| 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%WCCo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WCCo在等离子熔覆过程中发生分解，WCCo添加量为30%时，熔覆层主要由αFe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，αFe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800 HV0.2，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WCCo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WCCo添加量增多而增大有关。 |
| 关键词: Fe基合金 涂层 等离子熔覆 WC 磨损 |
| DOI：10.11933/j.issn.1007-9289.2015.01.006 |
| 分类号: |
| 基金项目: |
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| Microstructure and Wet Sand Abrasion Resistance of Fe-based Alloy Clad Coatings Reinforced with WC |
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JIANG Shaoqun, WANG Gang, CHEN Chaowen1,2
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1. College of Mechanics and Materials, Hohai University, Nanjing 210098;2. Changzhou City Hohai Science and Technology Research Institute Company Limited, Changzhou 213164, Jiangsu
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| Abstract: |
| The Febased alloy clad coatings reinforced with WC were prepared on Q235 steel by a plasma cladding process. The effects of WCCo doping content (10%30%) on the microstructure and wet sand abrasion resistance of the clad coatings were investigated. Results show that most WCCo particles are dissolved during the cladding process and the clad coating with 30% WCCo mainly consists of αFe solid solution, Fe6W6C,(Cr, Fe)23C6 and WC phases. The microstructure of the clad coatings gradually transits from planar crystal to dendritic crystal and cellular crystal along the direction from the interface of the substratecoating to the top of the coating. The αFe solid solution presents in the form of dendritic crystal/cellular crystal. The Fe6W6C and (Cr, Fe)23C6 phases mostly precipitate in the intergranular network of the dendrites. The microhardness of the clad coatings is not less than 800 HV0.2. All of the clad coatings display abrasive wear feature. Moreover, the microhardness and wet sand abrasion resistance of the clad coatings are improved with the increase of WCCo doping content, which can be mainly attributed to the combined action of the enhancement of solution strengthening effect and the increase of reinforcements (Fe6W6C, (Cr, Fe)23C6, and WC). |
| Key words: Febased alloy coating plasma cladding WC abrasion |
