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    CeO2加入含量對激光熔覆WC增強鎳基合金涂層組織與性能的影響
              
    Effect of CeO2 Adding Content on Microstructure and Properties of Laser Cladding WC Reinforced Nickel-Based Alloy Coating

    摘    要
    以鎳包碳化鎢粉和CeO2粉的混合粉為原料,采用激光熔覆技術在42CrMo鋼表面制備WC增強鎳基合金涂層,研究原料中CeO2質量分數(0~2.0%)對涂層物相組成、顯微組織、硬度和耐磨性能的影響。結果表明:添加CeO2后涂層的物相由γ-(Ni,Fe)固溶體、Ni3Fe、WC、Cr23C6、M7C3(M=Fe、Cr)以及少量的CeNi3組成;涂層與基體間形成了良好的冶金結合;當CeO2的質量分數為1.0%時,組織致密均勻,細化效果最明顯;隨著CeO2含量的增加,涂層的硬度呈先升高再下降的趨勢,摩擦因數和磨損量呈先降低后增加的趨勢;添加質量分數1.0% CeO2涂層的平均硬度最高,為956.0 HV,比未添加CeO2的提高了29%,平均摩擦因數和平均磨損體積最小,分別為0.383,11.25×10-3 mm3,與未添加CeO2的分別降低了27%和20%,涂層的耐磨性能最好,磨損機制為輕微的磨粒磨損。
    標    簽 激光熔覆   CeO2   WC增強鎳基合金涂層   組織   硬度   耐磨性能   laser cladding   CeO2   WC reinforced nickel-based alloy coating   microstructure   hardness   wear resistance  
     
    Abstract
    The mixed powders with nickel-coated tungsten carbide powder and CeO2 powder was used as raw materials, WC reinforced nickel-based alloy coating was prepared on the surface of 42CrMo steel by laser cladding technique. The effect of mass fraction (0-2.0%) of CeO2 in raw materials on the phase composition, microstructure, hardness and wear resistance of the coating was investigated. The results show that the phase of the coating with CeO2 was composed of γ-(Ni, Fe) solid solution, Ni3Fe, WC, Cr23C6, M7C3 (M=Fe, Cr) and a small amount of CeNi3. A good metallurgical bond was formed between the coating and the substrate. When the mass fraction of CeO2 was 1.0%, the structure was dense and uniform, and the refinement effect was the most obvious. With increasing CeO2 content, the hardness of the coating increased first and then decreased, and the friction coefficient and the amount of wear decreased first and then increased. The average hardness of the coating with 1.0% CeO2 was the highest, which was 956.0 HV, and increased by 29% compared with that without CeO2; the average friction coefficient and the average wear volume were the smallest, which were 0.383 and 11.25×10-3 mm3, and were reduced by 27% and 20% compared with those without CeO2, respectively. The wear resistance of the coating with 1.0% CeO2 was the best, and the wear mechanism of the coating was slight abrasive wear.

    中圖分類號 TG174.4   DOI 10.11973/jxgccl202107006

     
      中國光學期刊網論文下載說明


    所屬欄目 試驗研究

    基金項目

    收稿日期 2020/8/1

    修改稿日期 2021/4/1

    網絡出版日期

    作者單位點擊查看

    備注徐歡歡(1995-),女,山東菏澤人,碩士研究生

    引用該論文: XU Huanhuan,LIN Chen,LIU Jia,ZHANG Liang,SHEN Jingyi. Effect of CeO2 Adding Content on Microstructure and Properties of Laser Cladding WC Reinforced Nickel-Based Alloy Coating[J]. Materials for mechancial engineering, 2021, 45(7): 27~34
    徐歡歡,林晨,劉佳,張梁,申井義. CeO2加入含量對激光熔覆WC增強鎳基合金涂層組織與性能的影響[J]. 機械工程材料, 2021, 45(7): 27~34


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