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本文通过钢在腐蚀疲劳(CF)条件下断裂表面的观察,较系统地探讨了钢的CF断裂形态特征。其结果表明,CF的断裂形态强烈地依赖于载荷、介质及其与钢本身之间的相互作用。按照环境对钢的作用强弱,可以出现疲劳辉纹、因均匀腐蚀变宽了的疲劳条纹、晶间腐蚀型疲劳条纹、应力腐蚀开裂(SCC)形态及氢脆(HE)开裂形态特征等。因此,CF断裂形态不具有独特的共同特征,说明CF断裂的机理是多样的。目前,用一种断裂模型(如叠加模型或竞争模型)去解释所有CF断裂现象无疑是困难的。
In this paper, the fracture surface characteristics of steel under corrosion fatigue (CF) are systematically discussed. The results show that the fracture morphology of CF strongly depends on the load, the medium and its interaction with the steel itself. Fatigue fringes, fatigue streaks with uniform corrosion broadening, intergranular corrosion fatigue streaks, SCC morphologies, and hydrogen embrittlement (HE) cracking morphologies may occur depending on the effect of the environment on the steel. Therefore, the fracture morphology of CF does not have the unique common features, indicating that the mechanism of CF fracture is diverse. At present, it is undoubtedly difficult to explain all the phenomena of CF fracture by using a fracture model (such as superposition model or competition model).