摘要
2Cr13不锈钢常被用作汽轮机叶片、风机叶片、透平机叶片等部件的原材料,由于其服役在恶劣的工作环境中,常常受到沙粒、炉尘颗粒等硬质相颗粒的冲蚀,表面易出现疲劳失效。针对此问题,采用Fe-Cr-Ni铁基粉末,依托激光合金化技术在2Cr13不锈钢表面制备铁基涂层,并尝试在Fe-Cr-Ni粉末中添加WC陶瓷硬质相,以期进一步提高试样的抗冲蚀性能。利用XRD物相检测、EDS元素分析、显微硬度对比、摩擦磨损、抗冲蚀等实验手段对合金化试样展开了微观组织和表面性能分析。研究结果表明:Fe-Cr-Ni涂层中主要物相由Fe-Ni固溶体、Fe-Cr固溶体、Ni-Cr-Fe元合金组成,Fe-Cr-Ni涂层显微硬度最大值可达530HV0.5,摩擦系数约为0.15,相对耐磨性为0.44;添加WC硬质相后涂层中晶体明显细化,涂层中新生成了碳化物Cr_(23)C_(6),并检测有WC硬质相的存在,硬度值最大值提高到590HV0.5,摩擦系数降低到0.13,相对耐磨性提高到0.62;Fe-Cr-Ni试样抗冲蚀能力较基材有所增强,添加WC硬质相后试样的抗冲蚀能力进一步提高,失重量呈近似直线的趋势。
2Cr13 stainless steel is often used as the raw material of turbine blade,fan blade,turbine blade and other components.Because it is used in the harsh working environment,it is often eroded by hard phase particles such as sand and furmace dust particles,and the surface is prone to fatigue failure.To address this problem,Fe-Cr-Ni iron-based powder was used to prepare an iron-based coating on the surface of 2Cr13 stainless steel by laser alloying technology,and WC ceramic hard phase was added to the Fe-Cr-Ni powder for improving the erosion resistance of the specimens.The microstructure and surface properties of the alloyed specimens are analyzed by XRD phase detection,EDS analysis,microhardness contrast,friction and wear,and erosion resistance.The results show that the main phase of Fe-Cr-Ni coating is composed of Fe-Ni solid solution,Fe-Cr solid solution and Ni-Cr-Fe element aloy.The maximum microhardness of Fe-Cr-Ni coating can reach 530HV0.5,the friction cofficient is about 0.15,and the relative wear resistance is 0.44.After the addition of WC hard phase,the crystal in the coating is obviously refined,a new carbide Cr_(23)C_(6)is formed in the coating,and the presence of WC hard phase is detected.The maximum hardness value increases to 590HV0.5,the friction cofficient decreases to 0.13,and the relative wear resistance increases to 0.62.The erosion resistance of Fe-Cr-Ni sample is enhanced compared with that of the substrate,and the erosion resistance of the sample is further improved after the adition of WC hard phase,and the weight loss shows an approximate linear trend.
作者
刘占琪
付宇明
谢印凯
郑丽娟
LIU Zhanqi;FU Yuming;XIE Yinkai;ZHENG Lijuan(School of Mechanical Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China)
出处
《燕山大学学报》
CAS
北大核心
2024年第6期484-492,518,共10页
Journal of Yanshan University
基金
河北省自然科学基金资助项目(E2021203218)。
