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Influence of heat treatments on microstructure and mechanical properties of laser additive manufacturing Ti-5Al-2Sn-2Zr-4Mo-4Cr titanium alloy 被引量:22

热处理对激光增材制造Ti-5Al-2Sn-2Zr-4Mo-4Cr钛合金显微组织和力学性能的影响(英文)
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摘要 The effect of heat treatments on laser additive manufacturing(LAM)Ti-5Al-2Sn-2Zr-4Mo-4Cr titanium alloy(TC17)was studied aiming to optimize its microstructure and mechanical properties.The as-deposited sample exhibits features of a mixed priorβgrain structure consisting of equiaxed and columnar grains,intragranular ultra-fineαlaths and numerous continuous grain boundaryα(αGB).After being pre-annealed inα+βregion(840°C)and standard solution and aging treated,the continuousαGB becomes coarser and the precipitate free zone(PFZ)nearby theαGB transforms into a zone filled with ultra-fine secondaryα(αS)but no primaryα(αP).When pre-annealed in singleβregion(910°C),allαphases transform intoβphase and the alloying elements distribute uniformly near the grain boundary.DiscontinuousαGB and uniform mixture ofαP andαS near grain boundary form after subsequent solution and aging treatment.The two heat treatments can improve the tensile mechanical properties of LAM TC17to satisfy the aviation standard for TC17. 研究热处理对激光增材制造Ti-5Al-2Sn-2Zr-4Mo-4Cr钛合金(TC17)的影响以优化其显微组织和力学性能。研究结果表明,激光增材制造TC17钛合金沉积态样品具有粗大的原始β柱状晶和等轴晶的混合晶粒形貌、晶内超细α片层和连续晶界α相(α_(GB))等典型特征。经α+β两相区840°C预处理和标准固溶时效热处理后,连续晶界α相(α_(GB))粗化并且在其两侧形成不含初生α相(α_P)的晶界无析出区(PFZ)。经单相区910°C预处理后,所有α相完全转变成β单相并且晶界附近溶质元素分布均匀,再经过标准固溶时效热处理形成明显断续的晶界α相(α_(GB))及呈均匀分布的晶内初生α相(α_P)和次生α相(α_S)。两种热处理工艺均可以明显提高激光增材制造TC17钛合金的综合力学性能,达到了TC17锻件航空标准规定值。
作者 Yan-yan ZHU Bo CHEN Hai-bo TANG Xu CHENG Hua-ming WANG Jia LI 朱言言;陈博;汤海波;程序;王华明;李佳(北京航空航天大学材料科学与工程学院,大型金属构件增材制造国家工程实验室,北京100083)
出处 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第1期36-46,共11页 中国有色金属学报(英文版)
基金 Project(BX201600010) supported by the National Postdoctoral Program for Innovative Talents of China Project(2015QNRC001) supported by the Young Elite Scientist Sponsorship Program of China
关键词 laser additive manufacturing TC17 titanium alloy heat treatment microstructure mechanical properties 激光增材制造 TC17钛合金 热处理 显微组织 力学性能
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