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本文研究了GC-4高强度钢的腐蚀疲劳裂纹扩展行为。考虑了不同热处理制度、不同环境(实验室空气、3.5%NaCl溶液、蒸馏水)和不同应力比(R=0.1,0.3)的影响。研究表明,300℃等温的疲劳及腐蚀疲劳裂纹扩展性能远优于180℃等温制度,在盐水和蒸馏水环境下裂纹扩展速率明显加快,随着应力比的提高,环境影响加剧。利用扫描电镜对试样断口形貌进行了分析并讨论了腐蚀疲劳机理。
In this paper, the corrosion fatigue crack growth behavior of GC-4 high strength steel was studied. The influences of different heat treatment regimes, different environments (laboratory air, 3.5% NaCl solution, distilled water) and different stress ratios (R = 0.1, 0.3) were considered. The results show that the isothermal fatigue and corrosion fatigue crack propagation at 300 ℃ are much better than the 180 ℃ isothermal system, and the crack propagation rate in salt water and distilled water is obviously accelerated. As the stress ratio increases, the environmental impact aggravates. The morphology of the fracture surface was analyzed by scanning electron microscopy and the mechanism of corrosion fatigue was discussed.