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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.