Microstructure and molten pool morphology of TiB2/ AlSi7Mg composites fabricated by infrared-blue hybrid laser powder bed fusion
Jiayin Wu,
Huihui Yang,
Guojie Lu,
Yi Wu,
Hongze Wang,
Haowei Wang
Affiliations
Jiayin Wu
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China; School of Materials Science & Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
Huihui Yang
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China; School of Materials Science & Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Institute of Alumics Materials, Shanghai Jiao Tong University (Anhui), Huaibei, 235000, China; Corresponding author. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China.
Guojie Lu
Shenzhen United Winners Laser Co Ltd, Shenzhen, 518055, China
Yi Wu
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China; School of Materials Science & Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Institute of Alumics Materials, Shanghai Jiao Tong University (Anhui), Huaibei, 235000, China
Hongze Wang
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China; School of Materials Science & Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Institute of Alumics Materials, Shanghai Jiao Tong University (Anhui), Huaibei, 235000, China
Haowei Wang
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China; School of Materials Science & Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Institute of Alumics Materials, Shanghai Jiao Tong University (Anhui), Huaibei, 235000, China
A hybrid laser composed of infrared and blue laser is applied in fabricating TiB2/AlSi7Mg composites on AlSi7Mg substrate by LPBF. The effect on formability, molten pool morphology, molten pool size and microstructure under infrared, blue and hybrid laser were compared. It was confirmed that hybrid laser can make up for the unbalanced energy distribution of infrared laser and the low energy density of blue laser. The increased energy input improves the molten pool size and cellular dendrites size. Therefore, the hybrid laser can improve the formability and forming stability in the LPBF process of low absorption rate alloys.
