在张应力为55—180MPa和150(?)400℃温度循环条件下,研究了应力和温度循环次数对氢含量为220μg/g的Zr-4板中氢化物再取向程度影响。随着应力增大和温度循环次数增加,氢化物再取向程度增大,但是氢化物发生再取向存在一个应力阈值,当张应力低于应力阈值时,即使增加温度循环次数,氢化物再取向也不明显。应力阈值又会随温度循环次数增加而降低。 Under the conditions of tensile stress of 55-180 MPa and temperature of 150 (?) 400 ℃, the influence of the number of cycles of stress and temperature on the reorientation degree of hydride in Zr-4 plate with hydrogen content of 220μg / g was studied. As the stress increases and the number of temperature cycles increases, the extent of hydride reorientation increases, but there is a stress threshold for the reorientation of hydride. When the tensile stress is lower than the stress threshold, the hydride reorientation does not increase even if the temperature cycles are increased obvious. The stress threshold will decrease with the increase of temperature cycles.