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1037 - S-84 ● Chapter 10 Phase Diagrams FIGURE 10.37 The...

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Unformatted text preview: S-84 ● Chapter 10 / Phase Diagrams FIGURE 10.37 The dependence of eutectoid composition (wt% C) on alloy concentration for several alloying elements in steel. (From Edgar C. Bain, Functions of the Alloying Elements in Steel, American Society for Metals, 1939, p. 127.) 0.8 Eutectoid composition (wt% C) Ni 0.6 Cr 0.4 Si Mo 0.2 Ti W Mn 0 0 2 4 6 8 10 12 14 Concentration of alloying elements (wt%) temperature and to carbon concentration. These effects are illustrated in Figures 10.36 and 10.37, which plot the eutectoid temperature and eutectoid composition (in wt% C) as a function of concentration for several other alloying elements. Thus, other alloy additions alter not only the temperature of the eutectoid reaction but also the relative fractions of pearlite and the proeutectoid phase that form. Steels are normally alloyed for other reasons, however—usually either to improve their corrosion resistance or to render them amenable to heat treatment (see Section 14.6). ...
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