11_2

Materials Science and Engineering: An Introduction

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245 11.4 We are asked for the temperature range over which several iron-carbon alloys should be austenitized during a full-anneal heat treatment. (a) For 0.25 wt% C, heat to between 845 and 870∞C (1555 and 1600∞F) since the A 3 temperature is 830∞C (1525∞F). (b) For 0.45 wt% C, heat to between 790 and 815∞C (1450 and 1500∞F) since the A 3 temperature is 775∞C (1425∞F). (c) For 0.85 wt% C, heat to between 742 and 767∞C (1368 and 1413∞F) since the A 1 temperature is 727∞C (1340∞F). (d) For 1.10 wt% C, heat to between 742 and 767∞C (1368 and 1413∞F) since the A 1 temperature is 727∞C (1340∞F). 11.5 The purpose of a spheroidizing heat treatment is to produce a very soft and ductile steel alloy having a spheroiditic microstructure. It is normally used on medium- and high-carbon steels, which, by virtue of carbon content, are relatively hard and strong. 11.6 Hardness is a measure of a material's resistance to localized surface deformation, whereas hardenability is a measure of the depth to which a ferrous alloy may be hardened by the
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This document was uploaded on 05/04/2010.

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