车用不锈钢表面激光原位合成FeCrCoNi涂层组织及耐磨性
Microstructure and wear resistance of FeCrCoNi coating on automotive stainless steel surface synthesized by laser in situ
张连松 1苏涛 2沈思明3
作者信息
- 1. 内蒙古交通职业技术学院,内蒙古赤峰 024005
- 2. 南华大学机械工程学院,湖南衡阳 421001
- 3. 上汽大众汽车有限公司,上海 201805
- 折叠
摘要
为提升车用316不锈钢的表面硬度及耐磨性,采用激光熔覆原位合成法在316不锈钢表面制备FeCrCoNi高熵合金涂层.分别对FeCrCoNi高熵合金涂层的相组成、元素分布、显微硬度及耐磨性进行研究.结果表明:原位合成制备的FeCrCoNi高熵合金涂层无裂纹、气孔等缺陷,与基材呈现良好的冶金结合.FeCrCoNi高熵合金涂层由单一的FCC相组成,涂层组织为树枝晶.各元素分布均匀,无明显偏析.FeCr-CoNi高熵合金涂层的截面平均显微硬度约为283.7 HV,相较于316不锈钢基体提升了约50％.FeCrCoNi高熵合金涂层的平均摩擦因数分别为0.377和0.438,比磨损率分别为2.27×10-5 mm3/N·m和6.17×10,5 mm3/N·m,FeCrCoNi高熵合金涂层的磨损率降低了70％.FeCrCoNi高熵合金涂层的磨损机制为磨粒磨损.
Abstract
In order to improve the surface hardness and wear resistance of 316 stainless steel for vehicle used,FeCrCoNi high entropy alloy coating were prepared on the surface of 316 stainless steel by laser cladding in situ synthesis.The phase composition,element distribution,microhardness and wear resistance of FeCrCoNi high entropy alloy coating were studied.The results show that the FeCrCoNi high entropy alloy coating prepared in si-tu has no cracks,pores and other defects,and has good metallurgical bonding with the substrate.FeCrCoNi high en-tropy alloy coating is composed of a single FCC phase with dendrite and interdendrite structures.All elements are evenly distributed without obvious segregation.The microhardness of FeCrCoNi high entropy alloy coating is 287.3 HV,which is about 50％higher than that of 316 stainless steel substrate.The average friction coefficients of FeCrCoNi high entropy alloy coating are 0.377 and 0.438,respectively,and the wear rate of FeCrCoNi high en-tropy alloy coating is 70％lower than the wear rate of 2.27×10-5 mm3/N.m and 6.17×1 0-5 mm3/N·m,respectively.The wear mechanism of FeCrCoNi high entropy alloy coating is abrasive wear.
关键词
激光熔覆/原位合成/高熵合金/耐磨性/显微硬度Key words
laser cladding/in situ synthesis/high entropy alloy/wear/microhardness引用本文复制引用
基金项目
国家自然科学基金资助项目(51975270)
出版年
2024
NETL
NSTL
万方数据