通过在18,35和55℃蒸馏水中疲劳裂纹扩展试验,证明了超高强度钢30CrMnSiNi2A腐蚀疲劳具有强烈的温度效应,得到了ΔK值和温度对裂纹扩展速率影响的复合表达式。由于扩展速率数据拟合得到的表观激活能值(36.7kJ/mol)十分接近于氢在γ-Fe中的扩散激活能值,支持了氢助裂纹扩展的观点。对大气中疲劳裂纹扩展具有重要价值的过载迟滞效应,在腐蚀疲劳时显著地减小,在0.1Hz的低频率下尤其明显。
By the test of fatigue crack growth in distilled water at temperaturesvaried from 18 to 55℃, the confirmation of the intensive temperature effect on thecorrosion fatigue for super strength steel 30CrMnSiNi2A and the compound expres-sion concerning the effects of ΔK and temperature on crack growth rate (CGR)have been made. Because the apparent activation energy (36.7 kJ/mol) resulted byregressive analysis of CGR data is nearly equal to the activation energy of hydro-gen diffusion in γ-Fe, it is strong enough to support the theory of hydrogen assis-ted crack growth. The overload retardation effect, which is significant to the fa-tigue crack propagation in atmosphere, greatly decreases in corrosion fatigue crackgrowth, especially at lower frequency, e. g., 0.1Hz. This phenomenon may be ex-plained as the increase of the SCC component of CGR after an overload.
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