Microstructure, properties and T6 heat treatment process optimization for wire arc additive manufacturing ER2319 aluminum deposited metals

doi:10.13251/j.issn.0254-6051.2021.04.009

Abstract

Abstract: Effects of T6 heat-treatment process on microstructure and properties of ER2319 deposited metals fabricated by wire arc additive manufacturing were studied through orthogonal experiments, optical microscope, SEM and TEM. The mathematical model of tensile strength variation with the T6 heat-treatment process parameters of deposited metals was obtained through multiple linear regression, and the mechanism of microstructure evolution was also analyzed. The results show that the saliency order of T6 heat-treatment process parameters on the mechanical properties of deposited metal is as following: aging time>aging temperature>solid-solution time>solid-solution temperature. The optimized process parameters of T6 heat-treatment obtained based on the strength variation model are as follows: solid-solution treatment temperature and time of 538 ℃ and 42 min, aging temperature and time of 185 ℃ and 23 h, which make the tensile strength of deposited metals be up about 48.4% than that before heat treatment. The increase of solid-solution treatment temperature from 538 ℃ to 553 ℃, or the increase of solid-solution treatment time from 42 min to 82 min, both will lead to the remarkable coarsening of α-Al grains and severe overburning at the local grain boundary. And with the increase of solid-solution treatment time, the second phase θ-Al₂Cu is coarsened and the amount is decreased, which result in poorer mechanical properties. But the increase of aging temperature or aging time can enhance the driving force of precipitation for nano metastable phases θ′-Al₂Cu and θ″-Al₂Cu, which can significantly improve the effect of precipitation-strengthening.

Key words: wire arc additive manufacturing, ER2319 aluminum alloy, T6 heat-treatment, tensile strength, precipitation strengthening, microstructure

CLC Number:

TG156.1

Yu Runzhen, Zhao Feng, Yu Shengfu, Li Yongjie, Tang Lun. Microstructure, properties and T6 heat treatment process optimization for wire arc additive manufacturing ER2319 aluminum deposited metals[J]. Heat Treatment of Metals, 2021, 46(4): 49-59.

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