对300M钢在空气和质量分数3.5%NaCl水溶液中分别进行了疲劳裂纹扩展速率试验,得到了其疲劳裂纹扩展速率-应力强度因子范围曲线,并分别利用Paris公式和Walker公式对曲线进行了拟合;分析了应力比、腐蚀环境、频率对疲劳裂纹扩展速率的影响.结果表明:300M钢的疲劳裂纹扩展速率随应力比的增加而增大;在相同应力比下,300M钢在NaCl水溶液中的疲劳裂纹扩展速率在裂纹扩展前期比在空气中的快,在扩展后期则趋于一致;较低试验频率下300M钢在裂纹扩展前期的疲劳裂纹扩展速率比在较高频率下的快.
The fatigue crack growth rate test was conducted on 300M steel in air atmosphere and 3.5wt% NaCl-water solution, and the fatigue crack growth rate-stress intensity factor range curves were obtained and fitted using Paris and Walker formulas, respectively.The effects of stress ratio, corrosion environment and frequency on the fatigue crack growth rate were analyzed.The results show that the fatigue crack growth rate of 300M steel increased with the increasing stress ratio;at the same stress ratio, the crack growth rate of 300M steel in NaCl-water solution was higher than that in air atmosphere during the early stage of crack growth, and tended to be the same in the later propagation stage;in the early stage of crack growth, the crack growth rate of 300M steel under relatively low frequency was higher than that under relatively high frequency.
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