Влияние прерывистой закалки на микроструктуру, механические свойства и плотность дислокаций стали AISI 4340

Бурак Налджаджы, Омер Джыхад Айдын, Салых Йилмаз, Волкан Кылыджлы

Аннотация


Исследовано влияние прерывистой закалки на микроструктуру, механические свойства и плотность дислокаций стали AISI 4340. Проведены металлографический и рентгеноструктурный анализы, испытания на растяжение, определена твердость стали по Викерсу. Рассчитана плотность дислокаций. Рассмотрено влияние длительности выдержки при 300 °C в процессе прерывистой закалки на структуру и свойства стали. Установлено формирование дуплексной микроструктуры, состоящей в основном из мартенсита и бейнита, после прерывистой закалки по всем исследованным режимам. Показано положительное влияние дуплексной структуры на механические свойства стали AISI 4340. Установлено, что наиболее высокие значения плотности дислокаций, предела прочности и твердости получены в стали, содержащей 34,7 % бейнита, 55 % мартенсита и 10,3 % остаточного аустенита, после прерывистой закалки с выдержкой при 300 °C, 5 мин.

Ключевые слова


сталь AISI 4340; прерывистая закалка; бейнит + мартенсит; дуплексная микроструктура; плотность дислокаций; механические свойства

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Литература


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DOI: https://doi.org/10.30906/mitom.2022.9.29-38

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