Page 265 - Materials Science and Engineering An Introduction

7.12 Recrystallization • 237

Figure 7.21
Photomicrographs
showing several stages of
the recrystallization and
grain growth of brass.
(a) Cold-worked
(33%CW) grain struc-
ture. (b) Initial stage of
recrystallization after
heating for 3 s at 580 C
(1075 F); the very small
grains are those that
have recrystallized.
(c) Partial replacement
of cold-worked grains by
recrystallized ones (4 s
at 580 C). (d) Complete
recrystallization (8 s at (a) (b)
580 C). (e) Grain growth 100 m 100 m
after 15 min at 580 C.
(f) Grain growth after
10 min at 700 C (1290 F).
All photomicrographs
70 .
(Photomicrographs courtesy
of J. E. Burke, General
Electric Company.)

(c) (d)
100 m 100 m

(e) (f)
100 m 100 m