【摘要】 20、45、T7、T10钢试样,在镀铬后进行渗碳.金相观察和x—射线衍射分析表明,渗层由内渗层和外渗层两部分组成.由表及里相组成分别为Cr₂O₃、Cr₃C₂、Cr₇C₃、Cr、Cr₇C₃、Cr₃C₂.当镀铬层较薄时,Cr相消失.由于渗层硬度很高,试样的耐磨性得到明显提高.本文对渗层形成机理亦进行了探讨和分析.更多还原

【Abstract】 The specimens of four chromium- plated carbon steels were carburized at different temperatures (960-1100℃ )- The microstructures were examined by optical microscopy and the phase components of the diffusion layer were analyzed by x-ray diffraction. It was shown that the diffusion yer consists of two parts-outer layer and inner layer, the phase components from surface to core are successively Cr2O3, Cr3C2, CrrC3, Cr, Cr7C3, Cr3C2with the Cr phase being the demarkation of the outer and inner layers. If the chromium layer is thin, the chromium phase in the diffusion layer disappears. The hardness of the layer is rather high and the specimens possess high wear resistance. A discussion on the mechanism of the diffusion layer formation is presented.更多还原