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

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2nd Revised Pages

11.7 Mechanical Behavior of Iron–Carbon Alloys • 431

Composition (wt% C)

Percent Fe

C 3

psi 310

MPa

Brinell hardness number

Yield and tensile strength

0

0.2

0.4

0.6

0.8

1.0

350 300 250 200 150 100

40

1200 1100 1000 900 800 700 600 500 400 300

160 140 120 100 80 60

3691215

0

(a)

Pearlite + ferrite

Tensile strength

Brinell hardness

Yield strength

Pearlite

+

Fe

C 3

Composition (wt% C)

Percent Fe

C 3

)f Izod impact energy (ft-lb

Ductility (%)

0

0.2

0.4

0.6

0.8

1.0

80 60 40 20 0

120 100 80 60 40 20 0

3691215

0

(b)

Pearlite + ferrite

Izod impact

energy

Reductionin area

Elongation

Pearlite+ Fe

C 3

Figure 11.30

(a

) Yield strength, tensile strength, and Brinell hardness versus carbon concentration for plain carbon steels

having microstructures consisting of fine pearlite. (

b) Ductility (%EL and %RA) and Izod impact energy versus carbon

concentration for plain carbon steels having microstructures consisting of fine pearlite. [Data taken from

Metals Handbook:

Heat Treating

, Vol. 4, 9th edition, V. Masseria (Managing Editor), American Society for Metals, 1981, p. 9.]