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分别对3种不同Si含量的铁硅二元合金进行了固体渗碳和热处理,借助于OM、SEM、XRD等手段对经固体渗碳后的铁硅二元合金的渗碳层的显微组织进行了观察分析和确定,并测定了其表面硬度以及抗浆体冲蚀磨损性能。结果表明:经930℃×8h固体渗碳+水淬后,铁硅二元合金渗碳层表面硬度最高达66HRC,渗碳层显微组织为M+γ+Fe3C+SiO2;经180℃×3 h低温回火后,表面硬度均能保持在62 HRC左右,渗碳层显微组织为回火M+残余γ+Fe3C+SiO2。其中Fe-1.5Si渗碳8 h水淬+低温回火后的抗浆体冲蚀磨损性能最好。
Three kinds of iron-silicon binary alloys with different Si contents were carburized and heat-treated respectively. The microstructure of the carburized layer of the iron-silicon binary alloy solid-carburized by means of OM, SEM and XRD was studied. The observation and analysis were carried out. The surface hardness and erosion resistance of the slurry were measured. The results show that the hardness of carburized layer of iron-silicon binary alloy reaches 66HRC and the microstructure of carburized layer is M + γ + Fe3C + SiO2 after carburizing and water quenching at 930 ℃ for 8h. After 180 ℃ × 3 h After tempering at low temperature, the surface hardness can be maintained at about 62 HRC, carburized microstructure of the tempering M + residual γ + Fe3C + SiO2. Among them, the erosion resistance of the slurry after Fe-1.5Si carburizing 8 h water quenching + low temperature tempering was the best.