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何波,邢盟,孙长青,杨光.热处理对激光沉积TC4/TC11组织和性能的影响[J].稀有金属材料与工程(英文),2019,48(6):1929~1935.[He Bo,Xing Meng,Sun Changqing and Yang Guang.Effect of Heat Treatment on Microstructure and Properties of Laser DepositionTC4 / TC11[J].Rare Metal Materials and Engineering,2019,48(6):1929~1935.]
Effect of Heat Treatment on Microstructure and Properties of Laser DepositionTC4 / TC11
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Received:February 01, 2018  Revised:March 10, 2018
Key words: Laser deposition manufacturing  titanium alloy  heat treatment  microstructure  property
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目);国家重点研发计划项目(2017YFB1104002);工信部民用飞机专项科研项目(MJZ-2016-G-71);国家自然科学基金项目(51371173),辽宁省教育厅科学研究项目(L201738),航空制造工艺数字化国防重点学科实验室开放基金(SHSYS2017007)
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He Bo,Xing Meng,Sun Changqing and Yang Guang  
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      By comparing the microstructure, static mechanical properties, tensile fracture and microhardness of laser deposited TC4 / TC11 titanium alloy direct transitional parts in the as-deposited and heat-treated states, the approaches to perfect the microstructure of laser deposition TC4/TC11 alloy so as to improve its integrated mechanical properties were explored,. Results show that after the as-deposited sample undergoes 970℃ heat treatment, its length-width ratio of α laths is less than that of as-deposited and annealed samples. The microstructure on the two sides is featured by basket-weave structure and more even. In addition, the grain boundary α disappears entirely. There is almost no existence of transitive interface, which optimizes the textural parameters of TC4/TC11 titanium alloy. For all the as-deposited, relieved-stress and solution aging samples (optimal heat treatment parameters), their tensile fractures are tough fracture and their fracture sections are all on the side of TC4 titanium alloys. Among them, the strength of solution aging sample is not reduced greatly. Moreover, its plasticity is remarkably enhanced. So it has excellent integrated mechanical properties. When the temperature of the heat treatment raises to 970℃ (optimal heat treatment parameters) microhardness of TC4/TC11 titanium alloys is uniform along the whole transitive interface with minimum differences. At the same time, microhardness changes the most slightly on the matrix and transitive interface.