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

GTBL042-14 GTBL042-Callister-v2 August 29, 2007 8:59

582 • Chapter 14 / Synthesis, Fabrication, and Processing of Materials

8620

(0.2 wt% C)

8630

(0.3 wt% C)

8640

(0.4 wt% C)

8660

(0.6 wt% C)

Hardness, HRC

20

40

50

60

170 70 31 18 9 5.6 3.9 2.8 2

490 305

270

125 56 33 16.3 10

Cooling rate at 700°C (1300°F)

7 5.1 3.5

°C/s

°F/s

30

Distance from quenched end

0 10 20 30 40 50 mm

0 14 12 34 1 14 12 111 34 2 in.

Figure 14.9

Hardenability curves for

four 8600 series alloys of

indicated carbon content.

(Adapted from figure

furnished courtesy

Republic Steel

Corporation.)

Hardness, HRC

20

40

50

60

170 70 31 18 9 5.6 3.9 2.8 2

305 125 56 33 16.3 10

Cooling rate at 700°C (1300°F)

7 5.1 3.5

°C/s

°F/s

30

Distance from quenched end

10 20 30 40 50 mm

490

270

0

0

1

4

1

2

3

4 1

1

4

1

2

111 3

4 2 in.

Figure 14.10 The

hardenability band for an

8640 steel indicating

maximum and minimum

limits. (Adapted from figure

furnished courtesy

Republic Steel

Corporation.)