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Влияние послесварочной термической обработки на ударную вязкость сварного соединения из стали Р91

Н. М. Пандыа, В. Д. Калыанкар, Х. В. Наик

Аннотация


Исследованы листы из ферритно-мартенситной стали P91, подвергнутые электродуговой сварке и термической обработке по трем различным режимам: отпуск (PWDT), нормализация с отпуском (PWNT) и двойная аустенитизация (закалка + нормализация) с отпуском (PWDNT). Показано, что после обработки по режимам PWDNT и PWNT повышается ударная вязкость и уменьшается разброс микротвердости. После PWDNT формируется более дисперсная структура по сравнению с обработкой PWNT, вследствие чего повышается ударная вязкость до 135 Дж, благодаря однородной структуре отпущенного реечного мартенсита с большим количеством мелких включений M23C6 и MX. Разрушение сварных соединений, обработанных по режимам PWDNT и PWNT, при испытании на удар имеет вязкий характер.

Ключевые слова


steel P91; welded joint; post-welding heat treatment; microstructure; impact toughness

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Литература


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