The effect of the annealing temperature and the cold rolling strain on
the softening during isochronal annealing for 30 min is shown in Fig. 3.
The hardness of cold rolled steel samples decreases with increasing the
annealing temperature, and the rate of annealing softening depends on
both the temperature and the cold rolling strain. Annealing at temperatures
of T ≤ 773 K does not lead to any significant decrease in the hardness
of the cold rolled samples irrespective of the previous cold rolling
strain that suggests that static recovery is the main softening mechanism
in this temperature range. The sample cold rolled to a strain of
0.2 softens slightly upon annealing at 873 K, whereas annealing at
higher temperatures leads the fractional softening to almost 1,
i.e., reaching the lowest Hv. In contrast, the samples subjected to cold
rolling with larger total strains are characterized by a drastic drop in
the hardness after heating to 873 K. Correspondingly, the fractional softening
of the sample strained to 0.2 does not exceed 0.3 after annealing
at 873 K, while the fractional softening of the samples strained to
ε ≥ 0.5 attains about 0.6 after annealing at 873 K and then gradually increases
to about 0.9 with increasing the temperature to 1073 K. From
the obtained results, therefore, it can be concluded that in contrast to
annealing at 773 K, the temperature of 873 K was sufficient to initiate
recrystallization in all differently deformed samples
The effect of the annealing temperature and the cold rolling strain onthe softening during isochronal annealing for 30 min is shown in Fig. 3.The hardness of cold rolled steel samples decreases with increasing theannealing temperature, and the rate of annealing softening depends onboth the temperature and the cold rolling strain. Annealing at temperaturesof T ≤ 773 K does not lead to any significant decrease in the hardnessof the cold rolled samples irrespective of the previous cold rollingstrain that suggests that static recovery is the main softening mechanismin this temperature range. The sample cold rolled to a strain of0.2 softens slightly upon annealing at 873 K, whereas annealing athigher temperatures leads the fractional softening to almost 1,i.e., reaching the lowest Hv. In contrast, the samples subjected to coldrolling with larger total strains are characterized by a drastic drop inthe hardness after heating to 873 K. Correspondingly, the fractional softeningof the sample strained to 0.2 does not exceed 0.3 after annealingat 873 K, while the fractional softening of the samples strained toε ≥ 0.5 attains about 0.6 after annealing at 873 K and then gradually increasesto about 0.9 with increasing the temperature to 1073 K. Fromthe obtained results, therefore, it can be concluded that in contrast toannealing at 773 K, the temperature of 873 K was sufficient to initiate锛ในตัวอย่างพิการแตกต่างกันทั้งหมด
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