摘要
现用于激光熔化沉积的钛合金,通常是已有的工业合金,并没有考虑到激光熔化沉积工艺的特殊性。此外,高端装备领域对钛合金的室温和高温综合性能要求也不断提高。本文基于Ti-6Al-4V合金α相团簇式[Al-Ti_(12)](AlTi_(2))和β相团簇式[Al-Ti_(14)](AlVTi),通过Zr和V/Mo/Nb分别替代(相团簇式壳层和连接原子Ti的合金化,设计了一系列12[Al-Ti_(12)](AlTi_(2))+5[Al-Ti_(14)-xZrx](AlV_(1.2)Mo)(0.6)Nb_(0.2))合金,并研究了激光熔化沉积Ti-Al-V-Mo-Nb-Zr系合金的微观组织和力学性能随Zr元素含量的演化规律。结果表明,Ti-Al-V-Mo-Nb-x Zr合金的液-固两相区较小,有利于保证激光熔化沉积的工艺性。此外,随Zr含量的增加,Ti-Al-V-Mo-Nb-x Zr合金外延生长β柱状晶的长度和宽度显著降低,室温和高温强度显著提高。其中,12[Al-Ti_(12)](AlTi_(2))+5[Al-Ti_(12)Zr_(2)](AlV_(1.2)Mo)(0.6)Nb_(0.2))合金的室温抗拉强度为1427 MPa,伸长率为3.2%;600℃高温抗拉强度为642 MPa,伸长率为40%。该合金可以作为激光熔化沉积用高温高强钛合金的候选材料。
Generally,the titanium alloys used for the laser melting deposition(LMD)currently are applied industrial ones,but ignored the particularity of the LMD process.Moreover,in the field of high-end equipment,the requirements for the comprehensive performances of the titanium alloys at room and high temperature are upgraded constantly.Therefore,in this paper,based on theαphase cluster formula[Al-Ti_(12)](AlTi_(2))andβphase cluster formula[Al-Ti_(14)](AlVTi)of Ti-6Al-4V alloy,a series of 12[Al-Ti_(12)](AlTi_(2))+5[Al-Ti1_(4-x)Zr_(x)](AlV_(1.2)Mo_(0.6)Nb_(0.2))alloys were designed via Zr and V/Mo/Nb to replace Ti of the cluster center and glue atom positions.Then,the microstructure and mechanical properties of the LMDed Ti-Al-V-Mo-Nb-xZr alloys were investigated.The results showed that the solidification range of Ti-Al-V-Mo-Nb-xZr alloys was relatively narrow,which was beneficial to the manufacturability.In addition,with the increasing of Zr content,the length and width of Ti-Al-V-Mo-Nb-xZr alloys epitaxial prior-βcolumnar grains were significantly reduced,and the room and high temperature strength were remarkably improved.Among them,the room temperature tensile strength of 12[Al-Ti_(12)](AlTi_(2))+5[Al-Ti_(12)Zr_(2)](AlV_(1.2)Mo)(0.6)Nb_(0.2))alloy was 1427 MPa,and the elongation was 3.2%;the high temperature tensile strength of 600℃was 642 MPa,and the elongation was 40%.The 12[Al-Ti_(12)](AlTi_(2))+5[Al-Ti_(12)Zr_(2)](AlV_(1.2)Mo)(0.6)Nb_(0.2))alloy could be used as a candidate material of high temperature and high strength titanium alloy for LMD.
作者
刘田雨
赵军
刘时兵
韩鹏江
史昆
姚谦
梅新民
陈红
LIU Tian-yu;ZHAO Jun;LIU Shi-bing;HAN Peng-jiang;SHI Kun;YAO Qian;MEI Xin-min;CHEN Hong(Shenyang Research Institute of Foundry Co.,Ltd.,CAM,Nation Key Laboratory of Advanced Casting Technologies,Shenyang110022,Liaoning,China;Beihang University,Beijing 100191,China;Military Representative Office of Air Force Equipment in Liaoyang,Shenyang 110016,Liaoning,China)
出处
《铸造》
CAS
北大核心
2023年第11期1447-1454,共8页
Foundry
基金
沈阳市自然科学基金(22-315-6-05)
“揭榜挂帅”产业共性技术项目(22-101-0-24)
陕西省教育厅一般专项科研计划项目(22JK0640)。
