选区激光熔化TC4合金高温力学性能及腐蚀行为研究  

High Temperature Mechanical Properties and Corrosion Behavior of Selective Laser Melted TC4 Alloy

作　　者：聂敬敬 马平义 孙京丽 柯林达[1] 康靓 夏先朝 袁勇[1] Nie Jingjing;Ma Pingyi;Sun Jingli;Ke Linda;Kang Liang;Xia Xianchao;Yuan Yong(Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China)

机构地区：[1]上海航天精密机械研究所,上海201600

出　　处：《稀有金属材料与工程》2023年第6期2126-2133,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51701116);上海市青年科技启明星计划(19QB1402000)。

摘　　要：采用选区激光熔化技术(selectivelasermelting,SLM)制备了TC4合金,利用光学显微镜、扫描电子显微镜、X射线衍射仪、万能材料试验机以及电化学测试等技术研究其热处理后的组织、高温力学性能及腐蚀行为,并与铸造TC4合金做了对比。结果表明,SLM与铸造TC4合金物相组成相同,SLM TC4合金组织主要为片层状(α+β)相,平均晶粒面积约为2μm^(2),而铸造TC4合金表现出典型的魏氏组织,平均晶粒面积约为276μm^(2)。相对于铸造TC4合金,SLM TC4合金的室温及高温力学性能均较优异,且表面形成的钝化膜保护性能更好,腐蚀速率更低。TC4 alloy was fabricated by selective laser melting(SLM).The microstructure,high-temperature mechanical properties and corrosion behavior of TC4 alloy after heat treatment were studied by OM,SEM XRD,universal tensile testing machine and electrochemical testing,and compared with those of as-cast TC4 alloy.The results show that the phase composition of SLM is the same as that of cast TC4 alloy.The microstructure of SLM TC4 alloy is mainly lamellar(α+β)phase,with an average grain area of about 2μm^(2),while the as-cast TC4 alloy shows a typical Widmanstatten structure,and the average grain area is about 276μm^(2).Compared with as-cast TC4 alloy,SLM TC4 alloy possesses excellent mechanical properties at both room temperature and high temperature,and the passivation film formed on its surface has better protection performance,resulting in a lower corrosion rate.

关 键 词：选区激光熔化 TC4合金 组织 力学性能 腐蚀行为 

分 类 号：TG146.23[一般工业技术—材料科学与工程]