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激光熔覆納米TiC增強AlCoCrFeNi高熵合金磨損及腐蝕性能研究
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1.新疆大學(xué)機械工程學(xué)院 新疆烏魯木齊;2.陽江市五金刀剪產(chǎn)業(yè)技術(shù)研究院 陽江 陽江市高功率激光應(yīng)用實驗室有限公司 陽江;3.蘭州理工大學(xué) 甘肅蘭州

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自治區(qū)科技支疆項目計劃(項目號2020E0264)海上風(fēng)電高速激光熔覆防腐涂層制備工藝及應(yīng)用(項目號SDZX2020009)；高端刀具超聲波振動能場輔助激光熔覆技術(shù)開發(fā)(項目號SDZX2019005)海上風(fēng)電厚板高功率激光焊接技術(shù)開發(fā)及應(yīng)用(項目號SDZX2019038)


Laser cladding of nano-TiC to enhance the wear and corrosion properties of AlcoCrFeNi high entropy alloy
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College of Mechanical Engineering, Xinjiang University

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    摘要:

    采用激光熔覆技術(shù)在 304 不銹鋼表層制備了納米 TiC 增強 AlCoCrFeNi 高熵合金涂層，利用掃描電鏡、能譜儀、X 射線衍射儀等設(shè)備系統(tǒng)研究了涂層的組織形貌、相結(jié)構(gòu)及元素分布；采用顯微硬度計、摩擦磨損儀、超景深顯微鏡和電化學(xué)工作站等設(shè)備表征了涂層的硬度分布、磨損特性及耐腐蝕性能。結(jié)果表明，類球形納米級 TiC 與棒狀微米級 TiC 沉淀相均勻分布在涂層 bcc（B2）相基體中。添加 TiC 增強相后，AlCoCrFeNi 高熵合金涂層的硬度比未添加 TiC 涂層的硬度提升了 15%；表層磨損率及磨損后表面單位面積粗糙度（Sa）分別較 AlCoCrFeNi 高熵合金涂層降低了 42% 和 18%，涂層中 TiC 增強相的彌散強化作用是涂層硬度、耐磨性提升的主要原因。添加 TiC 的 AlCoCrFeNi 高熵合金涂層較未添加 TiC 涂層的自腐蝕電流降低了約1個數(shù)量級，TiC 增強相使涂層表面形成致密的鈍化膜是其耐蝕性能好的主要原因。

    Abstract:

    Nano-TiC reinforced AlcoCrFeNi high entropy alloy coating was prepared on 304 stainless steel surface by laser cladding technique. The microstructure, phase structure and element distribution of the coating were systematically studied by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The hardness distribution, wear characteristics and corrosion resistance of the coatings were characterized by microhardness tester, friction and wear tester, ultra-depth of field microscope and electrochemical workstation. The results show that the quasi-spherical nano-TiC and rod-like micron TiC precipitates are uniformly distributed in the coated BCC (B2) matrix. The hardness of Alcocrfeni high entropy alloy coating increased by 15% after the addition of TiC phase compared with that without the addition of TiC. The surface wear rate and surface roughness per unit area (SA) decreased by 42% and 18%, respectively, compared with that of AlcoCrFeNi high entropy alloy coating. The dispersion strengthening effect of TiC reinforcing phase in the coating was the main reason for the improvement of coating hardness and wear resistance. The self-corrosion current of Alcocrfeni high entropy alloy coating with TiC is about one order of magnitude lower than that without TiC coating. The dense passivation film formed on the surface of the coating by TiC reinforcing phase is the main reason for its good corrosion resistance.

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韓晨陽,孫耀寧,徐一飛,張瑞華,陳玲娜.激光熔覆納米TiC增強AlCoCrFeNi高熵合金磨損及腐蝕性能研究[J].稀有金屬材料與工程,2022,51(2):607~614.[韓晨陽,Sun Yaoning, Xu Yifei, Zhang Ruihua, Chen Lingna. Laser cladding of nano-TiC to enhance the wear and corrosion properties of AlcoCrFeNi high entropy alloy[J]. Rare Metal Materials and Engineering,2022,51(2):607~614.]
DOI：10.12442/j. issn.1002-185X.20210121

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歷史
  • 收稿日期:2021-02-08
  • 最后修改日期:2021-03-19
  • 錄用日期:2021-03-25
  • 在線發(fā)布日期: 2022-03-09
  • 出版日期: 2022-02-28