CoCrFeNiCu高熵合金涂层的激光熔覆制备及其组织和耐磨性能研究
Preparation,microstructure and wear resistance properties of CoCrFeNiCu high-entropy alloy coating by laser cladding
章伟 1束学道 1邓益民1
作者信息
- 1. 宁波大学 机械工程与力学学院,浙江 宁波 315211;浙江省零件轧制成形技术研究重点实验室,浙江 宁波 315211
- 折叠
摘要
采用同步送粉的方法在 45 号钢表面通过激光熔覆制备了 CoCrFeNiCu高熵合金涂层,系统探究了激光功率对激光熔覆CoCrFeNiCu高熵合金涂层组织及耐磨性能的影响,利用X射线衍射仪(XRD)、光学显微镜(OM)、扫描电镜(SEM)、电子能谱(EDS)、维氏硬度计、多功能摩擦磨损试验机,对不同功率下高熵合金涂层的组织、相组成结构、力学性能等进行了表征与测试.结果显示,在不同激光功率下,涂层的相结构只有 FCC 相,表明激光功率并未改变涂层的相组成结构.随着激光功率的增大,涂层顶部由枝晶向胞状晶转变,底部由柱状晶向胞状晶再向柱状晶转变,在 1700W 下涂层获得的晶粒较均匀致密;随着功率继续增大,晶粒有长大趋势;涂层的显微硬度先升高后降低,在 1700W 达到最高值 202 HV0.2,在 1700W 下涂层的磨损体积仅有0.03856 mm3,耐磨性达到最佳.
Abstract
CoCrFeNiCu high-entropy alloy coating was prepared by laser cladding on the surface of 45 steel with synchronous powder feeding method.The effects of laser power on the microstructure and wear resistance properties of CoCrFeNiCu high-entropy alloy coating were systematically investigated.The microstructure,phase composition and mechanical properties of the high entropy alloy coating were characterized and tested by X-ray diffractometer(XRD),optical microscope(OM),scanning electron microscope(SEM),energy dispersive spectrometer(EDS),Vickers hardness tester and multifunctional friction and wear testing machine.The results show that the coating is of only FCC phase under different laser power,indicating that the laser power does not change the phase composition of the coating.With the increase of laser power,the upper part of the coating changes from dendrites to cellular crystals,and the lower part changes from columnar crystals to cellular crystals and then to columnar crystals again.The crystal grains of the coating are uniform and dense at 1700 W of laser power.As the power increases,the grain size tends to grow as well.With the increase of laser power,the microhardness of the coating increases first and then decreases gradually,with the highest value being 202 HV0.2 at 1700 W of laser power.At 1700 W of laser power,the wear volume of the coating is only 0.03856 mm3,and the wear resistance reaches the best.
关键词
高熵合金/激光熔覆/微观组织/耐磨性Key words
high entropy alloy/laser cladding/microstructure/wear resistance引用本文复制引用
基金项目
宁波市"科技创新2025"重大专项(2022Z015)
宁波市重大科技专项(2022Z055)
出版年
2024
NETL
NSTL
万方数据