Методы предотвращения трещин IV типа в сварных соединениях жаропрочных высокохромистых сталей мартенситного класса

Михаил Федорович Деменин

doi:10.34831/EP.2021.1081.8.002

Методы предотвращения трещин IV типа в сварных соединениях жаропрочных высокохромистых сталей мартенситного класса

Михаил Федорович Деменин

Аннотация

Рассмотрены основные причины образования трещин IV типа в сварных соединениях жаропрочных высокохромистых сталей мартенситного класса Р91 и Р92. Трещины IV типа возникают в мелкозернистой и межкритической областях зоны термического влияния вследствие образования пор ползучести и формирования локальной мягкой прослойки, в которой не происходит мартенситное превращение. При этом межкритическая область зоны термического влияния имеет самую высокую числовую плотность пор ползучести. Подробно изложены основные методы повышения сопротивления и предотвращения ползучести сварных соединений жаропрочных высокохромистых сталей мартенситного класса: модификация состава исходной стали, корректировка технологии сварки и нормализация и отпуск сварного шва.

Ключевые слова

сварка, сталь класса Р91 и P92, растрескивание типа IV, тепловой цикл сварки, микроструктура, сопротивление ползучести, мартенситное превращение, погонная энергия, зона термического влияния, поры ползучести, нормализация, термообработка.

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Литература

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DOI: http://dx.doi.org/10.34831/EP.2021.1081.8.002