10_9

Materials Science and Engineering: An Introduction

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235 10.19 We are called upon to name the microstructural products that form for specimens of an iron- carbon alloy of eutectoid composition that are continuously cooled to room temperature at a variety of rates. Figure 10.19 is used in these determinations. (a) At a rate of 200 ° C/s, only martensite forms. (b) At a rate of 100 ° C/s, both martensite and pearlite form. (c) At a rate of 20 ° C/s, only fine pearlite forms.
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Unformatted text preview: 10.20 Below is shown a continuous cooling transformation diagram for a 1.13 wt% C iron-carbon alloy, with continuous cooling paths that will produce (a) fine pearlite and proeutectoid cementite; (b) martensite; (c) martensite and proeutectoid cementite; (d) coarse pearlite and proeutectoid cementite; and (e) martensite, fine pearlite, and proeutectoid cementite....
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