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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~(-8)~15.14×10~(-8) m/s,KIH值范围为16.55~18.49 MPam~(1/2);实验温度为200℃时,DHCR范围为2.11×10~(-8)~2.36×10~(-8) m/s,KIH值范围为26.22~30.89 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。
Hydrogen induced delayed cracking (DHC) behavior of a Zr-2.5Nb pressure pipe material containing 60μg / g hydrogen was studied. The crack growth at DHC was monitored by the “Force Fluctuation Monitoring Method”, and the crack growth was calculated under different experimental conditions The stress intensity factor (KIH) and hydrogen induced delamination cracking rate (DHCR) of specimens were also investigated. The effects of temperature and rolling direction on the behavior of DHC were also studied. The results show that the DHCR range of Zr-2.5Nb alloy is 5.15 × 10 -8 ~ 15.14 × 10 -8 m / s and the KIH range is 16.55 ~ 18.49 MPam ~ (1) when the experimental temperature is 250 ℃. / 2). The DHCR ranged from 2.11 × 10 -8 to 2.36 × 10 -8 m / s and the KIH ranged from 26.22 to 30.89 MPam -1 at 200 ℃. As the temperature decreases, the DHCR decreases and the KIH increases. DHC cracking phenomenon is not obvious when the pre-crack direction is perpendicular to the rolling direction.