WC增强Fe基合金熔覆层的组织与湿砂磨损特性

发布时间：2018-06-17 20:45

本文选题：Fe基合金 + 涂层　；参考：《中国表面工程》2015年01期

【摘要】：采用等离子熔覆方法在Q235钢基体上制备了WC增强Fe基合金熔覆层,研究了添加质量分数为10%~30%WC-Co对熔覆层的微观结构和湿砂磨损特性的影响。结果表明:大部分WC-Co在等离子熔覆过程中发生分解,WC-Co添加量为30%时,熔覆层主要由α-Fe固溶体、Fe6W6C、(Cr,Fe)23C6和WC相组成;熔覆层的显微组织形貌自界面结合处至涂层上部逐渐转变,即由平面晶变为树枝晶再转为胞状晶,α-Fe固溶体主要以树枝晶/胞状晶存在,而Fe6W6C、(Cr,Fe)23C6相则主要在枝晶间析出;熔覆层显微硬度均不小于800HV0.2,其湿砂磨损形式主要为磨粒磨损,且熔覆层显微硬度与抗湿砂磨损能力均随WC-Co添加量增加而增大,这主要与强化相(Fe6W6C、(Cr,Fe)23C6、WC)的含量以及固溶强化效果随WC-Co添加量增多而增大有关。
[Abstract]:WC reinforced Fe based alloy cladding was prepared on Q235 steel substrate by plasma cladding. The effect of addition mass fraction of 10% and 30% WC-Co on the microstructure and wet sand wear properties of the cladding layer was studied. The results show that when the content of WC-Co in plasma cladding is 30%, the cladding layer is mainly composed of 伪 -Fe solid solution (Fe 6W 6C) and Fe 6W 6C + Cr (Fe 6W 6C) and WC phases, and the microstructure of the coating changes from the interface to the upper part of the coating, the microstructure of the coating changes gradually from the interface to the upper part of the coating, and the microstructure of the coating changes gradually from the interface to the upper part of the coating. The 伪 -Fe solid solution mainly exists as dendritic / cellular crystal, while Fe _ 6W _ 6C _ (6) Cr _ (Fe) Fe _ (23) C _ (6) precipitates mainly between dendrites, and the microhardness of cladding layer is not less than 800HV0.2.The wet sand wear is mainly abrasive wear. The microhardness and wear resistance of the cladding layer increase with the increase of WC-Co content, which is mainly related to the content of Fe _ 6W _ 6C _ (6) and the solution strengthening effect increasing with the increase of WC-Co content.
【作者单位】：河海大学力学与材料学院;常州市河海科技研究院有限公司;
【基金】：江苏省自然科学基金(BK2011250) 江苏省博士后科学基金(1101017C) 中国博士后科学基金(20100481079)
【分类号】：TG174.4

【参考文献】