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›› 2013, Vol. 13 ›› Issue (3): 536-540.

• 材料工程专栏 • 上一篇    

激光功率对Fe基合金重熔热喷焊层组织和耐磨性的影响

洪永昌 单军战   

  1. 安徽工业大学材料科学与工程学院 安徽工业大学材料科学与工程学院
  • 收稿日期:2013-03-18 修回日期:2013-05-08 出版日期:2013-06-20 发布日期:2013-06-20
  • 通讯作者: 洪永昌

Effect of Laser Power on Microstructure and Wear Resistance of Fe-based Remelted Hot Sprayed-welding Layer

HONG Yong-chang SHAN Jun-zhan   

  1. School of Material Science & Engineering，Anhui University of Technology School of Material Science & Engineering，Anhui University of Technology
  • Received:2013-03-18 Revised:2013-05-08 Online:2013-06-20 Published:2013-06-20
  • Contact: HONG Yong-chang

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摘要： 利用金相显微镜和X射线衍射仪等分析手段，研究了Fe基合金热喷焊层在其他工艺参数相同的条件下，经不同激光功率重熔处理后组织结构的变化，并对其硬度和耐磨性进行了测定比较. 结果表明，Fe基合金热喷焊层的组织较粗大，经不同激光功率重熔处理后有不同程度的细化，激光功率越小，重熔热喷焊层组织越细小. Fe基合金重熔热喷焊层组织主要由g-(Fe,Ni)固溶体基体相和Cr7C3, Cr23C6及Cr2B等强化相组成，硬度和耐磨性较原始热喷焊层均有较大幅度提高，激光功率越大硬度和耐磨性越好，硬度提高约16%，耐磨性提高约55%.

关键词: Fe基合金, 热喷焊层, 激光重熔, 组织, 耐磨性

Abstract: Microstructure change of Fe-based hot spray-welding layers remelted by different laser power under same process conditions was studied by optical microscope and XRD. The results show that the microstructure of Fe-based hot sprayed-welding layer is coarse. After laser remelting at different laser powers, the microstructure of hot sprayed-welding layers is refined to some extent. By comparison, the quicker the laser power, the finer the microstructure of remelted sprayed-welding layers. The microstructure of Fe-based remelted hot sprayed-welding layer is composed of matrix phase of g-(Fe,Ni) solid solution and precipitate phases of Cr7C3, Cr23C6 and Cr2B, etc. Hardness and wear resistance of hot sprayed-welding layers are improved greatly after laser remelting at different laser powers, and the higher the laser power, the more prefect the remelted sprayed-welding layers become. The hardness and wear resistance are increased almost by 16% and 55% respectively compared with unremelted hot sprayed-welding layer.

Key words: Fe-based alloy, hot sprayed-welding layer, laser remelting, microstructure, wear resistance

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