The individual crystal units comprising the aggregate structure where the crystalline orientation does not change. The grain boundary is where these individual crystal units meet.

构成总的结构的单个的晶体个体，而晶体的方位并没有发生变化。晶界是这些单个的晶体单位相遇的界限。

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Experiments show that pearlitic nucleus can form on the austenitic grain boundary, and there is the orientation relationship between ferrite and cementite also.

实验表明，珠光体分解在奥氏体晶界形核，铁素体和渗碳体具有位向关系。

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Experiments show that pearlitic nucleus can form on the austenitic grain boundary, and there is the orientation relationship between ferrite and cementite also.

实验表明，珠光体分解在奥氏体晶界形核，铁素体和渗碳体具有位向关系。

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