摘要
采用激光熔覆技术在Q345钢表面制备FeCrNiCoCuAlx(x=0, 1, 2, 3)高熵合金涂层。通过XRD,SEM及冲蚀磨损等实验方法研究高熵合金涂层的组织结构与性能。结果表明:随着Al含量的增加,高熵合金涂层由简单结构的FCC和BCC混合固溶体逐渐转变成全部的BCC结构,涂层的硬度也随之增大,最高可达580HV。在3.5%NaCl溶液中,涂层的腐蚀电流密度随着Al含量的增加先降低后提高,且当x=1时涂层具有最好的耐蚀性。冲蚀磨损实验表明,当冲蚀角度由90°减小到30°时,冲蚀磨损量不降反升,表现出韧性材料的冲蚀特征。涂层的抗冲蚀性能随着Al含量的增加而增强,且冲蚀磨损机制由锻造挤压转变为以微切削和犁削为主。
FeCrNiCoCuAlx(x=0, 1, 2, 3) high-entropy alloy(HEA) coatings were prepared on Q345 steel by laser cladding. The effects of Al content on microstructure and properties of FeCrNiCoCuAlx HEA coatings were studied by XRD, SEM and erosion wear tests. The results show that the HEA coatings are mainly composed by simple FCC and BCC solid-solution phases. With the increase of Al addition, the microstructure is evolved gradually from FCC to BCC. And the hardness of the HEA coatings improves significantly and the maximum value is 580 HV. In 3.5%NaCl solution, the corrosion current density of FeCrNiCoCuAlx HEA coatings decreases firstly and then increases with the increase of Al addition. And the HEA coating has the best corrosion resistance at x=1. Meanwhile, the mass loss rate of HEA coating decreases in the erosion test when the impact angle is changed from 90° to 30°, exhibiting an erosion characteristic of ductile materials. The slurry erosion properties of the HEA coating increase with the increase of Al content, and the erosion wear mechanism is evolved from forging extrusion to ploughing and micro-cutting.
作者
鲍亚运
纪秀林
姬翠翠
赵建华
程江波
徐霖
BAO Ya-yun;JI Xiu-lin;JI Cui-cui;ZHAO Jian-hua;CHENG Jiang-bo;XU Lin(College of Mechanical&Electrical Engineering,Hohai University,Changzhou 213022,Jiangsu,China;Engineering Research Center of Dredging Technology(Ministry of Education),Hohai University,Changzhou 213022,Jiangsu,China;College of Mechanics&Materials,Hohai University,Nanjing 210098,China;Changshu Pufa No.2 Thermal Power Co.,Ltd.,Suzhou 215513,Jiangsu,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2019年第11期141-147,共7页
Journal of Materials Engineering
基金
国家自然科学基金面上项目(51875169,51505126)
中央高校基本科研业务费专项资金(2016B49814)
江苏省普通高校学术学位研究生创新计划项目(KYLX16_0712)
关键词
激光熔覆
高熵合金
组织结构
耐蚀性
冲蚀磨损
laser cladding
high-entropy alloy
microstructure
corrosion resistance
erosion wear
