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Анализ кинетики изотермического бейнитного превращения в легированных сталях
Аннотация
Проведено дилатометрическое исследование образования бейнита при изотермической выдержке в промышленных и экспериментальных легированных сталях разного состава. Рассмотрено влияние условий охлаждения до температуры изотермической закалки на последующий процесс бейнитного превращения. Описана экспериментальная кинетика образования бейнита при помощи уравнения Остина-Риккета (ОР). Установлена температурная зависимость параметров n и ln (k) уравнения ОР, а также их линейная взаимосвязь. Показано, что стали определенных классов имеют различия в зависимости n = f[ln (k)], связанные, вероятно, с разной устойчивостью переохлажденного аустенита. Установлено, что в ряде случаев кинетика изотермического бейнитного превращения может быть наиболее адекватно описана уравнением Колмогорова-Джонсона-Мела-Аврами (КДМА). Предложена методика применения дифференциального уравнения, обобщающего уравнения ОР и КДМА, которая позволяет получить наиболее точное описание кинетики образования бейнита.
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Литература
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DOI: https://doi.org/10.30906/mitom.2023.8.15-25
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