摘要
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FeCoCrNiCu_(x)和FeCoCrNiSi_(x)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,FeCoCrNiCu_(x)和FeCoCrNiSi_(x)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。
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,FeCoCrNiCu_(x)and FeCoCrNiSi_(x)series of high-entropy alloy coatings were prepared on the 304 stainless 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 FeCoCrNiCu_(x)and FeCoCrNiSi_(x)high 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 0.24 and 0.19 for 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.
作者
朱正兴
刘秀波
刘一帆
孟元
周海滨
张世宏
ZHU Zhengxing;LIU Xiubo;LIU Yifan;MENG Yuan;ZHOU Haibin;ZHANG Shihong(Hunan Province Key Laboratory of Materials Surface/Interface Science&Technology,Central South University of Forestry&Technology,Changsha 410004,China;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials(Ministry of Education),Anhui University of Technology,Maanshan 243002,Anhui,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2023年第3期78-88,共11页
Journal of Materials Engineering
基金
国家自然科学基金(52075559)
湖南省重点研发计划项目(2022GK2030)
湖南省自然科学基金(2021JJ31161)
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(GFST2021KF03)。
作者简介
通讯作者:刘秀波(1968—),男,教授,博士生导师,主要研究方向为材料表面工程与摩擦学、激光加工,联系地址:湖南省长沙市韶山南路498号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(410004),E-mail:liuxiubosz@163.com。
