Fundamentals of Materials Science and Engineering: An Integrated Approach, 3e

GTBL042-08 GTBL042-Callister-v3 October 4, 2007 11:51

2nd Revised Pages

8.13 Recrystallization • 267

400 600 800 1000 1200

100 200 300 400 500 600 700

0.010

0.020

0.030

0.040

600

300

400

500

60

50

40

30

20

Cold-worked

and recovered

grains

New

grains

Recovery Recrystallization Grain growth

Ductility

Tensile strength

Tensile strength (MPa)

Grain size (mm)

Ductility (%EL)

Annealing temperature (°C)

Figure 8.22 The Annealing temperature (°F)

influence of

annealing

temperature (for an

annealing time of

1 h) on the tensile

strength and ductility

of a brass alloy.

Grain size as a

function of annealing

temperature is

indicated. Grain

structures during

recovery,

recrystallization, and

grain growth stages

are shown

schematically.

(Adapted from G.

Sachs and K. R. Van

Horn,Practical

Metallurgy, Applied

Metallurgy and the

Industrial Processing

of Ferrous and

Nonferrous Metals

and Alloys,

American Society for

Metals, 1940, p. 139.)

Critical Percent cold work

deformation

0 10203040506070

300

400

600

800

1000

1200

1400

1600

500

600

700

800

900

Recrystallization temperature (

C)

Recrystallization temperature (

F)

Figure 8.23 The

variation of

recrystallization

temperature with

percent cold work for

iron. For

deformations less

than the critical

(about 5%CW),

recrystallization will

not occur.