标题：Microstructure and properties of Al alloy ER5183 deposited by variable polarity cold metal transfer
作者：Zhang, Bowen; Wang, Chao; Wang, Zhaohui; Zhang, Laiqi; Gao, Qiang
作者机构：[Zhang, Bowen; Zhang, Laiqi; Gao, Qiang] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China.; [Wang, Chao] Inn 更多
通讯作者：Zhang, Laiqi;Zhang, LQ;Wang, ZH
通讯作者地址：[Zhang, LQ]Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China;[Wang, ZH]Shandong Univ, Sch Mech Engn, Jinan 2500 更多
来源：JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
关键词：Wire arc additive manufacturing; Variable polarity cold metal transfer;; Solidification behavior; Microstructural evolution
摘要：Nine groups of wire arc additive manufacturing (WAAM) aluminum alloy walls with different layers were deposited by variable polarity cold metal transfer arc mode using ER 5183. Their microstructures were characterized by optical microscopy and electron back scattered diffraction. For the top layer, grain size increased from 37 mu m to 65 mu m, and then stabilized at around 41 mu m, in accordance with the decrease of microhardness from 98.7 HV to 76.4 HV. As the number of deposited layers increased, the anisotropy in the bottom layers was weaken, and small-angle grain boundary may cause an increment to 96.1HV in the microhardness before stabilized around 81HV due to the heat accumulation.