Arc additive manufacturing is a high-productivity and low-cost technology for directly fabricating fully dense metallic components. However, this technology with high deposit rate would cause degradation of dimensional accuracy and surface quality of the metallic component. A novel hybrid additive manufacturing technology by combining the benefit of directed energy deposition and laser remelting is developed. This hybrid technology is successfully utilized to fabricate 316L component with excellent surface quality. Results show that laser remelting can largely increase the amount of δ phases and eliminate σ phases in additive manufacturing 316L component surface due to the rapid cooling. This leads to the formation of remelting layer with higher microhardness and excellent corrosion resistance when compared to the steel made by directed energy deposition only. Increasing laser remelting power can improve surface quality as well as corrosion resistance, but degrade microhardness of remelting layer owing to the decrease in δ phases.

电弧增材制造是一种用于直接制造完全致密的金属部件的高生产率且低成本的技术。但是，这种具有高沉积速率的技术会导致金属部件的尺寸精度和表面质量下降。通过结合定向能量沉积和激光重熔的优势，开发了一种新颖的混合增材制造技术。这种混合技术已成功用于制造具有出色表面质量的316L组件。结果表明，由于快速冷却，激光重熔可以极大地增加增材制造316L零件表面中的δ相数量并消除σ相。与仅通过定向能量沉积制成的钢相比，这导致形成具有更高的显微硬度和优异的耐腐蚀性的重熔层。增加激光重熔能力可以改善表面质量以及耐腐蚀性，但是由于δ相的减少而降低了重熔层的显微硬度。