J. Mater. Sci. Technol. ›› 2024, Vol. 189: 96-109.DOI: 10.1016/j.jmst.2023.10.062

• Research Article • Previous Articles     Next Articles

Printability, microstructures and mechanical properties of a novel Co-based superalloy fabricated via laser powder bed fusion

Chuan Guoa, Zhen Xub, Gan Lib,c, Jingchen Wangd, Xiaogang Hub, Ying Lia, Xiaohan Chenb, Hui Liuc, Le Chengb, Shiyu Zhongc, Qiang Zhub,*, Jian Lua,c,d,**   

  1. aCityU-Shenzhen Futian Research Institute, Shenzhen 518045, China;
    bDepartment of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
    cDepartment of Mechanical Engineering, Shenyang National Laboratory for Materials Science, Greater Bay Joint Division, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;
    dCentre for Advanced Structural Materials, City University of Hong Kong Shenzhen Research Institute, Greater Bay Joint Division, Shenyang National Laboratory for Materials Science, Shenzhen 518057, China
  • Received:2023-08-09 Revised:2023-10-23 Accepted:2023-10-29 Published:2024-08-01 Online:2024-01-09
  • Contact: *CityU-Shenzhen Futian Research Institute, Shenzhen 518045, China. E-mail addresses: . zhuq@sustech.edu.cn (Q. Zhu), **jianlu@cityu.edu.hk (J. Lu)

Abstract: High levels of Al and Ti in superalloy compositions normally lead to cracking formation during the laser powder bed fusion process, while these elements are key constituents of strengthening phases. In the current study, a novel Co-based superalloy with the basic chemical composition of Co-Al-W-Ta-Ti resolved this contradiction, indicating that the part was formed without cracking and simultaneously contained a large amount of strengthening precipitates in the microstructure fabricated via laser powder bed fusion. The printability, microstructures, and mechanical properties of the sample were analysed before and after heat treatment, providing a potential superalloy that can replace Ni-based superalloys fabricated by additive manufacturing in aerospace and other industries with higher temperature and more efficiency.

Key words: Co-based superalloy, Laser powder bed fusion, Printability, Microstructure, Mechanical properties