建立了金属中裂纹形核的一个理论模型。通过理论分析，获得金属中裂纹的形核准则，定义了与材料晶粒和脆性沉淀物尺寸有关的材料影响参数，并与其他研究者的结果进行了对比分析结果表明，本文提出的模型有更明确的物理意义，形核准则较好地反映了形核应力与材料组织的对应关系。 A theoretical model of the nucleation of the metal in the crack was established. Through the theoretical analysis, the nucleation rules of the cracks in the metal are obtained, and the influencing parameters of the materials related to the grain size of the material and the size of the brittle precipitate are defined. The results are compared with the results of other researchers. The results show that the proposed model has more Clear physical meaning, nucleation criteria better reflect the correspondence between nuclear stress and material organization.