Microstructure and wear resistance of additive layer for middle trough by plasma transferred arc process
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摘要: 采用等离子弧增材修复技术在K360耐磨钢表面制备了铁基合金耐磨层，利用金相显微镜、扫描电子显微镜和X射线衍射仪对耐磨层的物相和组织进行了观察和分析，使用显微维氏硬度计和磨粒磨损试验机测试了耐磨层和基体的硬度和耐磨性。研究结果表明，耐磨层的表面与基体的界面无裂纹、气孔等缺陷产生，耐磨层与基体之间结合良好；耐磨层的平均硬度为535.5 HV 0.3 ，基体的平均硬度为284.2 HVO.3 ，耐磨层的硬度显著高于基体的硬度，相同条件下耐磨层和基体的相对耐磨性为1.56 ，耐磨层的耐磨粒磨损性能较基体显著提高；耐磨层主要由马氏体和碳化物组成，$\mathrm{M}_7\mathrm{C}_3(\mathrm{M}=\mathrm{Fe},\mathrm{Cr}),\mathrm{M}_{23}\mathrm{C}_6,\mathrm{Mo}_2\mathrm{C}$和$\mathrm{Fe}_2\mathrm{MoC}$等碳化物主要存在于晶界，是耐磨层具有较高硬度和良好耐磨性的主要原因之一。Abstract: Fe-based alloy wear-resistant layer was fabricated on the surface of K360 steel by plasma transferred arc additive manufacturing technology. Optical microscopy, scanning electron microscopy and X-ray diffraction were used to observe and analyze microstructure and phase of wear-resistant layer. Microhardness tester and grain-abrasion testing machine were adopted to test microhardness and wear resistance of wearresistant layer and substrate, respectively. The results showed that there were no cracks and pores on the surface of wear-resistant layer and in the interface between wear-resistant layer and substrate, and well metallurgical bonding was achieved between wear-resistant layer and substrate. The average hardness of wear-resistant layer was 535.5 HV0.3 and the average hardness of substrate was 284.2 HV0.3.The hardness of wear-resistant layer was significantly improved than that of substrate. The relative wear resistance of wear-resistant layer and substrate was 1.56 under the same condition. The abrasive wear resistance of wear-resistant layer was significantly improved than that of the substrate. The wear-resistant layer was mainly composed of martensite and carbides, and carbides, such as $\mathrm{M}_7 \mathrm{C}_3(\mathrm{M}=\mathrm{Fe}, \mathrm{Cr}), \mathrm{M}_{23} \mathrm{C}_6, \mathrm{Mo}_2 \mathrm{C}$ and $\mathrm{Fe}_2 \mathrm{MoC}$, mainly existed in grain boundaries, which was one of main reasons why the wear-resistant layer has high hardness and well wear resistance.
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Keywords:
- middle trough /
- additive manufacturing /
- microstructure /
- microhardness /
- wear resistamce
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