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。
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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