Unformatted text preview: The final microstructure is tempered martensite. 11.2 Three sources of residual stresses in metal components are plastic deformation processes, nonuniform cooling of a piece that was cooled from an elevated temperature, and a phase transformation in which parent and product phases have different densities. Two adverse consequences of these stresses are distortion (or warpage) and fracture. 11.3 This question asks that we cite the temperature range over which it is desirable to austenitize several iron-carbon alloys during a normalizing heat treatment. (a) For 0.20 wt% C, heat to between 890 and 920∞C (1635 and 1690∞F) since the A 3 temperature is 835∞C (1535∞F). (b) For 0.76 wt% C, heat to between 782 and 812∞C (1440 and 1494∞F) since the A 3 temperature is 727∞C (1340∞F). (c) For 0.95 wt% C, heat to between 840 and 870∞C (1545 and 1600∞F) since A cm is 785∞C (1445∞F)....
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- Austenite, final microstructure