The development of martensitic microstructure and microcracking in an Fe-1.86C alloy |
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Authors: | M. G. Mendiratta G. Krauss |
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Affiliation: | (1) National Research Council Resident Postdoctoral Research Associate, Lewis Research Center, NASA, Cleveland, Ohio;(2) Department of Metallurgy and Materials Science, Lehigh University, Bethlehem, Pa. |
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Abstract: | The development of the martensitic microstructure in a 1.86 wt pct C steel has been followed by quantitative metallographic measurements over the transformation range of 0.12 to 0.50 fraction transformed (f). The transformation kinetics are described by the equationf = 1 − exp [−0.008 (M s − Tq)] where Ms and Tq are the martensite start and the quenching temperatures respectively. Fullman’s analysis shows that the average volume per martensite plate decreases by almost an order of magnitude over the transformation range studied, but this decrease is less than that predicted by the Fisher analysis for partitioning of austenite by successive generations of martensite. Microcracking increases with increasingf up to 0.3, but does not increase forf above 0.3 where transformation proceeds by the nucleation of large numbers of small martensite plates. These observations indicate that a critical size of martensite plate is necessary to cause microcracking. Formerly Postdoctoral Fellow at Lehigh University |
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