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| 激光熔化沉积制备2A50锻造铝合金组织性能* |
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赵宇辉1,2, 孙力博1,2,3, 赵吉宾1,2, 王志国1,2, 何振丰1,2, 贺晨1,2
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1.中国科学院沈阳自动化研究所 沈阳 110016;2.中国科学院机器人与智能制造创新研究院 沈阳 110169;3.沈阳工业大学材料科学与工程学院 沈阳 110870
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| 摘要: |
| 工艺参数的协同调控决定了沉积工件的组织与性能，在锻造铝合金零件激光增材修复工程应用方面具有重要研究价值。 采用 OM、SEM、XRD 等试验方法，研究能量密度对激光沉积成形 2A50 铝合金构件组织与性能的影响规律。结果表明：当能量密度低于 200 J / mm2时，成形效果较差且产生粉末球化、未熔合等凝固缺陷；随着能量密度的提高，沉积试样底部和顶部一次枝晶间距均明显缩短、平均硬度由 85.7 HV 提高至 92.1 HV；过高的能量密度输入会导致熔池内部分低熔点合金元素蒸发形成气孔缺陷、同时削弱了合金元素的固溶强化效果。在优化的能量密度(333 J / mm2 )条件下，激光沉积成形 2A50 锻造铝合金构件获得了较优的综合力学性能，其屈服强度、抗拉强度和延伸率分别为 85 MPa、207 MPa 和 14%。为航空重大装备关键零部件的激光增材修复探索出一条行之有效的技术途径。 |
| 关键词: 2A50 铝合金 激光熔化沉积 能量密度 微观组织 力学性能 |
| DOI：10.11933/j.issn.1007-9289.20211111001 |
| 分类号:TG456;TB115 |
| 基金项目:国家自然科学基金资助项目(51805526) |
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| Microstructure and Mechanical Properties of 2A50 Wrought Aluminum Alloy Prepared by Laser Melting Deposition |
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ZHAO Yuhui1,2, SUN Libo1,2,3, ZHAO Jibin1,2, WANG Zhiguo1,2, HE Zhenfeng1,2, HE Chen1,2
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1.Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016 , China;2.Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences,Shenyang 110169 , China;3.College of Material Science and Engineering, Shenyang University of Technology,Shenyang 110870 , China
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| Abstract: |
| The cooperative regulation of process parameters determines the microstructure and properties of deposited workpieces, which has important research value in the engineering application of laser additive repair of forged aluminum alloy. With the application of OM, SEM, XRD and other methods, the effect of energy density on the microstructure and mechanical properties of 2A50 aluminum alloy are studied. The results show that when the laser energy density is less than 200 J / mm2 , the forming effect of the deposited sample is poor, resulting in solidification defects such as powder spheroidization and lack of fusion. With the increase of laser energy density, the primary dendrite spacing at the bottom and top of the deposited sample is significantly shortened, the average hardness increases from 85.7 HV to 92.1 HV. However, too high energy density input will lead to the evaporation of some low melting point alloy elements in the molten pool, forming porosity defects. Therefore, under the condition of optimized laser energy density (333 J / mm2 ), the 2A50 wrought aluminum alloy fabricated by laser melting deposition has better comprehensive mechanical properties, and its yield strength, tensile strength and elongation are 85 MPa, 207 MPa and 14% respectively. It explores a more effective way for laser additive repair of key parts of aviation major equipment. |
| Key words: 2A50 aluminum alloy laser melting deposition energy density microstructure mechanical properties |