6005-T6铝合金搅拌摩擦焊接微观组织演变计算及力学性能预测

doi:10.3901/JME.2018.08.129

机械工程学报 ›› 2018, Vol. 54 ›› Issue (8): 129-136.doi: 10.3901/JME.2018.08.129

6005-T6铝合金搅拌摩擦焊接微观组织演变计算及力学性能预测

万震宇^1,2, 周霞^1,2, 张昭^1,2

1. 大连理工大学工业装备结构分析国家重点实验室大连 116024;
2. 大连理工大学工程力学系大连 116024

收稿日期:2017-06-01 修回日期:2017-10-18 出版日期:2018-04-20 发布日期:2018-04-20
通讯作者: 张昭(通信作者),男,1979年出生,博士,教授,博士研究生导师。主要研究方向为计算工艺力学。E-mail:zhangz@dlut.edu.cn
作者简介:万震宇,男,1988年出生,博士研究生。主要研究方向为搅拌摩擦焊接力学性能预测。E-mail:eagles0627@163.com
基金资助:
国家自然科学基金资助项目（11572074，11172057）。

Calculations of Microstructural Changes and Predictions of Mechanical Properties in Friction Stir Welding of AA6005-T6

WAN Zhenyu^1,2, ZHOU Xia^1,2, ZHANG Zhao^1,2

1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024;
2. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024

Received:2017-06-01 Revised:2017-10-18 Online:2018-04-20 Published:2018-04-20

摘要/Abstract

摘要： 基于Al-Mg-Si系铝合金等温及非等温过程的微观结构演变规律，建立沉淀相粒子微观组织演变模型，包括沉淀相粒子的形核、长大、溶解以及粗化阶段。结合基于自适应网格重剖分的有限元热力耦合模型建立的6005-T6铝合金搅拌摩擦焊接的数值模拟，建立搅拌摩擦焊接过程中对于该种合金的组织演变和强化模型。通过充分考虑了固溶强化、沉淀强化对力学性能的影响，预测了AA6005-T6铝合金焊接接头组织的沉淀相变化及力学性能变化，预测结果与试验验证结果吻合良好。通过模拟计算焊后人工时效研究表明：焊接状态下焊接接头的软化区域在焊接核心区域范围；经过焊后人工时效后的接头软化区域集中在热影响区域，而焊接核心区域通过焊后人工时效后再次析出沉淀相，强度得到恢复。

关键词: 沉淀相, 搅拌摩擦焊, 力学性能预测, 组织演变

Abstract: Based on the microstructural evolution rules on Al-Mg-Si alloy in isothermal and non-isothermal conditions, the precipitation evolution model is established. The nucleation, solid solution and the coarsening are comprehensively included in the established model. With combination of the adaptive-remeshing thermal-mechanical coupling FEM in numerical simulation of friction stir welding of 6005-T6, the microstructural evolution and the strengthening model of AA6005-T6 in friction stir welding is further established. With consideration of the solid solution strengthening and the precipitation strengthening, the evolutions of the second phase and the variations of the mechanical properties in friction stir welding of AA6005-T6 can be predicted. The comparison with the experimental data can validate the proposed models. By calculating the artificial ageing after welding process, a result can be clearly concluded. The soft region can be found in stirring zone area in as-welded condition, whereas the soft one lies in the heat affected zone after artificial ageing because of the reason that the re-precipitation occurs in the stirring zone.

Key words: friction stir welding, mechanical property prediction, microstructure evolution, precipitation

中图分类号:

TG402

万震宇, 周霞, 张昭. 6005-T6铝合金搅拌摩擦焊接微观组织演变计算及力学性能预测[J]. 机械工程学报, 2018, 54(8): 129-136.

WAN Zhenyu, ZHOU Xia, ZHANG Zhao. Calculations of Microstructural Changes and Predictions of Mechanical Properties in Friction Stir Welding of AA6005-T6[J]. Journal of Mechanical Engineering, 2018, 54(8): 129-136.

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6005-T6铝合金搅拌摩擦焊接微观组织演变计算及力学性能预测

Calculations of Microstructural Changes and Predictions of Mechanical Properties in Friction Stir Welding of AA6005-T6

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