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高铬铸铁作为耐磨件,在国内外已得到广泛的应用。而共晶碳化物对高铬铸铁的耐磨性有较大的影响。为此,利用透射电镜系统地研究共晶碳化物及生长缺陷有很大的实际意义。一、高铬铸铁样品的成分及热处理工艺:化学成分:所研究的高铬铸铁的化学成分基本上接近共晶成分,其Cr/C>5。热处理工艺:高铬铸铁预先均匀化退火后,加热至1000℃淬火。二、高铬铸铁共晶碳化物的晶体结构及晶体缺陷的透射电子显微分析:金属薄膜的透射电子显微分析证实:该成分的高铬铸铁的共晶碳化物为(Fe·Cr)_7C_3,其电子衍衬像
High chromium cast iron as a wear-resistant parts, has been widely used at home and abroad. The eutectic carbide on the wear resistance of high-chromium castings have a greater impact. Therefore, the use of transmission electron microscopy system of eutectic carbide and growth defects have great practical significance. First, the composition of high chromium cast iron samples and heat treatment process: Chemical composition: The chemical composition of the high-chromium cast iron is basically close to the eutectic composition, the Cr / C> 5. Heat treatment process: high-chromium cast iron pre-homogenized annealing, heated to 1000 ℃ quenching. High-chromium cast iron eutectic carbide crystal structure and crystal defects of transmission electron microscopy: Transmission electron microscopy of metal films confirmed that: the composition of high-chromium cast iron eutectic carbide (Fe · Cr) _7C_3 , Its electron diffraction-like