1116 - 11.7 Mechanical Behavior of Iron–Carbon Alloys 800...

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Unformatted text preview: 11.7 Mechanical Behavior of Iron–Carbon Alloys 800 A Eutectoid temperature 700 (c) P A P+A 1000 500 Temperature (°C) Temperature (°F) ● 339 1400 1200 600 A A+B B 800 (c) 400 (a) 300 (b) M(start) 200 M(50%) M(90%) 100 (c) (b) 100% 50% Pearlite Martensite 50% Bainite 0 10 1 1 10 102 Time (s) 103 (a) 100% Bainite 104 600 400 200 105 FIGURE 11.16 Isothermal transformation diagram for an iron–carbon alloy of eutectoid composition and the isothermal heat treatments (a), (b), and (c) in Example Problem 11.1. 11.6 CONTINUOUS COOLING TRANSFORMATION DIAGRAMS (CD-ROM) 11.7 MECHANICAL BEHAVIOR OF IRON –CARBON ALLOYS We shall now discuss the mechanical behavior of iron–carbon alloys having the microstructures discussed heretofore, namely, fine and coarse pearlite, spheroidite, bainite, and martensite. For all but martensite, two phases are present (i.e., ferrite and cementite); and so an opportunity is provided to explore several mechanical property–microstructure relationships that exist for these alloys. ...
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