中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 10 October 2025 |
（1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China;
2. Institute of Reactor Waste and Radiochemistry Research, China Nuclear Power Technology Research Institute Co., Ltd., Shenzhen 518028, China;
3. Jiaxing Research Institute, Southern University of Science and Technology, Jiaxing 314031, China;
4. Department of Interventional Radiology, The First Affiliated Hospital, Southern University of Science and Technology, Shenzhen 518020, China;
5. Xi’an Sailong Metal Materials Co., Ltd., Xi’an 710016, China;
6. Double Medical Technology Inc., Xiamen 361026, China）
Abstract:This study devoted to optimize the laser powder bed fusion (LPBF) parameters for the preparation of Zr-2.5Nb alloys, and was focused on power of incident laser beam and its scanning speed. The microstructure, mechanical and corrosion properties of samples prepared at different laser powers were investigated. The results show that high quality samples were obtained with the relative density over 99%, ultimate tensile strength of 980 MPa, and the elongation at fracture of 14.18%. At a scanning speed of 1400 mm/s, with increasing laser power from 120 to 180 W, two transformation processes: α'''' martensite coarsening and transition from an acicular into a zigzag structure (β→α''''/α→α+β) occurred. Densification and α'''' martensite transition improved ductility and corrosion resistance at optimal value of the laser power while lower or higher laser power resulted in decreasing the ductility and corrosion resistance because of unfused particles and pores. Increasing β-Zr amount and size decreased the tensile strength due to the dislocation movement. Passive films, which were spontaneously formed at different laser powers, possessed an optimum corrosion resistance at the laser power of 160 W.
Key words: Zr-2.5Nb alloy; laser powder bed fusion; microstructure; mechanical properties; corrosion resistance
