实验表明,球铁中上、下贝氏体的分界温度约在300℃,下贝氏体转变激活能与高碳钢接近,而上贝氏体的转变激活能很小;球铁上贝氏体铁素体与母相奥氏体的位向关系为N—W关系,而下贝氏体铁素体与奥氏体的位向符合K—S关系,下贝氏体铁素体和渗碳体的为向符合Bagaryatski关系.并对上、下贝氏体转变的激活能进行了分析.
The temperature which separates upper and lower bainitic transformations is about 300℃ in nodular cast iron. The overall activation energy of lower bainitic transformation of it is nearly the same as that for high carbon steels, but that of upper bainitic transformation is much smallar than the value of latter. this can be explained by the fact that the addition of Si suppresses precipitation of Fe_3C. The following orientation relationships have been observed by the present work: N-W relation for ferrite and austenite in upper bainite; K-S relation for ferrite and austenite in lower bainite and Bagaryatski relation for Fe_3C and ferrite in lower bainite.
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