| 在两种拉伸纤维中观察到的沉淀在退火后几乎消失 |
| 添加时间：2019/10/25 14:05:08 浏览次数： |
| 再结晶退火过程中的微观结构演变 Microstructure evolution during recrystallization annealing 1.1再结晶晶粒的演变图8显示了直径为20 m的拉伸纤维在983 K下退火不同保温时间的金相图。可以看出，一些新再结晶的核位于初始变形晶界(图8(a))，这表明退火5分钟后已经发生再结晶。当保持时间ex趋于15分钟时，再结晶晶粒的体积分数显著增加(图8(c))，并且再结晶晶粒的尺寸随着保持时间的进一步增加而在一定程度上增加。 1.1 the evolution diagram of recrystallized grain 8 shows the metallographic diagram of tensile fiber with diameter of 20 m annealed at 983k for different holding time. It can be seen that some newly recrystallized nuclei are located at the initial deformed grain boundary (Fig. 8 (a)), which indicates that recrystallization has taken place 5 minutes after annealing. When the holding time ex approaches 15 minutes, the volume fraction of recrystallized grains increases significantly (Fig. 8 (c)), and the size of recrystallized grains increases to a certain extent with the further increase of holding time. 在纤维直径为8 m的情况下，如图9所示，延长退火时间也导致再结晶晶粒的尺寸和体积分数增加。然而，与20 m(图8(a))相比，直径为8 m的纤维在983 K下退火5分钟后的再结晶度明显提高(图9(a))，这意味着直径较小的纤维中更早开始再结晶。此外，在两种拉伸纤维中观察到的沉淀在退火后几乎消失。 When the fiber diameter is 8 m, as shown in Figure 9, the increase of annealing time also results in the increase of recrystallization grain size and volume fraction. However, compared with 20 m (Fig. 8 (a)), the recrystallization degree of 8 m-diameter fibers after annealing at 983 K for 5 minutes is significantly higher (Fig. 9 (a)), which means that recrystallization begins earlier in the smaller diameter fibers. In addition, the precipitates observed in the two kinds of tensile fibers almost disappeared after annealing. 图10和11分别示出了两种纤维在不同温度下平均再结晶晶粒尺寸D和再结晶晶粒体积分数Xv随退火时间t的变化。结果表明，提高退火温度或延长保温时间都可以促进退火温度的提高 Figures 10 and 11 show the average recrystallized grain size D and the recrystallized grain volume fraction XV of the two fibers at different temperatures as a function of annealing time t. The results show that increasing the annealing temperature or prolonging the holding time can improve the annealing temperature. |
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