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本文应用断裂力学及电化学等方法,研究了通过不同回火温度处理具有不同强度水平的34CrNi3Mo和40CrNiMo钢在人造海水中的腐蚀疲劳(CF)和应力腐蚀开裂(SCC)行为。试验结果表明,钢的强度对CF和SCC行为有着强烈的作用。随着钢屈服强度σ_s的提高,钢在海水中的SCC敏感性增大,腐蚀疲劳裂纹扩展速率dα/dN剧增。低合金钢在海水环境中的CF行为与SCC行为密切相关,而在CF条件下可促进钢的SCC敏感性。
In this paper, the corrosion fatigue (CF) and stress corrosion cracking (SCC) behaviors of 34CrNi3Mo and 40CrNiMo steels with different strength levels in artificial seawater were studied by means of fracture mechanics and electrochemistry. The experimental results show that the strength of steel has a strong effect on the behavior of CF and SCC. With the increase of steel yield strength σ_s, the SCC sensitivity of steel in seawater increases, and the rate of corrosion fatigue crack growth dα / dN increases sharply. The CF behavior of low alloy steel in seawater environment is closely related to SCC behavior, while the SCC sensitivity of steel is promoted under CF conditions.