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激光熔化沉积法制备2A50铝合金热处理工艺

Heat Treatment Process of 2A50 Aluminum Alloy Prepared by Laser Melting Deposition Method
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摘要 基于激光熔化沉积技术进行了高强度锻造型2A50铝合金增材制造实验,为了提高增材构件的综合力学性能,开展了增材制造高强度铝合金的热处理工艺研究。结合X射线衍射分析仪(XRD)、扫描电子显微镜(SEM)、显微硬度仪以及拉伸试验等检测手段,研究了不同热处理工艺参数对增材试样微观组织及力学性能的影响规律。结果表明:沉积态试样具有明显的柱状树枝晶结构,热处理后粗大柱状树枝晶发生断裂,晶粒开始球化并在晶界处形成均匀分布的块状第二相;在优化的热处理工艺条件下(540℃/1 h+150℃/16 h),结合溶质元素的固溶强化与第二相的析出强化作用,增材试样的屈服强度、抗拉强度、显微维氏硬度的平均值分别由沉积态的85、207、889.55 MPa提高至热处理后的245、321、1344.56 MPa。 In order to improve the comprehensive mechanical properties of additive components, the heat treatment process of high strength wrought 2A50 aluminum alloy was studied based on the laser melting deposition technology. The effects of different h eat treatment parameters on the microstructure and mechanical properties of additive samples were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM), microhardness tester and tensile test. The results show that the as deposited samples hav e obvious columnar dendrite structure. After heat treatment, the coarse columnar dendrites fracture, and the grains begin to spheroidiz e and form a uniformly distributed massive second phase at the grain boundary. Under the optimized heat treatment conditions(540 ℃/1 h+150 ℃/16 h),combined with the solid solution strengthening of solute elements and the precipitation strengthening of the second phase, th e average values of yield strength, tensile strength and microhardness(HV) of the additive samples increase from 85, 207 and 889.55 MPa in the as deposited state to 245, 321 and 1344.56 MPa after heat treatment, respectively.
作者 赵宇辉 孙力博 赵吉宾 王志国 何振丰 贺晨 Zhao Yuhui;Sun Libo;Zhao Jibin;Wang Zhiguo;He Zhenfeng;He Chen(Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110016,China;Institutes for Robotics and Intelligent Manufacturing,Chinese Academy of Sciences,Shenyang 110169,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Material Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)
出处 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2022年第7期2578-2584,共7页 Rare Metal Materials and Engineering
基金 国家重点研发计划(2017YFB1104003) 中央引导地方科技发展专项资金(2021JH6/10500119) 国家自然科学基金(51805526) 广东省基础与应用基础研究基金(2020B1515120027)。
关键词 2A50铝合金 激光熔化沉积 热处理工艺 微观组织 力学性能 2A50 aluminum alloy laser melting deposition heat treatment microstructure mechanical properties
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