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Микроструктура и особенности разрушения алюминиевого сплава AA7075-T651, охлажденного в процессе сварки трением с перемешиванием

Т. Сриниваза Рао, С. Р. Котесвара Рао, Г. Мадхусудхан Редди

Аннотация


Исследованы сварные соединения из пластин толщиной 16 мм из алюминиевого сплава АА7075, полученные методом сварки трением с перемешиванием. Определены макроструктура области сварки вдоль толщины пластин и микроструктура разных участков сварного соединения на световом и просвечивающем электронном микроскопах. Проведены испытания на растяжение сварных образцов и рассчитаны средние значения пределов прочности и текучести, а также относительного удлинения. Измерены профили твердости по Виккерсу середины поперечного сечения сварного шва. Опробована сварка трением с принудительным охлаждением (потоком сжатого воздуха или погружением в воду) для снижения тепловых повреждений и повышения механических свойств. Показана эффективность такой сварки.

Ключевые слова


алюминиевый сплав AA7075; сварка трением с перемешиванием; принудительное охлаждение; разрушение; просвечивающая электронная микроскопия; aluminum alloy AA7075; friction stir welding; forced cooling; fracture; transmission electron microscopy

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Литература


Микроструктура и особенности разрушения алюминиевого сплава AA7075-T651, охлажденного в процессе сварки трением с перемешиванием

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DOI: https://doi.org/10.30906/mitom.2019.6.48-55

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