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热处理对增材制造生物纯钛力学性能的影响
作者:
作者单位:

1.山东理工大学机械工程学院;2.山东新华医疗器械股份有限公司

基金项目:

国家重点研发计划项目(2018YFB1105900);淄博市校城融合发展计划项目(2018ZBXC154)


Effect of Heat Treatment on Mechanical Properties of Pure Titanium by Additive Manufacturing
Author:
Affiliation:

1.Institute of Mechanical Engineering,Shandong University of Technology,Zi’bo;2.Shandong Xinhua Medical Devices Co,Ltd,Zi’bo

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    摘要:

    选区激光熔化(Selective laser melting, SLM)能直接根据CAD模型制备形状复杂的个性化医用植入物。本文旨在研究SLM和后续热处理后生物纯钛(TA1)的显微组织和力学性能。结果表明,SLM打印后的TA1合金为针片状a′马氏体组织,且沿建造方向保留初始β柱状晶形貌;热处理后发生再结晶组织转变,形成等轴a晶粒,a晶粒长大过程中伴随孔洞的减小或闭合,使孔隙率明显下降。在真空环境下进行800℃退火可使合金在晶界和晶内析出细小的TiFe和TiO2相,这些析出相对晶界结构具有选择性。孔隙率的下降和TiFe/TiO2相的析出是真空热处理有效改善SLM制备的TA1材料力学性能的主要原因。

    Abstract:

    Selective laser melting (SLM) can directly produce personalized medical implants with complex shapes based on CAD models. The paper presents an investigate on the evolution of microstructure and mechanical properties of biological pure titanium (TA1) from SLM to subsequent heat treatment. The results show that the SLMed TA1 alloy possess needle-like martensite a′ and retained prior-β columnar morphology along the building direction. After heat treatment, recrystallized equiaxed a grains are formed and the reduced porosity was found due to pores volume decrease or pores closure. In addition, the precipitations of fine TiFe and TiO2 were observed along grain boundary or within grains in the samples treated by vacuum annealing at 800 ℃. They precipitate selectivity along the grain boundaries with different character. The subsequent heat treatments, especially vacuum annealing, significantly improve the mechanical properties of the SLMed TA1 samples, which is ascribed to combined effects of porosity decrease and the precipitation of TiFe/TiO2 phase upon annealing.

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申发磊,夏维龙,娄殿军,郭娜娜,李昊卿,刘树裕,方晓英.热处理对增材制造生物纯钛力学性能的影响[J].稀有金属材料与工程,2022,51(1):232~240.[Shen Falei, Xia Weilong, Lou Dianjun, Guo Nana, Li Haoqing, Liu Shuyu, Fang Xiaoying. Effect of Heat Treatment on Mechanical Properties of Pure Titanium by Additive Manufacturing[J]. Rare Metal Materials and Engineering,2022,51(1):232~240.]
DOI:10.12442/j. issn.1002-185X.20210039

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  • 收稿日期:2021-01-13
  • 最后修改日期:2021-03-25
  • 录用日期:2021-04-15
  • 在线发布日期: 2022-02-09
  • 出版日期: 2022-01-28