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    张宇, 唐彪, 马藤, 毕力格, 周恒. 焊接电流对Ni60/Cr3C2等离子堆焊层组织及性能的影响[J]. 机械工程材料. DOI: 10.11973/jxgccl240249
    引用本文: 张宇, 唐彪, 马藤, 毕力格, 周恒. 焊接电流对Ni60/Cr3C2等离子堆焊层组织及性能的影响[J]. 机械工程材料. DOI: 10.11973/jxgccl240249
    ZHANG Yu, TANG Biao, MA Teng, BI Lige, ZHOU Heng. Effect of Welding Current on Microstructure and Properties of Ni60/Cr3C2 Plasma Surfacing Layer[J]. Materials and Mechanical Engineering. DOI: 10.11973/jxgccl240249
    Citation: ZHANG Yu, TANG Biao, MA Teng, BI Lige, ZHOU Heng. Effect of Welding Current on Microstructure and Properties of Ni60/Cr3C2 Plasma Surfacing Layer[J]. Materials and Mechanical Engineering. DOI: 10.11973/jxgccl240249

    焊接电流对Ni60/Cr3C2等离子堆焊层组织及性能的影响

    Effect of Welding Current on Microstructure and Properties of Ni60/Cr3C2 Plasma Surfacing Layer

    • 摘要: 以Ni60+质量分数20% Cr3C2复合粉末作为堆焊粉末,采用等离子堆焊技术在Q235低碳钢表面制备单道Ni60/Cr3C2堆焊层,研究了焊接电流(110~140 A)对堆焊层宏观形貌、显微组织、硬度及耐磨性的影响。结果表明: Ni60/Cr3C2堆焊层与基体间形成良好的冶金结合。随着焊接电流增大至130 A,堆焊层表面变得光滑平整,成形质量变好,但当焊接电流过高(140 A)时,表面出现氧化烧损现象,成形质量变差。随着焊接电流的增加,堆焊层的熔高、熔深、熔宽、稀释率均增大。110 A焊接电流下的堆焊层由γ-Ni(Fe)、Cr7C3和CrB相组成,随着焊接电流的增加,铬化合物种类增多,130,140 A焊接电流下由γ-Ni(Fe)、Cr7C3、CrB、Cr23C6和Cr3C2相组成;随着焊接电流的增加,堆焊层中的块状组织细化,碳化物增多,但140 A焊接电流下组织又变得粗大且碳化物数量减少,堆焊层的硬度先升后降,磨损质量损失先减后增。当焊接电流为130 A时,堆焊层无明显缺陷,成形质量良好,堆焊层组织最细小,碳化物数量最多且出现了以碳化铬为中心的花状形貌组织,硬度最高,洛氏硬度和维氏硬度分别达到62.6 HRC和763 HV,耐磨性最好,磨损质量损失最小,与基体相比降低65.8%,磨粒磨损程度最轻。

       

      Abstract: Taking Ni60+20wt% Cr3C2 composite powders as surfacing powder, a single-pass Ni60/Cr3C2 surfacing layer was prepared on the surface of Q235 low carbon steel by plasma surfacing technology. The effects of welding current (110‒140 A) on the macromorphology, microstructure, hardness and wear resistance of the surfacing layer were studied. The results show that the Ni60/Cr3C2 surfacing layer exhibited a good metallurgical bond with the substrate. With the increase of welding current to 130 A, the surface of the surfacing layer became smooth and flat, and the forming quality became good, but when the welding current was too high (140 A), the surface oxidation and burning appeared, and the forming quality deteriorated. With the increase of welding current, the melting height, melting depth, melting width and dilution rate of the surfacing layer all increased. The surfacing layer under 110 A welding current was composed of γ-Ni(Fe), Cr7C3 and CrB phases. With the increase of welding current, the types of chromium compounds increased. The surfacing layers under 130,140 A welding current were composed of γ-Ni(Fe), Cr7C3, CrB, Cr23C6 and Cr3C2 phases. With the increase of welding current, the massive structure in the surfacing layer was refined and the number of carbides increased, but the structure became coarse and the number of carbides decreased under the welding current of 140 A; the hardness of the surfacing layer first increased and then decreased, and the wear mass loss first decreased and then increased. When the welding current was 130 A, the surfacing layer had no obvious defects with good forming quality, the finest structure, the largest number of carbides, the flower-like structure centered on chromium carbide, the highest hardness with Rockwell hardness and Vickers hardness of 62.6 HRC and 763 HV, respectively, the best wear resistance and the least wear mass loss with 65.8% lower than that of the substrate, and the lightest abrasive wear degree.

       

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