2024铝合金CMT+P电弧增材制造组织与耐腐蚀性能

颜军培; 路学成; 张志强; 卓帅; 李涵茜

doi:10.11868/j.issn.1001-4381.2023.000743

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材料工程 ›› 2025, Vol. 53 ›› Issue (3) : 105-116. DOI: 10.11868/j.issn.1001-4381.2023.000743

研究论文

2024铝合金CMT+P电弧增材制造组织与耐腐蚀性能

颜军培 ¹ ,
路学成 ¹ ,
张志强 ¹^,² ,
卓帅 ¹ ,
李涵茜 ¹

作者信息 +

Microstructure and corrosion resistance of CMT+P wire arc additive manufacturing 2024 aluminum alloy

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摘要

采用冷金属过渡和脉冲（cold metal transfer and pulse，CMT+P）复合电弧增材制造工艺制备2024铝合金增材件，研究2024铝合金CMT+P电弧增材制造气孔缺陷、晶粒形貌、物相析出的分布特征，以及不同工艺参数对气孔缺陷、晶粒形貌、物相析出和耐腐蚀性能的影响。结果表明：2024铝合金增材件的气孔主要分布于熔合线附近，热输入相同时，更快的送丝速度和电弧行驶速度导致更高的孔隙率。同一沉积层上部为无择优取向的等轴晶，下部为具有择优取向的柱状晶，热输入相同时，更快的送丝速度和电弧行驶速度导致细晶区的产生，增加等轴晶比例，减弱织构。析出的二次相主要为Al₂CuMg，Al₂Cu和富Fe，Mn相，沿晶界连续分布。影响增材件腐蚀初期耐腐蚀性能的主要因素为Al₂CuMg的析出量。更慢的送丝速度和电弧行驶速度下具有更好的耐局部腐蚀性能，这主要是由更低的Al₂CuMg相比例分数导致。

Abstract

As-deposited parts of 2024 aluminum alloy are fabricated by cold metal transfer and pulse （CMT+P） hybrid wire arc additive manufacturing. The distributions of pore defects， grain morphology， and secondary phase precipitation of CMT+P wire arc additive manufacturing 2024 aluminum alloy， and the influence of different process parameters on pore defects， grain morphology and secondary phase precipitation， and corrosion resistance are investigated. The results show that the pores of the as-deposited parts of 2024 aluminum alloy are mainly distributed near the fusion line. In the same heat input， the larger wire feed speed and travel speed result in higher porosity. In a deposition layer， the upper part is the equiaxed grain without preferred orientation， and the lower part is the columnar grain with preferred orientation. In the same heat input， the texture is weakened and the percentage of equiaxed grains is increased due to the fine grain region in the higher wire feed speed and travel speed. The precipitated secondary phases are mainly Al₂CuMg， Al₂Cu， and rich-Fe， Mn phases. The secondary phases distribute continuously along the grain boundaries. In the early stage of corrosion， the main factor affecting the corrosion resistance of as-deposited parts is the precipitation amount of Al₂CuMg. The better local corrosion resistance is mainly caused by lower Al₂CuMg phase fraction in lower wire feed speed and travel speed.

关键词

高强铝合金 / 电弧增材制造 / 气孔 / 微观组织 / 耐腐蚀性能

Key words

high strength aluminum alloy / wire arc additive manufacturing / pore / microstructure / corrosion resistance

中图分类号

TG444 / TB31

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导出引用

颜军培 , 路学成 , 张志强 , 等. 2024铝合金CMT+P电弧增材制造组织与耐腐蚀性能. 材料工程. 2025, 53(3): 105-116 https://doi.org/10.11868/j.issn.1001-4381.2023.000743

Junpei YAN, Xuecheng LU, Zhiqiang ZHANG, et al. Microstructure and corrosion resistance of CMT+P wire arc additive manufacturing 2024 aluminum alloy[J]. Journal of Materials Engineering. 2025, 53(3): 105-116 https://doi.org/10.11868/j.issn.1001-4381.2023.000743

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基金

航空科学基金(2020Z049067002)

天津市自然科学基金(22JCYBJC01280)

中央高校基本科研业务费自然科学重点项目(3122023039)

国家自然科学基金(51905536)

天津市研究生科研创新项目(2022SKYZ351)

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Received	Revised	Published
2023-11-08	2024-10-25	2025-03-20
Issue Date
2025-06-18

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