等离子熔覆添加和内生联合WC颗粒增强铁基涂层的组织和性能  

Microstructure and properties of additional and in situ synthesized WC particle reinforced iron-based coatings prepared by plasma cladding

作　　者：张孟良 汤文博[1] 李百奇 王笑生 黎文强 王腾飞 Zhang Mengliang;Tang Wenbo;Li Baiqi;Wang Xiaosheng;Li Wenqiang;Wang Tengfei(School of Materials Science and Engineering,Zhengzhou University,Zhengzhou Henan 450001,China;Henan Academy of Coal Science and Technology Co.,Ltd.,Zhengzhou Henan 450001,China)

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450001 [2]河南省煤科院耐磨技术有限公司,河南郑州450001

出　　处：《金属热处理》2022年第2期200-205,共6页Heat Treatment of Metals

摘　　要：采用等离子熔覆技术,以铸造碳化钨、钨铁粉、镍包石墨和铁基合金粉为原材料,在Q235钢基体上制备了外加和内生联合WC颗粒增强铁基复合涂层,通过扫描电镜和能谱分析、X射线衍射、硬度测试和磨料磨损试验对其微观组织、物相组成、硬度和耐磨性能进行了表征。结果表明,在优化的工艺参数下,可以获得与基体冶金结合良好的涂层,硬质相除外加的WC颗粒,还有内生的WC、W_(2)C、W_(3)C、Fe_(3)W_(3)C和Fe_(2)W_(2)C等;随着混合粉末中除外加WC之外的W含量增加,熔池中合金液密度增大,可以减弱外加WC颗粒下沉;当W含量达到15%时,外加WC颗粒均匀分布在涂层中,没有团聚现象发生,且在外加WC颗粒周围有细小的原位WC颗粒生成,涂层的显微硬度和耐磨损性能显著提高,涂层的平均硬度约为1300 HV0.2,耐磨性为Q235钢基体的10倍。Additional and in situ synthesized WC particle reinforced iron-based composite coatings were fabricated on Q235 steel substrate by plasma cladding technique with raw material of iron based alloy powder,nickel-coated graphite,tungsten iron powder,and cast tungsten carbide.The microstructure,phase composition,hardness and wear resistance were examined by SEM,XRD,hardness test and abrasive wear test,respectively.The results show that the coating with good metallurgical bonding to substrate can be obtained under optimal process parameters.Except for added WC particles,the coating has hard phases such as WC,W_(2)C,W_(3)C,Fe_(3)W_(3)C and Fe_(2)W_(2)C,which are in situ synthesized.With the increase of W content in the mixed powder except for added WC particles,the density of the alloy liquid in the molten pool increases,which can reduce the sinking of the additional WC particles.When the content of W reaches 15%,the added WC particles are evenly distributed in the coating,and there is no agglomeration of WC particles in the coating.And there are fine in situ synthesized WC particles around the additional WC particles,and the microhardness and wear resistance of the coating are significantly improved.The average microhardness of the coating with W content of 15%is capable of reaching about 1300 HV0.2,the wear resistance is 10 times that of the Q235 steel matrix.

关 键 词：等离子熔覆 WC颗粒 外加和内生 显微组织 显微硬度 耐磨性 

分 类 号：TG421[金属学及工艺—焊接] TG135.6[一般工业技术—材料科学与工程]