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電子束熔絲成形Ti6Al4V單道沉積體的工藝研究：幾何尺寸、顯微組織，成分及硬度
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南京航空航天大學(xué) 材料科學(xué)與技術(shù)學(xué)院

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Parametric investigation on Ti6Al4V single beads produced by electron beam freeform fabrication: Geometry, microstructure, composition and hardness
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School of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics

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NSFC(Grant No.51975286), Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX18_0272); Opening Project of Jiangsu Key Laboratory of Advanced Metallic Materials; Priority Academic Program Development of Jiangsu Higher Education Institution

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    摘要:

    采用電子束熔絲成形工藝制備了Ti6Al4V單道沉積體，并研究了送絲速度、束流功率和行進(jìn)速度等工藝參數(shù)下沉積體的幾何尺寸、顯微結(jié)構(gòu)、成分以及硬度的變化。結(jié)果表明，加快送絲速度有利于提高沉積效率及成形精度，但需要足夠的熱輸入以保證沉積順利。當(dāng)送絲速率、行進(jìn)速度增大或束流功率減小時，由于熔池溫度和尺寸的減小，可以獲得較窄的柱狀β晶及其內(nèi)部細(xì)小的組織特征，同時鋁Al蒸發(fā)損耗降低。因此，采用這些工藝制備的沉積體具有更高的硬度。本文揭示了工藝參數(shù)與沉積體工藝結(jié)果之間關(guān)系，為制造具有可靠組織結(jié)構(gòu)和力學(xué)性能的多層構(gòu)件提供有價值的指導(dǎo)。

    Abstract:

    Ti6Al4V single beads were prepared by electron beam freeform fabrication (EBF3) to investigate their geometry, microstructure, composition and the resulting hardness in terms of the wire-feed rate, beam power and travel speed. Results showed that an increased wire-feed rate favored to increase the deposition efficiency and geometry accuracy, but it required an affordable heat input to success in deposition. The narrowed columnar β grains filled with the fine microstructural features inside and the decreased Al evaporation loss were available at an increased wire-feed rate/travel speed or a decreased beam power, which was attributed to the decreased temperature and dimension of molten pool. Therefore, the beads produced at such process variables possess the increased hardness. This investigation reveals the correlation between the process parameters and the process outcomes of deposited beads, which offers a valuable guidance for accurate manufacturing of multi-layered components with reliable microstructure and mechanical properties.

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陶學(xué)偉,姚正軍,張莎莎.電子束熔絲成形Ti6Al4V單道沉積體的工藝研究：幾何尺寸、顯微組織，成分及硬度[J].稀有金屬材料與工程,2020,49(9):2913~2919.[Xuewei Tao, Zhengjun Yao, Shasha Zhang. Parametric investigation on Ti6Al4V single beads produced by electron beam freeform fabrication: Geometry, microstructure, composition and hardness[J]. Rare Metal Materials and Engineering,2020,49(9):2913~2919.]
DOI：10.12442/j. issn.1002-185X. E20190090

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  • 收稿日期:2019-06-11
  • 最后修改日期:2019-11-12
  • 錄用日期:2019-11-12
  • 在線發(fā)布日期: 2020-10-15
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