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本文采用预制有倾斜裂纹的四点弯曲试样研究了30CrMnSi钢的(Ⅰ+Ⅲ)复合型氢致开裂行为。实验结果表明:在连续充氢条件下,K_Ⅲ/K_Ⅰ+0～1.73范围内,不同复合比值的(Ⅰ+Ⅲ)复合型试样的氢致开裂敏感性大致相同。用三轴张力和塑性变形联合致氢富集的观点对上述结果进行了分析,发现塑性变形在氢致开裂过程中同样起着十分重要的作用。
In this paper, the cracking behavior of (Ⅰ + Ⅲ) composite hydrogen induced cracking in 30CrMnSi steel was investigated by four-point bending specimens prefabricated with oblique cracks. The experimental results show that the hydrogen induced dehiscence sensitivity of (Ⅰ + Ⅲ) composite samples with different compound ratios is almost the same under the condition of K_Ⅲ / K_Ⅰ + 0 ~ 1.73 under continuous charge of hydrogen. The above results were analyzed from the viewpoint of hydrogen enrichment combined with triaxial tension and plastic deformation and found that plastic deformation also played an important role in the hydrogen induced cracking process.