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本文对Ⅰ/Ⅱ复合型加载条件下30CrMnSiA钢预充氢试样的氢致开裂门槛值进行了系统的研究。实验结果表明:随着复合比K_Ⅱ/K_Ⅰ的增加,试样的氢致开裂门槛值逐渐增大;Ⅱ型的最大,约为纯Ⅰ型的2.85倍。和理论分析结果相比较,实测的门槛值明显偏高。对复合型裂端氢浓度分布的分析发现:由于位错对氢的捕获和掠夺,使σ_h~(max)处的平衡氢浓度比理论值有所降低,这正是造成实测门槛值偏大的直接原因。
In this paper, the hydrogen cracking threshold of pre-hydrogenated 30CrMnSiA steel specimens under complex loading conditions Ⅰ / Ⅱ was systematically studied. The experimental results show that with the increase of K_Ⅱ / K_I, the threshold of hydrogen induced cracking increases gradually; the maximum of type Ⅱ is about 2.85 times that of pure type Ⅰ. Compared with the theoretical analysis, the measured threshold is obviously higher. The analysis of the distribution of hydrogen concentration in the composite crack tip shows that the hydrogen concentration at σ_h ~ max is lower than the theoretical value due to the capture and plunder of hydrogen by dislocations, which is exactly the reason why the measured threshold value is too large direct cause.