ВЛИЯНИЕ НЕЙТРОННОГО ОБЛУЧЕНИЯ НА МЕХАНИЧЕСКИЕ СВОЙСТВА СТАЛИ 316LN В ЛИТОМ И ХОЛОДНОКАТАНОМ СОСТОЯНИЯХ

Исследованы механические свойства сталей AISI 316LN и модификаций 211L–213L в литом и холоднокатаном состояниях, а также после нейтронного облучения до 2·10¹⁹ н/см² методами Shear Punch и Small Punch. Показано, что модифицированные стали превосходят 316LN по прочности, наилучшее сочетание свойств имеет сталь 211L. Снижение прочности литых сталей в 2–3 раза связано с крупным зерном и литейными дефектами. Облучение нейтронами вызывает значительное упрочнение литых сталей за счёт радиационных дефектов, тогда как в холоднокатаных структурах наблюдается релаксация напряжений. Микроструктурный анализ выявил различия в механизмах деформации и разрушения между литым и холоднокатаным состояниями.

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