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何波,邢盟,孙长青,杨光.热处理对激光沉积TC4组织和性能的影响[J].稀有金属材料与工程(英文),2019,48(9):3007~3014.[He Bo,Xing Meng,Sun Changqing and Yang Guang.Effect of Heat Treatment on Microstructure and Properties of Laser Deposition TC4[J].Rare Metal Materials and Engineering,2019,48(9):3007~3014.]
Effect of Heat Treatment on Microstructure and Properties of Laser Deposition TC4
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Received:April 03, 2018  Revised:July 10, 2018
DOI:
Key words: Laser deposition manufacturing  titanium alloy  heat treatment  microstructure  property
Foundation item: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)
Author NameAffiliation
He Bo,Xing Meng,Sun Changqing and Yang Guang  
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Abstract:
      By comparing the microstructures,static mechanical properties and microhardness of laser deposition TC4 alloy in the as-deposited and heat-treated states, the approaches to perfect the microstructure of laser deposition TC4 alloy are explored. Results show that after the as-deposited sample undergoes 970℃ heat treatment, the grain boundary α is thoroughly broken which is continuous initially; with the extension of solution time, globular α phases are more and bigger, and their laths are in full growth and increase dramatically; two hours later, when the sample undergoes aging treatment, its structure turns to be constituted by equiaxed α, basketweave α and transformed β phase, which results in the optimized textural parameters. Compared with as-deposited and annealed samples, the plasticity of the solution aging sample is enhanced significantly and the strength is decreased slightly, and their integrated mechanical properties improved remarkably. Its equiaxed structure performs coordinating function and its basketweave structure can reduce the dislocation pile-up to improve the plasticity. The microhardness is gradually increased in laser deposition TC4 alloy in the as-deposited, annealing, solution aging and solid-solution. But when the solution temperature rises to the transformation point, the microstructure of the sample rearranges after crystallizing, leading to marked decline in microhardness.