电弧熔丝增材制造ER2319铝堆积金属的组织性能及T6热处理工艺优化

doi:10.13251/j.issn.0254-6051.2021.04.009

金属热处理 ›› 2021, Vol. 46 ›› Issue (4): 49-59.DOI: 10.13251/j.issn.0254-6051.2021.04.009

电弧熔丝增材制造ER2319铝堆积金属的组织性能及T6热处理工艺优化

禹润缜¹, 赵峰², 余圣甫¹, 李勇杰¹, 唐论¹

1.华中科技大学材料科学与工程学院, 湖北武汉 430074;
2.华能伊春热电有限公司, 黑龙江伊春 153011

收稿日期:2020-11-16 出版日期:2021-04-25 发布日期:2021-05-08
通讯作者: 余圣甫,教授,博导,E-mail:yushengfu@hust.edu.cn
作者简介:禹润缜(1994—),男,博士研究生,主要研究方向为电弧增材制造,E-mail:yuro94@126.com。
基金资助:
国家重点研发计划(2017YFB1103200)

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

Yu Runzhen¹, Zhao Feng², Yu Shengfu¹, Li Yongjie¹, Tang Lun¹

1. School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan Hubei 430074, China;
2. Huaneng Yichun Thermal Power Co., Ltd., Yichun Heilongjiang 153011, China

Received:2020-11-16 Online:2021-04-25 Published:2021-05-08

摘要/Abstract

摘要： 通过正交试验、光学显微镜、SEM、TEM等方法研究了T6热处理工艺对电弧熔丝增材制造ER2319堆积金属的组织与性能的影响,通过多元线性回归得出了T6热处理后堆积金属抗拉强度随工艺参数变化的数学模型,并分析了组织演变机制。结果表明, T6热处理工艺参数对堆积金属力学性能影响的显著度排序为:时效时间>时效温度>固溶时间>固溶温度。基于强度变化模型优化出的T6热处理工艺参数为固溶温度538 ℃、固溶时间42 min、时效温度185 ℃和时效时间23 h,使得堆积金属的抗拉强度较未热处理前提高了48.4%。固溶温度由538 ℃提高至553 ℃或固溶时间由42 min增加至82 min均会导致堆积金属中α-Al晶粒显著粗化且晶界局部过烧严重;固溶时间的增加还会导致第二相θ-Al₂Cu粗化且数量减少,降低堆积金属力学性能;时效温度或时效时间的增加会提高纳米级亚稳相θ′-Al₂Cu、θ″-Al₂Cu的析出驱动力,可显著提高沉淀强化效果。

关键词: 电弧增材制造, ER2319铝合金, T6热处理, 抗拉强度, 沉淀强化, 显微组织

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

中图分类号:

TG156.1

禹润缜, 赵峰, 余圣甫, 李勇杰, 唐论. 电弧熔丝增材制造ER2319铝堆积金属的组织性能及T6热处理工艺优化[J]. 金属热处理, 2021, 46(4): 49-59.

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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电弧熔丝增材制造ER2319铝堆积金属的组织性能及T6热处理工艺优化

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

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