电弧增材制造2319铝合金交叉桁条结构微观组织与拉伸性能研究

doi:10.3901/JME.2023.01.267

机械工程学报 ›› 2023, Vol. 59 ›› Issue (1): 267-277.doi: 10.3901/JME.2023.01.267

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电弧增材制造2319铝合金交叉桁条结构微观组织与拉伸性能研究

王磊磊¹, 吕飞阅¹, 高转妮¹, 虞文军², 高川云², 占小红¹

1. 南京航空航天大学材料科学与技术学院南京 211106;
2. 成都飞机工业(集团)有限责任公司成都 610073

收稿日期:2022-02-15 修回日期:2022-11-10 出版日期:2023-01-05 发布日期:2023-03-30
通讯作者: 占小红(通信作者),男,1979年出生,博士,教授,博士研究生导师。主要研究方向为激光焊接与精准再制造。E-mail:xhzhan@nuaa.edu.cn
作者简介:王磊磊,男,1989年出生,博士,副研究员,硕士研究生导师。主要研究方向为激光焊接与精准再制造。E-mail:wangll@nuaa.edu.cn
基金资助:
国防基础科研计划（JCKY2020605C006）和江苏省自然科学基金青年基金（BK20200431）资助项目。

Microstructure and Tensile Properties of Wire Arc Additive Manufactured 2319 Aluminum Alloy Cross-stringer Structure

WANG Leilei¹, Lü Feiyue¹, GAO Zhuanni¹, YU Wenjun², GAO Chuanyun², ZHAN Xiaohong¹

1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106;
2. AVIC Chengdu Aircraft Industrial (Group) Co., Ltd., Chengdu 610073

Received:2022-02-15 Revised:2022-11-10 Online:2023-01-05 Published:2023-03-30

摘要/Abstract

摘要： 电弧增材制造具有材料利用率高、制造效率高、制造成本低等优势，适合制造大型复杂航空薄壁构件。目前，交叉桁条结构电弧增材制造的路径规划、成形形貌控制、组织性能差异性等方面缺乏系统研究。针对交叉桁条结构提出了一种新的分层切片及路径规划方法，解决了桁条交叉区域余高过大导致的制造精度不足问题。开展了电弧增材制造2319铝合金交叉桁条不同区域的晶粒形态、元素分布、拉伸性能、断口形貌等检测与分析，结果表明，电弧增材制造2319铝合金交叉桁条结构不同区域的晶粒形态及尺寸呈现明显差异，致使桁条顶部的平均抗拉强度值与中部、底部相比高出20%左右。在拉伸断口的韧窝中存在大量θ（Al₂Cu）颗粒相，该非共格析出相增大了晶格畸变能并且提升位错阻力，使晶体滑移难以进行，最终材料的强度显著提高。

关键词: 电弧增材制造, 交叉桁条结构, 微观组织, 元素分布, 拉伸性能

Abstract: Wire arc additive manufacturing (WAAM) has the advantages of high material utilization rate, high manufacturing efficiency, and low manufacturing cost. It is suitable for the fabrication of large and complex aviation thin-walled components. There is a lack of systematic investigation on scanning path planning, shape control, microstructure and performance difference of WAAM of cross-stringer structure. A novel layer slicing and path planning method is proposed to solve the problem of insufficient manufacturing accuracy caused by excessive reinforcement in the cross area of stringers. The grain morphology, element distribution, tensile properties, and fracture morphology in different 2319 aluminum alloy WAAMed cross stringer areas are detected and analyzed. The results indicated that the grain morphology and size in different areas of 2319 aluminum alloy WAAMed cross stringer structure are obviously different. The average tensile strength at the top of the WAAM sample is about 20% higher than that at the middle and bottom of it. There are a large number of dimples in the tensile fracture θ (Al₂Cu) particle phase. The incoherent precipitation phase increases the lattice distortion energy and enhances the dislocation resistance, which makes the crystal sliding difficult. Therefore, the strength of the material is significantly improved.

Key words: wire arc additive manufacturing, cross-stringer structure, microstructure, element distribution, tensile properties

中图分类号:

TG401

王磊磊, 吕飞阅, 高转妮, 虞文军, 高川云, 占小红. 电弧增材制造2319铝合金交叉桁条结构微观组织与拉伸性能研究[J]. 机械工程学报, 2023, 59(1): 267-277.

WANG Leilei, Lü Feiyue, GAO Zhuanni, YU Wenjun, GAO Chuanyun, ZHAN Xiaohong. Microstructure and Tensile Properties of Wire Arc Additive Manufactured 2319 Aluminum Alloy Cross-stringer Structure[J]. Journal of Mechanical Engineering, 2023, 59(1): 267-277.

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电弧增材制造2319铝合金交叉桁条结构微观组织与拉伸性能研究

Microstructure and Tensile Properties of Wire Arc Additive Manufactured 2319 Aluminum Alloy Cross-stringer Structure

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