珠光体组织的疲劳裂纹扩展方式可分为A,B,C三种类型。A型为裂纹同时横切多层铁素体片和渗碳体片而扩展;B型为裂纹逐层切割铁素体片和渗碳体片扩展;C型为裂纹只沿一层铁素体片或其界面扩展。A型出现的几率最大,B型的扩展阻力最大,C型的扩展阻力和出现的几率都最小。在疲劳裂纹扩展过程中它们的断口特征和比例都不同。在疲劳裂纹慢速扩展区,珠光体组织的疲劳裂纹扩展方式为A型加部分C型或B型。在疲劳裂纹稳态扩展区以A型和B型为主,可见明显的疲劳条纹,在快速扩展区以解理或韧窝为主。
Observations were demonstrated of 3 different types of the fatigue crack propagation of pearlitic structure: type A——the crack intersects the multiple ferrites and cementites simultaneously; type B——the crack cuts the ferrite and cementite one after another and type C——the crack propagates only through ferrite plate or along interface of ferrite and cementite. The fractographic examination indicated that the 3 fracture types in the process of fatigue crack propagation appear as different feature and proportion. In the slow stage of the fatigue crack propagation, it is the type A with partly type C or B; in the stable stage, mainly type A and B as well as marked fatigue striation; while in fast speed stage, the cleavage or dimple with partly striation predominantly.
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