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

GTBL042-11 GTBL042-Callister-v3 October 4, 2007 11:59

2nd Revised Pages

436 • Chapter 11 / Phase Transformations

Tempering temperature (°C)

Tempering temperature (°F)

Tensile and yield strength

200

400 600 800 1000 1200

300 400 500

Reduction

in area

Yield strength

Reduction in area (%)

Tensile strength

600

30

40

50

60

100

800 120

1000

1200

1400

1600

1800

140

160

180

200

220

240

260

MPa 10

3 psi

280

Figure 11.35

Tensile and yield

strengths and

ductility (%RA) (at

room temperature)

versus tempering

temperature for an

oil-quenched alloy

steel (type 4340).

(Adapted from figure

furnished courtesy

Republic Steel

Corporation.)

Time (s)

(^205) °C (400°F)
(^315) °C (600°F)
(^425) °C (800
°F)
(^535) °C (1000
°F)
Rockwell hardness, HRC
Brinell hardness number
101 102 103 104 105
300
400
500
600
700
1 min 1 h 1 day
30
35
40
45
50
55
60
65
70
Figure 11.36
Hardness (at room
temperature) versus
tempering time for a
water-quenched
eutectoid plain
carbon (1080) steel.
(Adapted from
Edgar C. Bain,
Functions of the
Alloying Elements in
Steel, American
Society for Metals,
1939, p. 233.)