定向能量沉积增材制造双相不锈钢微观组织与性能研究进展

Research Progress in Microstructure and Properties of Duplex Stainless Steels by Directed Energy Deposition

双相不锈钢由于其优异的力学性能和耐腐蚀性能,被广泛应用于海洋工程、石油化工等领域。目前与铸造等传统工艺相比,定向能量沉积(DED)在制造形状复杂的大尺寸双相不锈钢结构件上具有材料利用率高、产品交付周期短等优势。然而,DED过程中复杂的热循环容易引起双相不锈钢微观组织的不均匀,导致其力学性能的各向异性和耐腐蚀性能的恶化。本文综述了近年来基于DED技术增材制造的双相不锈钢的研究现状,总结了成型工艺参数、合金成分、热处理工艺等对双相不锈钢结构件微观组织的演变、力学性能及腐蚀性能的影响,最后对该领域未来的重要研究方向进行了分析和展望。

Directed energy deposition(DED)has great advantages in manufacturing duplex stainless steel parts with complex geometry and large size as compared with traditional manufacturing techniques.The material utilization is high and the build cycle is short when applies the manufacturing technique of DED.However,there are still many problems in DED of duplex stainless steels.For example,disturbance of phase balance,intergranular and intragranular austenite and precipitates at high temperature are detrimental to their corrosion resistance and mechanical strength.In this work,an overview of the up-to-date research status and future perspectives on the DED additive manufacturing technology of duplex stainless steel is presented from extensive viewpoints including the influence of processing parameters,alloying component of the feedstock and post-heat treatment.The microstructure evolution of duplex stainless steel during additive manufacturing is highlighted in detail,which explains the change of mechanical properties and corrosion resistance,and the future research focus is analyzed and prospected.