Y_(2)O_(3)弥散强化TC4钛合金粉末及其激光熔覆组织性能研究  

Y_(2)O_(3) dispersion strengthened TC4 powder and its laser cladding microstructure

作　　者：张成阳 何思逸 杨威 郭双全 王宁 徐轶[1] Zhang Chengyang;He Siyi;Yang Wei;Guo Shuangquan;Wang Ning;Xu Yi(School of Materials Science and Engineering,Southwest Jiaotong University,Key Laboratory of Advanced Materials Technology,Ministry of Education,Chengdu 610031,Sichuan,China;China Aviation Development Shenyang Liming Aeroengine Co.,Ltd,Shenyang110043,Liaoning,China;Chengdu Tianxiang Power Technology Research Institute Co.,Ltd.,Chengdu 610095,Sichuan,China;Sichuan Hitaipu Technology Co.,Ltd.,Chengdu 610095,Sichuan,China;Sichuan Liuhe Special Metallic Materials Co.,Ltd.,Jiangyou 621700,Sichuan,China)

机构地区：[1]西南交通大学材料科学与工程学院,材料先进技术教育部重点实验室,四川成都610031 [2]中国航发沈阳黎明航空发动机有限责任公司,辽宁沈阳110043 [3]成都天翔动力技术研究院有限公司,四川成都610095 [4]四川海泰普科技有限公司,四川成都610095 [5]四川六合特种金属材料股份有限公司,四川江油621700

出　　处：《钢铁钒钛》2023年第1期64-71,共8页Iron Steel Vanadium Titanium

基　　金：四川省高新技术领域重点研发项目(20ZDYF0490、20ZDYF0236)。

摘　　要：激光熔覆修复技术可用于修复损伤的钛合金工件。与锻造件相比,熔覆件在激光熔覆过程中容易引入氧,导致氧含量偏高和强度偏低的问题。采用等离子旋转电极法(PREP)制备了TC4-x Y(x=0,0.1,0.3,0.5)的预合金粉末,并使用该合金粉末通过激光熔覆工艺技术方法修复TC4合金工件。结果表明,在钇(Y)引入后产生的弥散体Y_(2)O_(3)均匀分布在粉末上,随着Y含量的增加,粉末的显微维氏硬度增加。在TC4-x Y熔覆层中,其显微维氏硬度随着Y含量的增加而增加。然而,由于脆性相析出的影响,熔覆层的拉伸性能呈现先上升后下降的趋势,其伸长率呈现相反的趋势,TC4-0.3Y熔覆层的1058 MPa拉伸性能最优异,同时伸长率也达到7.2%。通过对Y含量的调控,能够促进熔覆层组织改善与力学性能提升。Laser cladding repairing technology can be used to repair damaged TC4 alloy components.Compared with forged components, oxygen is more easily introduced during laser cladding, which results that cladding components have the problems of high oxygen content and low strength. In this study,TC4-x Y(x = 0, 0.1, 0.3, 0.5) prealloyed powder was prepared by plasma rotating electrode process(PREP), then TC4 alloy components were laser cladding repaired with the powder. The results indicate that the introduction of yttrium(Y) induces Y_(2)O_(3)dispersion evenly distributed on the powder, as the Y content increases, Micro Vickers hardness of the powder rises. In the TC4-xY cladding layers, the Micro Vickers hardness rises with the increase of Y content. However, because of the excessive precipitation of brittle phase, the tensile property of the cladding layers shows a trend from rise to decline, then the elongation just shows the reverse trend. The 1 058 MPa tensile property of the TC4-0.3Y cladding layer is the most excellent, then its 7.2% elongation is the worst. The regulation of Y content is conducive to improving the tensile strength of the cladding layer.

关 键 词：激光熔覆修复 TC4钛合金粉末 等离子旋转电极雾化制粉 稀土元素Y 氧化物弥散强化 细化晶粒 

分 类 号：TF823[冶金工程—有色金属冶金] TG665[金属学及工艺—金属切削加工及机床]