Abstract: The curves of stress relaxation at 25℃, 80℃, 160℃ and 240℃ have been measured, according to testing data we have analogized the equation of the curves. Because of this curves varing, the structure transites of material have been observed by means of TEM and SEM. So that we supposed that process of stress relaxation is that the dislocations translate into regularity and stress changes in to homogeneous.

Key words: 弹簧, 松弛曲线, 位错, 应力松弛