用菊池衍射测定相间位向关系新技术对一种白口铸铁中M7C3型碳化物的晶体学进行了研究.结果表明,在这一材料中至少M7C3型碳化物属于正交晶系,而非一般认为的六方晶系.发现了三种M7C3型碳化物与奥氏体间的位向关系.它们是:(15)C∥(111)A,[101]C∥[10]A和(11)C∥(1)A,[01]C∥[0]A以及(21)C∥(11)A,[112]C∥[0]A.应用最近提出的"Edge-to-edge" Matching理论可对这一结果作出合理的解释.
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