Li Jiaqiang, Yang Yuan, Zhu Gangxian, Sun Chengfeng, Chen Yiyang, Wang Kejun, Shi Shihong
School of Mechanical and Electric Engineering, Soochow University, Suzhou 215021, China.
Advanced Manufacturing Technology Research Center, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong.
Materials (Basel). 2022 May 19;15(10):3642. doi: 10.3390/ma15103642.
The hybrid manufacturing method of laser cladding deposition (LCD) additive manufacturing and electrochemical machining (ECM) is a promising approach to advanced manufacturing technology for difficult machined materials. The anisotropic electrochemical performance of LCD-produced Ti6Al4V alloy was studied in 15 wt.% NaCl solution by polarization curve measurements and ECM tests. The horizontal-plane (X0Y plane) exhibits a more stable passive film in both static electrolyte and low current density ECM processes than the vertical-plane (X0Z plane). Additionally, the horizontal-plane exhibits a higher material removal rate and more consistent dissolved surface roughness in comparison with the vertical-plane during the high current density ECM process. The microstructure of the LCD-produced Ti6Al4V alloy on the horizontal-plane consisted of equiaxed-like prior-β grains and slightly finer α-laths but was composed by columnar prior-β grains and coarser α-laths on the vertical-plane. These differences in the microstructural characteristics produce the distinctions observed in the electrochemical dissolution behavior and electrochemical machinability on the horizontal- and vertical-planes.
激光熔覆沉积（LCD）增材制造与电化学加工（ECM）的混合制造方法是一种用于难加工材料的先进制造技术的有前途的方法。通过极化曲线测量和ECM测试，研究了LCD制备的Ti6Al4V合金在15 wt.% NaCl溶液中的各向异性电化学性能。在静态电解液和低电流密度ECM工艺中，水平面（X0Y平面）比垂直面（X0Z平面）表现出更稳定的钝化膜。此外，在高电流密度ECM工艺中，与垂直面相比，水平面表现出更高的材料去除率和更一致的溶解表面粗糙度。LCD制备的Ti6Al4V合金在水平面上的微观结构由等轴状的初生β晶粒和稍细的α板条组成，但在垂直面上由柱状初生β晶粒和较粗的α板条组成。这些微观结构特征的差异导致了在水平面和垂直面上观察到的电化学溶解行为和电化学加工性能的差异。
