激光熔覆FeCoCrNi系高熵合金涂层的组织及高温摩擦学性能
Microstructure and high temperature tribological properties of laser cladding FeCoCrNi-based high-entropy alloy coatings
查看参考文献31篇
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文摘
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高熵合金涂层在提高不锈钢基材的耐磨性方面具有巨大的潜力。为探究Cu/Si两种元素掺杂对FeCoCrNi高熵合金涂层组织及高温摩擦学性能的影响,采用激光熔覆技术在304不锈钢表面制备出FeCoCrNiCux和FeCoCrNiSix系列高熵合金涂层。采用XRD,SEM,EDS等手段表征了涂层的微观组织及物相分布,通过高温摩擦磨损试验机测试了涂层的高温摩擦学性能。结果表明:在合适的激光熔覆工艺参数下,FeCoCrNiCux和FeCoCrNiSix高熵合金涂层均形成了单一的FCC型固溶体,与基体呈良好的冶金结合;Cu元素的加入降低了FeCoCrNi涂层表面硬度,但由于涂层热导率提高,界面结合情况改善;Si元素的加入促进了晶粒细化,提高了涂层表面硬度;在600℃下,Cu/Si元素的加入对涂层的摩擦学性能均有明显改善,其中FeCoCrNiCu及FeCoCrNiSi涂层的摩擦因数分别为0.24和0.19,磨损率分别为1.58× 10~(-4) mm~3·N~(-1)·m~(-1)和6.77×10~(-5) mm~3·N~(-1)·m~(-1),相比于FeCoCrNi涂层分别降低了56.1%和81.9%。 FeCoCrNiCu涂层主要磨损机制为氧化磨损、疲劳磨损及轻微磨粒磨损,而FeCoCrNiSi涂层为氧化磨损。 |
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其他语种文摘
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High-entropy alloy coatings show great potential for improving the wear resistance of the stainless steel substrate.To investigate the effects of Cu/Si doping on the microstructure and high temperature tribological properties of FeCoCrNi high-entropy alloy coating,FeCoCrNiCux and FeCoCrNiSixseries of high-entropy alloy coatings were prepared on the 304stainless steel by laser cladding.The microstructure and phase distribution of the coatings were characterized by XRD,SEM and EDS,and the high temperature tribological properties of the coatings were tested by a high temperature friction and wear tester.The results show that both FeCoCrNiCuxand FeCoCrNiSixhigh entropy alloy coatings form a single FCC-type solid solution with good metallurgical bonding to the substrate under suitable laser cladding parameters.The addition of Cu reduces the surface hardness of FeCoCrNi coatings,but improves the metallurgical bonding due to the increase of thermal conductivity of the coating;the addition of Si promotes grain refinement and improves the surface hardness of the coating.At 600℃,the addition of Cu/Si elements significantly improves the tribological properties of the coating,with the coefficients of friction of 0.24and 0.19for FeCoCrNiCu and FeCoCrNiSi coatings,respectively,and the wear rates are 1.58×10~(-4) mm~3·N~(-1)·m~(-1) and 6.77×10~(-5) mm~3·N~(-1)·m~(-1), respectively,which are 56.1%and 81.9%lower than FeCoCrNi coating.The main wear mechanisms of FeCoCrNiCu coating are oxidation wear,fatigue wear and slightly abrasive wear,while FeCoCrNiSi coating is oxidation wear. |
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来源
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材料工程
,2023,51(3):78-88 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000620
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关键词
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激光熔覆
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FeCoCrNi系高熵合金涂层
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Cu/Si掺杂
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组织
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高温摩擦学性能
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地址
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中南林业科技大学, 材料表界面科学与技术湖南省重点实验室, 长沙, 410004
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安徽工业大学, 先进金属材料绿色制备与表面技术教育部重点实验室, 安徽, 马鞍山, 243002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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湖南省重点研发计划项目
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湖南省自然科学基金
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先进金属材料绿色制备与表面技术教育部重点实验室开放基金
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文献收藏号
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CSCD:7445146
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