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Effect of ambient pressure on bead shape, microstructure and corrosion behavior of 4043 Al alloy fabricated by laser coaxial wire feeding additive manufacturing in vacuum environment
Ding, Xueping1,2; Li, Daoyuan2; Zhang, Qi2; Ma, Honglin2; Yang, Jie2; Fan, Shuqian2
2022-09-01
摘要4043 Al alloy was fabricated by laser coaxial wire feeding additive manufacturing (LWAM) technique in vacuum environment. The effect of ambient pressure (1 Pa, 10 Pa, 50 Pa, 120 Pa) on the bead shape, microstructure and corrosion behavior was investigated. Compared the specimen fabricated at 1 Pa and 120 Pa, results showed that with the decrease of ambient pressure, the wettability became better. It was suggested that for obtaining good forming, the LWAM processing was conducted at lower ambient pressure. The microstructure was cellular consisting of primary Al-rich phase surrounded by Si phase at the cellular boundaries. With the increase of ambient pressure, the morphology of Si network became partially broken and less connected. In addition, it was found that with the decrease of ambient pressure (compared 1 Pa and 120 Pa), the corrosion resistance was improved both in H2SO4 and NaCl electrolyte. This was mainly attributed to the partially broken and less connected Si network and more porosities at 120 Pa.
关键词Laser additive manufacturing 4043 Al alloy Microstructure Corrosion behavior Vacuum
DOI10.1016/j.optlastec.2022.108242
发表期刊OPTICS AND LASER TECHNOLOGY
ISSN0030-3992
卷号153页码:9
通讯作者Fan, Shuqian(fansq@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000799354000002
语种英语