粉末床增材制造中粉末分层与熔融行为的研究进展

基于粉末床的增材制造技术在成形复杂形状、性能优异零件上具有显著优势，近年来成为发展最快、应用最广的增材制造技术之一。该过程涉及微观组织演化、介观粉末流动/熔融、宏观应力变形等多个尺度上的复杂行为，对这些行为的深入理解是稳定地成形制造出性能优异零件的关键。本文主要从介观尺度上研究了制造过程中粉末性质和加工条件对粉末流动分层，粉末层质量和加工参数的影响，对粉末熔融行为的研究现状进行了综述。

Research progress on powder-layering and melting behavior in powder additive manufacturing

In recent years,the powder-based additive manufacturing has become one of the fastest developing and most widely used additive manufacturing technologies with significant advantages in forming complex shapes and parts with excellent performance.The process involves complex behaviors at multiple scales,such as microstructure evolution,mesoscopic powder flow/melting,and macroscopic stress deformation.A deep understanding of these behaviors is the key to the stable forming of parts with excellent properties.In this paper,the research status of powder properties and processing conditions on powder flow stratification,and powder layer quality and processing parameters on powder melting behavior in fabrication are reviewed.