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Influence of carbon pre-coating prior to laser deposition on rolling contact fatigue of gray cast iron

机译：激光沉积前碳预涂对灰口铸铁滚动接触疲劳的影响

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摘要

This work presented a study on the improvement of laser surface treatment on rolling contact fatigue resistance of gray cast iron. Sample surface covered with carbon powder was coupled with localized treatment by high-energy laser beam-a process denned as "laser cladding (LC)." With this method, the optimum precoating thickness was experimentally studied. Compared to the region treated by laser remelting, the crystal in LC region was finer, more compact, and uniform. Mechanical property testing showed not only high micro-hardness of LC region, but also improved tensile and compressive resistance of treated material. Fatigue wear tests and thorough analysis of fatigue detects suggested that LC treatment significantly improved fatigue wear resistance (FWR). Improved FWR was likely facilitated by delayed initiation and propagation of cracks, as well as the reduction of contact stress on substrate. Additionally, formations of fatigue defects on sample surface were thoroughly discussed.
机译：这项工作提出了改进激光表面处理对灰铸铁滚动接触疲劳强度的研究。样品表面被碳粉覆盖，并通过高能激光束进行局部处理，该过程被称为“激光熔覆（LC）”。用这种方法，实验研究了最佳的预涂层厚度。与通过激光重熔处理的区域相比，LC区域的晶体更细，更致密，更均匀。力学性能测试不仅显示了LC区的高显微硬度，而且还改善了处理材料的拉伸和压缩强度。疲劳磨损测试和对疲劳检测的透彻分析表明，LC处理可显着提高抗疲劳磨损性（FWR）。裂纹的延迟萌生和扩展以及减少基材上的接触应力可能有助于改善FWR。此外，彻底讨论了样品表面疲劳缺陷的形成。

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  • 来源
    《Journal of Materials Research》 |2015年第20期|3104-3115|共12页
  • 作者

    Zhikai Chen; Ti Zhou; Ruoyu Zhao; Haifeng Zhang; Wanshi Yang; Hong Zhou; Peng Zhang; Luquan Ren;

  • 作者单位

    The Key Lab of Automobile Materials, The Ministry of Education, Jilin University, Changchun, Jilin Province 130025, People's Republic of China;

    The Department of Mechanical and Automotive Engineering, Jilin University, Changchun, Jilin Province 130025, People's Republic of China;

    The Key Lab of Automobile Materials, The Ministry of Education, Jilin University, Changchun, Jilin Province 130025, People's Republic of China;

    The Department of Mechanical and Automotive Engineering, Changchun University, Changchun, Jilin Province 130028, People's Republic of China;

    The Key Lab of Automobile Materials, The Ministry of Education, Jilin University, Changchun, Jilin Province 130025, People's Republic of China;

    The Key Lab of Automobile Materials, The Ministry of Education, Jilin University, Changchun, Jilin Province 130025, People's Republic of China;

    The Key Lab of Automobile Materials, The Ministry of Education, Jilin University, Changchun, Jilin Province 130025, People's Republic of China;

    The Key Lab of Terrain Machinery Bionics Engineering, The Ministry of Education, Jilin University, Changchun, Jilin Province 130025, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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