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研究了３．５％ＮａＣｌ溶液（ＳＷ）、蒸馏水（ＤＷ）和空气（ＡＩＲ）３种环境和Ｒ＝０．１、０．５两种应力比对３００Ｍ钢疲劳裂纹萌生寿命（ＦＣＩＬ）的影响。结果表明，腐蚀环境显著降低疲劳强度和ＦＣＩＬ。在同一等效应力幅（Δσｅｑｖ）水平下，３种环境中的ＦＣＩＬ（Ｎｉ）的大小依次为（Ｎｉ）ＡＩＲ＞（Ｎｉ）ＤＷ＞（Ｎｉ）ＳＷ。在同一等效应力幅Δσｅｑｖ水平下，３００Ｍ钢在ＳＷ小的腐蚀疲劳（ＣＦ）裂纹萌生寿命（ＣＩＬ）随应力比的提高而提高。义小给出了Ｎｉ与Δσｅｑｖ，ＣＦ强度损失因子Ｄｓ与Ｎｉ，ＣＦＣＩＬ损失因子ＤＬ与Δσｅｑｖ等的关系人达式。
The effects of 3.5% NaCl solution (SW), distilled water (DW) and air (AIR) on the fatigue crack initiation life (FCIL) . The results show that the corrosive environment significantly reduces fatigue strength and FCIL. Under the same equivalent stress amplitude (Δσeqv), the size of FCIL (Ni) in the three environments is (Ni) AIR> (Ni) DW> (Ni) SW. Under the same equivalent stress amplitude of Δσeqv, the fatigue life (CIL) of 300M steel increases with the increase of stress ratio in SW. The definition of Ni and Δσeqv, CF strength loss factor Ds and Ni, CFCIL loss factor DL and Δσeqv and so on the relationship between the HRV.