Cr_(3)C_(2)含量对Fe_(0.5)CoCr_(0.5)Mo_(0.3)Ni高熵合金重熔涂层组织性能的影响  

Effect of Cr_(3)C_(2)Content on Microstructure and Properties of Fe_(0.5)CoCr_(0.5)Mo_(0.3)Ni High-entropy Alloy Remelting Coating

作　　者：李永凤 刘美芹 王丽霞 李小颖 吴宁 章健 LI Yongfeng;LIU Meiqin;WANG Lixia;LI Xiaoying;WU Ning;ZHANG Jian(College of Mechanical and Electrical Engineering,Shandong University of Aeronautics,Shandong Binzhou 256600,China;Binzhou Special Equipment Inspection&Research Institute,Shandong Binzhou 256699,China;Binzhou Ecological Environment Service Center,Shandong Binzhou 256606,China)

机构地区：[1]山东航空学院机电工程学院,山东滨州256600 [2]滨州市特种设备检验研究院,山东滨州256699 [3]滨州市生态环境服务中心,山东滨州256606

出　　处：《表面技术》2024年第21期176-186,共11页Surface Technology

基　　金：国家自然科学基金(52075047);泰山学者青年专家(tsqn202211245);山东省自然科学青年基金(ZR2021QE204)。

摘　　要：目的研究Cr_(3)C_(2)对高熵合金涂层物相组成和组织的影响,提高涂层的耐磨性和耐腐蚀性,延长工件的使用寿命。方法采用激光熔覆技术在45#钢表面制备Fe_(0.5)CoCr_(0.5)Mo_(0.3)Ni-xCr_(3)C_(2)高熵合金(HEAs)复合涂层,并对其进行一次重熔处理。通过X射线衍射仪(XRD)、扫描电镜(SEM)、能谱仪(EDS)、显微硬度计、摩擦磨损试验机和电化学工作站等设备研究涂层的物相组成、显微组织、显微硬度、耐磨性和耐腐蚀性能。结果涂层主要由面心立方(FCC)相和(Cr,Fe)_(23)C_(6)相组成,FCC相作为主相,是由Fe-Co-Cr-Mo-Ni构成的高熵合金,(Cr,Fe)_(23)C_(6)作为加强相,与FCC形成共晶组织。Cr_(3)C_(2)加入量的改变会影响物相的组成、含量和显微组织的形貌,随着Cr_(3)C_(2)的增加,晶粒的形貌由粗大的树枝晶过渡到细小块状和圆柱状的枝状晶,且枝状晶的尺寸逐渐减小。Cr_(3)C_(2)的加入还会提高涂层的显微硬度,增加耐磨性,当Cr_(3)C_(2)加入量达到20%(质量分数)时,涂层的显微硬度从260HV0.2左右提高到430HV0.2,同时摩擦因数为0.45左右。该涂层同时具有最小自腐蚀电流密度和最高自腐蚀电位,分别为37.25 nA/cm^(2)、–0.15 V,而未加Cr_(3)C_(2)的高熵合金涂层的自腐蚀电流密度为4929.50 nA/cm^(2),自腐蚀电位为–0.55 V。结论当涂层中Cr_(3)C_(2)的加入量不超过20%时,Cr_(3)C_(2)的加入量越大,生成的(Cr,Fe)_(23)C_(6)就越多,涂层的耐磨性越好。Cr_(3)C_(2)的加入还能够降低涂层的自腐蚀电流,提高自腐蚀电位,有利于耐腐蚀性的提高。High-entropy alloy(HEA)is an alloy formed by five or more main metal elements.Due to its many excellent properties,it has been widely concerned in the fields of material science and engineering application.However,the presence of a multitude of elements within these alloys can lead to the formation of brittle intermetallic compounds or intricate intermediate phases,such as the laves phase,which leads to the deterioration of the alloy properties.To expedite the industrial utilization of HEAs,it is imperative to refine their properties through various methods to enhance their performance and mitigate existing deficiencies.Drawn from metallurgical expertise,carbon and carbides are recognized for their pivotal role in modulating the properties of steel.It is anticipated that these elements will exert a substantial effect on the attributes of HEAs as well.It is concluded that carbon and carbide will also have a significant impact on the properties of HEAs.Therefore,the work aims to prepare HEAs-carbide composite coating by adding different contents of Cr_(3)C_(2)to Fe_(0.5)CoCr_(0.5)Mo_(0.3)Ni HEAs,and discuss the effects of Cr_(3)C_(2)on the phase composition,microstructure,microhardness,wear resistance and corrosion resistance of the coating.Before coating fabrication,the powder with the ratio of Fe_(0.5)CoCr_(0.5)Mo_(0.3)Ni-xCr_(3)C_(2)(x=0%,7.5%,10%,20%)was mechanically mixed by planetary ball mill and preset on the polished 45#steel plate.The coating was prepared by 3 kW laser cladding equipment(LATEC LOM-3000)under the condition of 1.5 kW laser power,and remelted by 0.8 kW laser beam.The microhardness of cladding layer was measured by microhardness tester(HXD-1000TMC/LCD).The phase composition of different coatings was qualitatively analyzed by X-ray diffractometer(Bruker,D8 Advanced,XRD).The microstructure of the coating was observed by scanning electron microscope(Nova Nano 450 SEM),and the distribution of elements in the coating was quantitatively analyzed by energy dispersive spectrometer(EDS).Impedance and

关 键 词：高熵合金涂层 物相组成 显微组织 显微硬度 耐磨性 耐腐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]