High-performance integrated additive manufacturing with laser shock peening (LSP), is an innovative selective laser melting (SLM) method to improve mechanical properties, and refine microstructure in the surface layer of metallic components. Phase, residual stress distribution, surface micro-hardness, tensile properties and microstructural evolution of SLMed and SLM-LSPed specimens in horizontal and vertical directions were examined. In particular, typical microstructural features in the surface layer were characterized by transmission electron microscopy (TEM) observations. Results indicated that surface micro-hardness subjected to massive LSP treatment had significantly improved, tensile residual stress was transformed into compressive residual stress by LSP-induced plastic deformation, and both SLMed specimens in two directions exhibited a good combination of the ultimate tensile strength (UTS) and ductility. Meanwhile, high-density dislocations and a large number of mechanical twins were generated in the coarse α′ martensites by laser shock wave (LSW), and gradually evolved into refined α′ martensites. Furthermore, according to the included angle between LSW and the deposited plane, two kinds of LSW-induced atomic diffusion processes at the interfaces between both adjacent deposited layers were presented, and the influence mechanisms of the included angle between LSW and the deposited plane on tensile properties of both SLM-LSPed specimens were revealed. The hybrid additive manufacturing technology combined SLM with LSP realizes the high-efficiency and high-quality integrated manufacturing of the formed metallic components for practical applications.

具有激光冲击喷丸（LSP）的高性能集成增材制造是一种创新的选择性激光熔化（SLM）方法，可改善机械性能并改善金属部件表面层的微观结构。研究了水平和垂直方向上SLMed和SLM-LSPed试样的相，残余应力分布，表面显微硬度，拉伸性能和显微组织演变。特别地，通过透射电子显微镜（TEM）观察来表征表面层中的典型微结构特征。结果表明，经过大量LSP处理的表面显微硬度得到了显着改善，由于LSP引起的塑性变形，拉伸残余应力转化为压缩残余应力，SLMed试样在两个方向上均表现出极限抗拉强度（UTS）和延展性的良好组合。同时，通过激光冲击波（LSW）在粗α′马氏体中产生高密度位错和大量的机械孪晶，并逐渐演化为细化的α′马氏体。此外，根据LSW与沉积平面之间的夹角，给出了两种相邻沉积层之间界面处LSW诱导的原子扩散过程，以及LSW与沉积平面之间夹角对拉伸的影响机理。揭示了两个SLM-LSPed标本的特性。