引用本文:丁莹,杨海欧,白静,魏雷,陈静,林鑫.激光立体成形AlSi10Mg合金的微观组织及力学性能[J].中国表面工程,2018,31(4):46~54
DING Ying,YANG Hai-ou,BAI Jing,WEI Lei,CHEN Jing,LIN Xin.Microstructure and Mechanical Property of AlSi10Mg Alloy Prepared by Laser Solid Forming[J].China Surface Engineering,2018,31(4):46~54
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激光立体成形AlSi10Mg合金的微观组织及力学性能
丁莹1, 杨海欧2, 白静2, 魏雷2, 陈静2, 林鑫2
1.长春理工大学 空间光电技术研究所, 长春 130022;2.西北工业大学 金属高性能增材制造与创新设计工业和信息化部重点实验室, 西安 710072
摘要:
激光立体成形已逐渐成为大型高性能复杂铝合金构件制造的一条重要途径。采用具有不同波长的CO2和YAG激光器在铸态基材上进行了AlSi10Mg合金的激光立体成形，研究了不同激光器对AlSi10Mg合金沉积态和T6热处理态下的微观组织和力学性能的影响。利用XRD、OM和SEM研究了AlSi10Mg合金成形件的微观组织；利用电子拉力试验机测试了AlSi10Mg合金成形件的力学性能。结果表明：相比铸态基材，AlSi10Mg合金沉积态组织主要由<100>取向沿沉积方向外延生长的柱状α-Al枝晶和枝晶间呈纤维或颗粒状生长的Al-Si共晶组成，组织显著细化；且在530℃，3~5 min固溶处理后可实现共晶Si的球化。与CO2激光相比，采用更短波长的YAG激光进行成形时组织更为细化。经T6热处理后，采用YAG激光成形的AlSi10Mg合金力学性能明显优于压铸铝合金。
关键词:  激光立体成形  增材制造  AlSi10Mg  微观组织  力学性能
DOI：10.11933/j.issn.1007-9289.20180419001
分类号:TN249;TG136
基金项目:国家自然科学基金（51604227）
Microstructure and Mechanical Property of AlSi10Mg Alloy Prepared by Laser Solid Forming
DING Ying1, YANG Hai-ou2, BAI Jing2, WEI Lei2, CHEN Jing2, LIN Xin2
1.Space Photoelectric Technology Institute, Changchun University of Science and Technology, Changchun 130022;2.MIIT Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi'an 710072
Abstract:
Laser solid forming (LSF) has gradually become an important way to manufacture large-scale high-performance complex aluminum alloy components. AlSi10Mg alloy was deposited on the as-cast substrate by LSF using CO2 and YAG lasers respectively. The effects of laser type on the microstructure and mechanical properties of AlSi10Mg alloy deposits in as-deposited and T6 heat treated states were investigated. XRD, OM and SEM were used to study the microstructures of these deposits, and tensile test was performed to measure their mechanical properties. Results show that the as-deposited microstructure of AlSi10Mg alloy mainly consists of the columnar α-Al dendrites epitaxially grown with the <100> orientation along the deposition direction and Al-Si eutectic in the inter-dendritic with the fiber or particle shape. Compared with the as-cast microstructure, these microstructure are refined remarkably, and the spheroidization of eutectic Si can be achieved only 3-5 min in solution treatment at 530℃, which is also much shorter than that for the as-cast microstructure. Compared with CO2 laser, the more refined microstructure are obtained in LSF using YAG laser with the shorter wevelength. After T6 treatment, the mechanical properties of AlSi10Mg alloy prepared by YAG laser are obviously better than those of die-cast aluminum alloy.
Key words:  laser solid forming (LSF)  additive manufacturing  AlSi10Mg  microstructure  mechanical property
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