Figure 9.30 (from Callister 8e) shows a microstructure resulting from slow cooli

Question

Figure 9.30 (from Callister 8e) shows a microstructure resulting from slow cooling of an iron-carbon alloy to room temperature. It consists of the ductile alpha phase (light gray) and the more brittle Fe3C phase (darker gray). Note that the Fe3C phase appears in an alternating layer form called the eutectoid microconstituent. The alpha phase appears both in the eutectoid microconstituent and in a primary (~circular) form. Based on the Fe-C phase diagram (Fig. 9.24, Callister 8e), select the most likely alloy composition for this steel. C0 = 0.022 wt%C C0 = 0.40 wt%C C0 = 0.76 wt%C C0 = 2.14 wt%C C0 = 4.3 wt%C C0 = 6.7 wt%C

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