J. Mater. Sci. Technol. ›› 2025, Vol. 217: 29-46.DOI: 10.1016/j.jmst.2024.07.047

• Review Article • Previous Articles     Next Articles

Recent progress on in-situ characterization of laser additive manufacturing process by synchrotron radiation

Wenquan Lu1, Liang Zhao1, Zhun Su, Jianguo Li, Qiaodan Hu*   

  1. Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2024-03-31 Revised:2024-06-25 Accepted:2024-07-23 Published:2025-05-10 Online:2025-05-10
  • Contact: *E-mail address: qdhu@sjtu.edu.cn (Q. Hu).
  • About author:1These authors contributed equally to this work.

Abstract: Laser additive manufacturing (LAM) has been widely used in high-end manufacturing fields such as aerospace, nuclear power, and shipbuilding. However, it is a grand challenge for direct and continuous observation of complex laser-matter interaction, melt flow, and defect formation during LAM due to extremely large temperature gradient, fast cooling rate, and small time (millisecond) and space (micron) scales. The emergence of synchrotron radiation provides a feasible approach for in situ observation of the LAM process. This paper outlines the current development in real-time characterization of LAM by synchrotron radiation, including laser-matter interaction, molten pool evolution, solidification structure evolution, and defects formation and elimination. Furthermore, the future development direction and application-oriented research are also discussed.

Key words: Laser additive manufacturing, Synchrotron radiation, Melt pool, Defect