WC和Al2O3对氩弧熔覆FeAlCoCrCuTi0.4高熵合金涂层组织和耐冲蚀性能影响

Effects of WC and Al2O3 on the microstructure and erosion wear resistance of FeAlCoCrCuTi0.4 high-entropy alloy coating by argon arc cladding

利用氩弧熔覆技术制备了FeAlCoCrCuTi0.4,WC/Al2O3-FeAlCoCrCuTi0.4高熵合金涂层,并通过XRD,SEM,EDS,硬度测试和冲蚀磨损测试等方法,探究了WC和Al2O3的添加对FeAlCoCrCuTi0.4高熵合金涂层显微组织和性能的影响.结果表明,通过氩弧熔覆技术所制备的合金涂层表面成形性良好,无孔洞、裂纹等缺陷产生,与基体呈高强度冶金结合.WC和Al2O3的添加对涂层稀释率的降低有显著作用.三种涂层都是主要由Bcc相(Fe-Cr固溶体)构成,晶粒以胞状树枝晶形式存在.添加WC后,晶粒细化明显,在各种强化作用下涂层硬度为685.8HV.且WC和Al2O3的添加显著提高了涂层耐冲蚀磨损性能,耐磨性几乎可以达到FeAlCoCrCuTi0.4高熵合金涂层的2倍.

FeAlCoCrCuTi0.4,WC/Al2O3-FeAlCoCr CuTi0.4 high-entropy alloy (HEA) coating had been cladded by means of argon arc cladding.The effects of WC and Al2O3 on microstructure and properties of FeAlCoCrCuTi0.4 high entropy alloy coatings were investigated by means of XRD,SEM,EDS,hardness testing and erosion wear testing.The results show that the alloy coating prepared by argon arc cladding has good formability,no holes,cracks and other defects,and high strength metallurgical bonding with the matrix.The addition of WC and Al2O3 has a significant effect on reducing the dilution rate of the coating.The three kinds of coatings are mainly composed of BCC phase (Fe-Cr solid solution),and the grains exist in the form of cellular dendrites.After adding WC,the grain size is obviously refined,and the hardness of the coating is 685.8 HV under various strengthening effects.The addition of WC and Al2O3 significantly improved the erosion wear resistance of the coating,and the wear resistance could almost reach 2 times of that of FeAlCoCrCuTi0.4 high entropy alloy coating.