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激光熔化沉積制造γ-TiAl合金的組織與性能
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1. 沈陽工業(yè)大學(xué)材料科學(xué)與工程學(xué)院

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智能化增材制造系統(tǒng)平臺(tái)(2017YFB1103000)


Microstructure and Properties of γ-TiAl Alloy Fabricated by Laser Metal Deposition
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School of Materials Science and Engineering,Shenyang University of Technology

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Intelligent Additive Manufacturing System Platform (2017YFB1103000)

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    摘要:

    通過激光熔化沉積制造技術(shù)成功制備了X×Y×Z(40 mm×5 mm×60 mm)的Ti-48Al-2Cr-2Nb合金沉積樣品。利用光學(xué)顯微鏡(OM)、掃描電子顯微鏡(SEM)、X射線衍射(XRD)、透射電子顯微鏡(TEM)和背散射衍射(EBSD)分析了沉積樣品的顯微組織、相組成、晶粒取向及斷口形貌;利用維氏硬度計(jì)測(cè)量了沉積樣品不同位置上的硬度分布;利用拉伸機(jī)測(cè)量了沉積樣品在Z向的拉伸性能。 結(jié)果表明,在最佳工藝參數(shù)條件下獲得了成形良好的沉積樣品,經(jīng)過滲透檢測(cè)后發(fā)現(xiàn)表面無裂紋。沉積樣品的顯微組織由γ+α2組成的層片狀晶團(tuán)及少量塊狀γ-TiAl相組成。在沉積狀態(tài)下,沿試樣Z方向的室溫拉伸強(qiáng)度為425MPa,延伸率為3.3%。拉伸試樣的斷口形貌為準(zhǔn)解理斷口。

    Abstract:

    The deposited sample of x × y × z (40 mm × 5 mm × 60 mm) Ti-48Al-2Cr-2Nb alloy was successfully fabricated by laser metal deposition. The microstructure, phase composition, grain orientation and fracture morphology of the deposited sample were analyzed by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD), transmission electron microscope (TEM) and backscattering diffraction (EBSD). The hardness distribution at different positions of the deposited sample was measured by Vickers hardness tester. The tensile properties of the deposited sample in Z direction were measured by tensile machine. The results show that the well-formed deposited sample is obtained under the optimum process parameters, and no surface cracks are found after penetration detection. The microstructure of the deposited sample is composed of α2+γ lamellar colony and a small amount of bulk γ phase. For as-deposited γ-TiAl alloy, the room-temperature tensile strength along the Z direction is 425 MPa and the elongation is 3.3%. The fracture morphology of tensile specimen is quasi-cleavage fracture.

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引用本文

劉占起,馬瑞鑫,徐國建,鄭文濤.激光熔化沉積制造γ-TiAl合金的組織與性能[J].稀有金屬材料與工程,2020,49(6):1925~1930.[Liu Zhanqi, Ma Ruixin, Xu Guojian, Zheng Wentao. Microstructure and Properties of γ-TiAl Alloy Fabricated by Laser Metal Deposition[J]. Rare Metal Materials and Engineering,2020,49(6):1925~1930.]
DOI:10.12442/j. issn.1002-185X.20190165

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  • 收稿日期:2019-02-27
  • 最后修改日期:2019-03-15
  • 錄用日期:2019-04-10
  • 在線發(fā)布日期: 2020-07-09
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