA is increased by 5.6 % and the fracture strain is increased by 60 %, which is mainly due to the entanglement of 1/6 and 1/2 dislocations and the defect structure at the grain boundary. LAM is a promising technology that can promote the development and application of MEAs in industry.
