本工作研究了应力比和载荷频率对高强度低碳硅锰钢在蒸馏水及3.5％NaCl溶液中腐蚀疲劳断口形貌的影响。试验结果表明,在介质影响疲劳裂纹扩展行为的范围内的断口上,随着应力比的增加或者载荷频率的减小,应力腐蚀开裂的断口形貌所占比例逐渐增加。根据多视域的观测结果,建立起了腐蚀疲劳断裂机制示意图。
The change of corrosion fatigue(CF) fractography with stress ratio (R) and frequency (f) were studied in distilled water and 3.5％ NaCl aqueous solution. It is shown that the variations of CF fractography with increase in R or decrease in f are similar, i. e., the tendency of stress corrosion cracking (SCC)fractography increased with increase in R or decrease in f on CF fractography. A mechanism schetch map of crack propagation which indicated the influence of R and f on CF cracking mechanism was presented.
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