Research Progress in Metal Additive Manufacturing under Magnetic Field

Author of the article:CHEN Chaoyue1,2, WANG Jiang1,2, REN Zhongming1,2

Author's Workplace：1. State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200444, China; 2. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

Key Words：additive manufacturing; static magnetic field; alternative magnetic field; microstructure; mechanical property

Abstract：Magnetic field tailored additive manufacturing (MAM) technology can significantly affect the flow and heat transfer process in metal micropools, improve the metallurgical quality and control the solidification structure by virtue of the unique contactless control characteristics of electromagnetic fields. MAM technology can help to solve the unavoidable pores, cracks and element segregation defects in the traditional high-energy beam additive manufacturing process, inhibit the columnar crystal and strong texture characteristics of the microstructure, and obtain excellent comprehensive mechanical properties, which is expected to further expand the application scope of additive manufacturing technology. Although there have been a lot of studies on metallurgy and phase transformation process under electromagnetic field, the mechanism and effect of magnetic field on unsteady complex thermal cycle forming process of additive manufacturing are still unclear. In this paper, the research progress of additive manufacturing under static and alternating magnetic fields is reviewed. The effects of magnetic field on metallurgical defects such as porosity, residual stress and elemental segregation, microstructure and comprehensive mechanical properties are analyzed. The influence mechanism of magnetic field on melt flow, solidification and solid phase transition in additive manufacturing is discussed, and the future research direction and application prospect are prospected.