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以海洋工程装备材料E690高强钢为研究对象,进行了不同环境下腐蚀疲劳裂纹扩展试验,利用扫描电镜观察了断口的形貌特征,并根据实验结果计算了该钢腐蚀环境中的裂纹扩展参数,分析了腐蚀因素对疲劳裂纹扩展的影响。结果表明:空气及盐水中的材料裂纹扩展速率随应力强度因子范围的增加而不断增大。在裂纹扩展的初始阶段,盐水环境中裂纹扩展速率是空气中的3倍;而在其裂纹扩展的中后期,盐水环境与空气环境中的裂纹扩展速率相近。
Taking E690 high-strength marine engineering equipment material as the research object, the corrosion fatigue crack propagation experiment under different environments was conducted. The morphological characteristics of the fracture surface were observed by scanning electron microscopy. According to the experimental results, the crack propagation parameters in the corrosion environment of the steel were calculated. The influence of corrosion factors on fatigue crack growth is analyzed. The results show that the crack propagation rate in air and brine increases with the increase of the stress intensity factor. In the initial stage of crack propagation, the crack propagation rate in salt water environment is three times that in air; while in the middle and later stages of crack propagation, the brine environment is similar to the crack growth rate in air environment.