摘要:
为进一步提高中部槽使用寿命，选用铁基自熔性合金粉末，采用激光熔覆手段对新型耐磨板ZM4-13进行表面强化，并利用光学显微镜、扫描电子显微镜、能谱仪、维氏硬度计、湿式橡胶轮试验机、冲击试验机等对其显微组织、显微硬度、耐磨性能以及冲击性能进行分析。结果表明：耐磨层主要由富Cr树枝晶及枝晶间共晶组织组成。强化后激光熔覆耐磨板相较于ZM4-13基板各项性能得到显著提高，其中熔覆层显微硬度相较于基板提高251.9HV5，熔覆层耐磨性为基板的3.02倍，纵向及横向冲击性能分别增加了26.0J和20.4J。本研究为激光熔覆表面强化ZM4-13中板的工业应用提供实验室数据参考。
关键词:
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激光熔覆
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中部槽
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新型耐磨板
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性能
Abstract:
To further enhance the service life of the chute, iron-based self-fluxing alloy powder was chosen, and laser cladding was employed to conduct surface strengthening on the new wear-resistant plate ZM4-13. The microstructure, microhardness, wear resistance, and impact resistance were analyzed using optical microscopes, scanning electron microscopes, energy dispersive spectrometers, Vickers hardness testers, wet rubber wheel testing machines, and impact testing machines. The results indicate that the wear-resistant layer is mainly composed of Cr-rich dendrites and eutectic structures between dendrites. After the strengthening by laser cladding, the performance of the wear-resistant plate has been significantly improved compared to the ZM4-13 substrate. Specifically, the microhardness of the cladding layer is 251.9 HV5 higher than that of the substrate, the wear resistance of the cladding layer is 3.02 times that of the substrate, and the longitudinal and lateral impact resistance has increased by 26.0 J and 20.4 J, respectively. This research provides laboratory data references for the industrial application of laser cladding surface strengthening of the ZM4-13 middle plate.
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