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Materials Science and Engineering: An Introduction

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239 (d) For martensite to pearlite, first austenitize at a temperature of about 760 ° C, then cool to room temperature at a rate less than about 35 ° C/s. (e) For pearlite to tempered martensite, first austenitize at a temperature of about 760 ° C, then rapidly quench to room temperature at a rate greater than about 140 ° C/s, then isothermally heat treat (temper) at a temperature between 250 and 650 ° C. (f) For tempered martensite to pearlite, first austenitize at a temperature of about 760 ° C, then cool to room temperature at a rate less than about 35 ° C/s. (g) For bainite to tempered martensite, first austenitize at a temperature of about 760 ° C, then rapidly quench to room temperature at a rate greater than about 140 ° C/s, then isothermally heat treat (temper) at a temperature between 250 and 650 ° C. (h) For tempered martensite to spheroidite simply heat at about 700 ° C for approximately 20 h. 10.33
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This document was uploaded on 05/04/2010.

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