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借助电镜观察了粒状贝氏体小岛回火析出的渗碳体与铁素体之间的取向关系,利用取向关系转换矩阵特征值和特征向量的计算,对 Isaichev 关 系 作 了 分 析 。 结 果 表 明 Isaichev 关 系 确 实 是Kurdjumov-Sachs(K-S)关系与Pitsch关系的复合,从而确认了这一取向关系下渗碳体析自奥氏体而不是铁素体的观点。同时矩阵计算也说明了珠光体转变中奥氏体、铁素体和渗碳体之间所报道的取向关系是不能同时成立的。
The orientation relationship between cementite and ferrite precipitated by the tempering of granular bainite islands was observed by means of electron microscope. The relationship between Isaichev and ferrite was analyzed based on the calculation of the eigenvalues and eigenvectors of orientation relations. The results show that the Isaichev relationship is indeed a composite of the Kurdjumov-Sachs (K-S) relationship with the Pitsch, confirming the view that the cementite is precipitated from austenite rather than ferrite under this orientation. At the same time, the matrix calculation also shows that the orientation relationship reported between austenite, ferrite and cementite in the pearlite transformation can not be established at the same time.