PSI - Issue 24

Giuseppe Napoli et al. / Procedia Structural Integrity 24 (2019) 110–117 Author name / Structural Integrity Procedia 00 (2019) 000–000

114

5

25

20

15

10

30%

Mean radius [μm]

60%

5

90%

0

Time [s]

Figure 2. Mean radius over time for three different reduction rates.

1

0,9

0,8

0,7

30%

0,6

60%

0,5

0,4

90%

0,3

0,2

Recrystallized volume fraction

0,1

0

Time [s]

F igure 3. Recrystallized volume fraction over time for three values of cold reduction rate. The amount of strain affects also the recrystallization rate because the strain modifies the amount of stored energy and the number of effective nuclei. The model shows that, for the two higher values of 60% and 90% of cold reduction rate, the recrystallized volume fraction reaches the unitary value respectively 5 times and 12 times earlier with respect to the 30% case. 2.4 Annealing temperature effect Another of the free input parameter of the model is the annealing temperature that has a profound effect both on recrystallization kinetics and grain growth. It is well known that it deeply influences the mobility parameter m . Four