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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.
X-ray diffraction method was used to study seven kinds of chrome steel, further confirming the results of the austenite isothermal decomposition process and the Cr / C ratio in chrome steel.The new point of view is explained, and the above process is also found Austenite decomposition temperature (or degree of supercooling) (Figure 3) Austenite with a low Cr / C ratio forms initially (Fe, Cr) _3C throughout the temperature range shown in Figure 3. And It can be roughly predicted that (Cr, Fe) _ (23) C_6 will be formed in the early stage of austenite with a high Cr / C ratio and (Cr, Fe) _7C_3 will be formed in the intermediate temperature range, The (Fe, Cr) _3C.Cr / C ratio of austenite formed (Cr, Fe) _7C_3 in the initial stage and the formation of (Fe, Cr) _3C in the low temperature range. Case, there is a transition from one phase to the other consisting of two phases.