采用X射线衍射法对七种铬钢进行了研究.进一步证实了关于铬钢中奥氏体等温分解过程和Cr/C比值有关的结果.采用新的观点进行解释. 同时还发现上述过程也和奥氏体的分解温度(或过冷度)有关(图3).Cr/C比值低的奥氏体在图3中所示之全部温度范围内,初期都形成(Fe,Cr)_3C.并且能够大致地预测Cr/C比值高的奥氏体初期在高温范围内将形成(Cr,Fe)_(23)C_6,在中温范围内将形成(Cr,Fe)_7C_3,在低温范围内将形成(Fe,Cr)_3C.Cr/C比值适中的奥氏体初期在高温和中温范围内都形成(Cr,Fe)_7C_3,在低温范围内形成(Fe,Cr)_3C. 并且初步认为在所有的情况下,都存在从一相至另一相的由两相构成的过渡区.
Carbides formed initially during isothermal decomposition of austenite in sevenchromium steels have been studied by X-ray diffraction method. The relationshipsexisting between Cr/C ratio and types of initial carbides formed have been con-firmed and re-explained by a new concept. It was also found that the carbidesforming process is dependent on the decomposition temperature of austenite. Withdifferent Cr/C ratios and decomposition temperatures, the types of the initialcarbides formed are different. Transition regions possibly exist between any twoadjacent single phase regions in all diagrams.
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