【摘要】 研究了含氢60μg/g的Zr-2.5Nb压力管材料的氢致延迟开裂（DHC）行为,采用"力值波动监测法"来监测试样DHC裂纹扩展情况,计算了不同试验条件下试样的应力强度因子门槛值（KIH）和氢致延迟开裂速率（DHCR）,同时研究了温度和轧制方向对DHC行为的影响规律。结果表明:实验温度为250℃时,Zr-2.5Nb合金DHCR范围为5.15×10^-815.14×10^-8 m/s,KIH值范围为16.55¹8.49 MPam^1/2;实验温度为200℃时,DHCR范围为2.11×10^-82.36×10^-8 m/s,KIH值范围为26.22³0.89 MPam^1/2。随着温度的降低,DHCR减小,KIH值升高。预制裂纹方向垂直于轧制方向时,DHC开裂现象不明显。更多还原

【Abstract】 In this paper, the behavior of delayed hydride cracking in Zr-2.5Nb pressure tube material containing 60 μg/g hydrogen has been investigated. During the experiments, the DHC crack growth was monitored by the force fluctuation. The crack propagation rate（DHCR）and the threshold stress intensity factor（ KIH） were calculated later. Moreover, the influence of temperature and rolling direction was investigated. The results have shown that when the test temperature is 250℃, the rang of DHCR and KIH is 5.15×10^-815.14×10^-8 m/s and 16.55 ¹8.49 MPa m^1/2, respectively. When the test temperature is 200℃, the rang of DHCR and KIH is 2.11×10^-82.36×10^-8 m/s and 26.22³0.89 MPa m^1/2, respectively. As the temperature decreases, the DHCR reduces while the value of KIH increases. When the preset crack direction is vertical to the rolling direction, the DHC phenomenon has not been observed.更多还原