This paper investigates the effect of ultrasonic surface rolling processing (USRP) on the surface integrity, microstructure, hardness, and residual stress of selective electron beam melted (SEBMed) Ti6Al4V with as-built surface. Results show that the semi-melted powder and melting pool ridges are flattened due to the ultrasonic impact and static load, as well as surface defects, such as ‘stairs’ and holes, are eliminated. The surface integrity of the sample is significantly improved. The surface roughness Ra and Rz of the USRP treated sample with 800 N is reduced by ∼95 % and ∼90 %, the surface hardness is increased by ∼16.2 % compared with the as-built surface. A gradient microstructure and hardened layer exceeded 110 μm is obtained. What’s more, the surface wettability changes from hydrophobicity to hydrophily.

本文研究了超声表面滚压加工 (USRP) 对选择电子束熔炼 (SEBMed) Ti6Al4V 的表面完整性、微观结构、硬度和残余应力的影响。结果表明，由于超声冲击和静载荷，半熔粉末和熔池脊被压平，同时消除了“阶梯”和孔洞等表面缺陷。样品的表面完整性得到显着改善。800 N 的 USRP 处理样品的表面粗糙度 Ra 和 Rz 降低了约 95% 和约 90%，表面硬度与竣工表面相比增加了约 16.2%。获得超过 110 μm 的梯度微观结构和硬化层。更重要的是，表面润湿性从疏水性变为亲水性。