Mn含量对激光熔覆FeCoCrNiMn_(x)高熵合金涂层高温摩擦学性能的影响  

Effect of Mn Content on High-temperature Tribological Properties of Laser Cladding FeCoCrNiMn_(x) High-entropy Alloy Coatings

作　　者：谢晓明 沈鹰[2] 刘秀波 朱正兴 李明曦 XIE Xiaoming;SHEN Ying;LIU Xiubo;ZHU Zhengxing;LI Mingxi(Hunan Province Key Laboratory of Materials Surface/Interface Science&Technology,Central South University of Forestry&Technology,Changsha 410004,China;School of Aeronautics and Astronautics,Nanchang Institute of Technology,Nanchang 330044,China;Agriculture Equipment Institute of Hunan,Changsha 410125,China)

机构地区：[1]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 [2]南昌理工学院航天航空学院,南昌330044 [3]湖南省农业装备研究所,长沙410125

出　　处：《材料导报》2024年第23期184-192,共9页Materials Reports

基　　金：国家自然科学基金(52075559);湖南省重点研发计划项目(2022GK2030);湖南省农业科技创新资金项目(2022CX131)。

摘　　要：高熵合金涂层在提高钢基体的耐磨减摩性能方面具有巨大潜力,为探究不同Mn含量对激光熔覆FeCoCrNiMn_(x)高熵合金涂层高温摩擦学性能的影响,利用激光熔覆技术成功在Q235钢表面制备了FeCoCrNiMn^(x)(x=0,0.25,0.5,0.75,1.0)五种高熵合金涂层。通过XRD、SEM和EDS等表征方法,以及高温摩擦磨损试验等性能测试手段,对涂层的相组成、微观形貌以及高温摩擦学性能进行了系统分析,并探讨了其在高温下的耐磨减摩机理。结果表明:五种高熵合金均形成了简单的固溶体相,并无复杂相生成。相比于基材,五种涂层在高温下的耐磨减摩性能均得到显著提升。随着Mn含量的增加,涂层的平均摩擦系数呈先下降再上升的趋势,但均低于不含Mn元素的涂层。对于高温耐磨性能,五种涂层的磨损率随Mn含量的增加呈阶梯式下降。当x=1时,磨损率为最低的2.71×10^(-4)mm^(3)/(N·m),相比于基材和不含Mn元素的涂层分别降低了61.2%和33.9%。涂层在高温下的磨损形式由氧化磨损和磨粒磨损主导。High-entropy alloy coatings have great potentialability to improve the wear-resistant and friction-reducing properties of steel substrates.In order to investigate the effects of different Mn contents on the high-temperature tribological properties of laser-cladding-coated FeCoCrNiMn_(x) high-entropy alloy coatings,five high-entropy alloy coatings of FeCoCrNiMn_(x)(x=0,0.25,0.5,0.75,1.0)were successfully prepared on the surface of Q235 steel using laser cladding technology.The phase composition,micro-morphology and high-temperature tribological properties of five coa-tings were systematically analyzed by characterization and performance testing methods,such as XRD,SEM,EDS and high-temperature friction-wear testing,then their wear-resistant and friction-reducing mechanisms at high temperatures were discussed.The results show that all five high-entropy alloys formed simple solid solution phases and no complex phases were generated.Compared to Q235 steel,five coatings have significantly improved wear and friction reduction properties at high temperature.The average friction coefficients of coatings decrease firstly and then increase with the increasing of Mn content,but the average friction coefficients of all coatings containing Mn element were lower than that without Mn element.To high temperature wear resistance,five coatings’wear rates showed an overall decreasing trend with increasing of Mn content.Among 5 kinds of coatings with Mn element,the one with x=1 got the lowest wear rate of 2.71×10^(-4)mm^(3)/(N·m),which is reduced by 61.2% and 33.9% compared to substrate and the coating without Mn element,respectively,and the wear mechanisms of five coatings at high temperature are dominated by abrasive wear and oxidative wear.

关 键 词：激光熔覆 高熵合金 MN掺杂 高温摩擦学性能 磨损机制 

分 类 号：TG146[一般工业技术—材料科学与工程]