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采用硬度测量、冲击韧度测试、光学金相及扫描电子显微术,分析了壁厚为90 mm的高铬铸铁件的组织特征及磨损性能。实验结果表明:经过高温等温后淬火,铬的碳化物尺寸明显长大,并随淬火温度的升高而增大。热处理后试样的硬度比铸态明显增加,且随淬火温度的升高,硬度值呈现上升趋势;同时,磨损质量损失相对于铸态试样明显降低,并随淬火温度的升高而减少。对于本实验的高铬铸铁试样,硬度越高,耐磨性能越好。
The microstructure and wear properties of high chromium cast iron with a thickness of 90 mm were analyzed by hardness measurement, impact toughness test, optical metallography and scanning electron microscopy. The experimental results show that: after high temperature isothermal quenching, chromium carbide size significantly increased, and with the quenching temperature increases. After heat treatment, the hardness of the sample increased significantly compared with that of the as-cast sample, and the hardness increased with the increase of the quenching temperature. Meanwhile, the loss of wear mass was significantly lower than that of the as-cast sample and decreased with the increase of the quenching temperature. For this experiment, high chromium cast iron samples, the higher the hardness, the better wear resistance.