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二 问答题2 4 .沿晶断裂是裂纹沿晶界扩展而造成金属材料的脆断。在失效分析中常见的有以下几种类型的沿晶断裂形式 :(1)晶界沉淀相造成的沿晶断裂。晶界上不连续的沉淀相在外力作用下 ,在其周围首先形成微孔 ,后经长大连接成为晶界裂纹 ,最后造成沿晶断裂 ,此时为沿晶韧窝断
Second question and answer 2 4. Intergranular fracture is the crack along the grain boundary caused by brittle fracture of the metal material. In the failure analysis are the following types of intergranular fracture: (1) grain boundary precipitation caused by intergranular fracture. Discontinuous precipitation on the grain boundary under the action of external force, the first in their formation of micropores, after the connection by the growth of grain boundary cracks, and finally caused by intergranular fracture, at this time along the fissure dimples