激光熔覆FeCrSi_(x)NiCoC涂层高温耐磨性能  

Wear Resistance of Laser Cladding FeCrSixNiCoC Coating at High Temperature

作　　者：马汝成 贵永亮 龙海洋 马文有 李福海 邓朝阳 闫星辰 MA Rucheng;GUI Yongliang;LONG Haiyang;MA Wenyou;LI Fuhai;DENG Zhaoyang;YAN Xingchen(Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology,Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,China;National Engineering Laboratory for Modern Materials Surface Engineering Technology,Guangzhou 510650,China;College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]广东省科学院新材料研究所广东省现代表面工程技术重点实验室,广州510650 [2]现代材料表面工程技术国家工程实验室,广州510650 [3]华北理工大学冶金与能源学院,唐山063210

出　　处：《中国表面工程》2023年第1期179-188,共10页China Surface Engineering

基　　金：广东特支计划(2019BT02C629);河北省杰出青年科学基金(E2019209473);河北省高校百名优秀创新人才支持计划(Ⅲ)(SLRC2019030);河北省人才工程培养(A201905010);广州市重点领域研发计划(202007020008);广东省科学院发展专项资金(2022GDASZH-2022010107,2022GDASZH-2022010203-003)资助项目

摘　　要：Si含量对Fe基合金高温耐磨性能影响机理研究已有很多,但尚缺乏Si含量对Fe基涂层高温耐磨性能的研究.采用激光熔覆技术制备不同Si含量(5wt.%、10wt.%、15wt.%)的FeCrSi_(x)NiCoC涂层,在温度为500℃和载荷200 N的条件下,测试FeCrSi_(x)NiCoC涂层高温耐磨性能.结合X射线衍射仪(XRD)、金相显微镜(OM)、扫描电子显微镜(SEM)、能谱分析仪(EDS)分析涂层显微组织、相组成和磨损机理.结果表明:随着Si含量增加,涂层中γ-Fe相(Si以固溶方式存在于γ-Fe相中)向金属硅化物Fe3Si相转变,显微组织也由树枝晶向等轴晶转变,涂层硬度由312±21.7 HV0.5增加至588±31.3HV0.5.在温度500℃和载荷200 N下的摩擦磨损试验中,Si含量为10%的涂层磨损率最低,高温耐磨性能最好,其磨损机理主要为黏着磨损和氧化磨损.通过优化Fe基合金中Si含量得到耐磨性能良好的涂层,可对该类涂层的开发、制备和应用提供一定的技术支持.Fe-based alloys are among the most important materials for engineering applications owing to their low cost and high hardness/strength,and wear and corrosion resistance.However,with the development of industry,the working conditions of mechanical parts have deteriorated.Therefore,it is essential to develop Fe-based alloy materials with enhanced wear and corrosion resistance,especially at high temperatures.The addition of alloying elements,such as Si,can significantly improve the high-temperature performance of Fe-based alloys.A typical example is high-silicon cast iron.Many studies have been conducted on the influence of the Si content on the high-temperature properties of Fe-based alloys.However,studies on the high-temperature properties of Fe-based repair coatings with Si content remain few.In this work,FeCrSi,NiCoC coatings with different Si content(5 wt.%,10 wt.%,and 15 wt.%Si,called Sis,Sio,and Siis,respectively)were prepared using laser cladding technology after a systematic study of laser parameters.The metallurgical bond,microstructure,phase,and hardness of the coatings were studied using X-ray diffraction,metallographic microscopy,scanning electron microscopy,and energy dispersive analysis.The high-temperature wear resistance of FeCrSi,NiCoC coatings was tested at 500°C and a load of 200 N.The results show that the FeCrSi,NiCoC coatings had no cracks and formed good metallurgical bonds with the substrate.With the increase in the Si content,the-Fe phase in the coating(Si exists in the-Fe phase as a solid solution)transformed into the metal silicide FesSi phase,and the microstructure gradually changed from columnar dendrites to equiaxed grains.The hardness increased from 312±21.7 HVo.s to 588±31.3HVo.5,which indicates that the increase in Si content has a significant impact on the phase,microstructure,and hardness of the coatings.In the friction and wear tests,the FeCrSi,NiCoC coatings showed excellent high-temperature wear resistance,much better than that of the substrate.In addition,owing to the solid

关 键 词：激光熔覆技术 FeCrSixNiCoC涂层 微观组织 高温磨损性能 

分 类 号：TG174[金属学及工艺—金属表面处理]