Zr-4管中氢化物分布的应力再取向研究

A Study of the Stress Reorientation of Hydride in Zircaloy-4 Tube

渗200ppm 氢的 Zr-4管,在周向应力为70—180MPa 和150(?)400℃的条件下,研究了应力和温度循环次数对氢化物再取向的影响。随着应力增大或温度循环次数增加,一部份氢化物由周向分布转变成径向分布。氢化物发生再取向时,先从管壁外表面开始,逐步向内推进。在本实验条件下,当氢化物发生再取向后,并没有全部转变成径向分布,f_(45)只达到0.5,说明控制织构对控制氢化物再取向仍然有效。

Under the conditions of circumferential stress from 70 to 180MPa and temperature cycling between 150℃ to 400℃,the effectsof stress and the number of temperature cycling on the reorien-ration of hydride in Zircaloy-4 tubes containing about 200 ppmhydrogen have been investigated.With the increase of stress orthe number of temperature cycling,some of hydrides change fromtangential to radial distribution and the value of f_(45) increases.Under the experimental conditions,all hydrides do not changefrom tangential to radial distribution and the value of f_(45) is lessthan 0.5 after hydride reorientation.It indicates that controllingtexture is still effective on controlling hydride reorientation.