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本文研究了30CrMnSiNi2A 钢在三种不同充氢条件下的裂纹扩展速率 dα/dt,声发射计数率 dn/dt 与应力强度因子 K_1之间的关系。实验结果表明,dα/dt 和 dn/dt 取决于 K_1的大小和试样中的原始含氢量,在双对数坐标中,dα/dt 和 dn/dt 都随 K_1的增加成直线关系增加,且随充氢时间的增加而增加,裂纹扩展的声发射讯号是断续突发性的。用缺陷增强氢的扩散过程的模型进行了理论计算,对实验结果进行了解释。
In this paper, the relationship between crack propagation rate dα / dt and acoustic emission count rate dn / dt of 30CrMnSiNi2A steel under three different hydrogen charging conditions and stress intensity factor K_1 was studied. The experimental results show that dα / dt and dn / dt depend on the size of K_1 and the original hydrogen content in the sample. In double logarithmic coordinates, dα / dt and dn / dt increase linearly with the increase of K_1, And increases with the increase of hydrogen charging time. The acoustic emission signal of crack propagation is intermittent and sudden. The model of hydrogen diffusion process with defects is theoretically calculated and the experimental results are explained.