激光熔覆沉积含硼TC4钛合金力学性能的各向异性  

Anisotropy of Mechanical Properties of Laser-Cladding-Deposited TC4 Titanium Alloy Containning Boron

作　　者：霍浩 梁朝阳 张安峰[1] 张晓星 张金智 王豫跃[3] Huo Hao;Liang Zhaoyang;Zhang Anfeng;Zhang Xiaoxing;Zhang Jinzhi;Wang Yuyue(State Key Laboratory far Manufacturing Systems Engineering,Xi'an Jiaotong University,Xi'an,Shaanxi 710054,China;Chinese Peopled Liberation Army 63850 Army,Baicheng,J ilin 137000,China;State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an,Shaanxi 710049,China)

机构地区：[1]西安交通大学机械制造系统工程国家重点实验室,陕西西安710054 [2]中国人民解放军63850部队,吉林白城137000 [3]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《中国激光》2019年第12期109-116,共8页Chinese Journal of Lasers

基　　金：国家重点研发计划(2016YFB1100102);国家自然科学基金(51775417)

摘　　要：针对激光熔覆沉积TC4钛合金力学性能较低,不能达到锻件标准且力学性能各向异性较大的问题,通过机械搅拌预制不同硼含量的TC4粉体,使用预制粉体进行激光熔覆沉积实验,以达到调控微观组织、提高综合力学性能的目的。结果表明:当硼质量分数为0.050%时,沉积态TC4钛合金的力学性能均超过锻件标准,屈服强度和抗拉强度分别为1049 MPa和1136 MPa,延伸率和断面收缩率分别达到11.50%和33.5%,但塑性各向异性高达30%以上;经过950℃×1 h/空冷+500℃×4 h/空冷固溶时效热处理后,综合力学性能进一步提高,在保证强度的同时,延伸率和断面收缩率分别达到16.70%和37.3%,且各向异性小于5%。The laser-cladding-deposited TC4 titanium alloy is considerably anisotropic, and its mechanical properties are lower than the forging standards. In this study, boron(B) with different mass fractions is uniformly mixed into the TC4 powder by mechanical stirring, refining the microstructure and improving the comprehensive mechanical properties of the alloy. Results show that at a B mass fraction of 0.050%, the mechanical properties of the deposited TC4 titanium alloy exceed the forging standard, and the yield and tensile strengths become 1049 MPa and 1136 MPa, respectively. Furthermore, the elongation and area reduction become 11.50% and 33.5%, respectively, though the plastic anisotropy is larger than 30%. After solid solution and aging heat treatment with 950 ℃×1 h/air cooling +500 ℃×4 h/air cooling, the comprehensive mechanical properties are further optimized and the anisotropy is reduced to less than 5%. While we ensure suitable mechanical strength, the elongation and area reduction are enhanced to 16.70% and 37.3%, respectively.

关 键 词：激光技术 各向异性 钛合金 激光熔覆沉积 硼 微观组织 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG146.23[一般工业技术—材料科学与工程]