Оцінка структури й властивостей сплаву Inconel 718, виготовленого традиційними й інноваційними методами

• Дата: 2023
• Автори: Касай, Павло, Педаш, Олексій, Клочихін, Володимир
• Формат: Стаття
• Мова: Українська
• Опубліковано: Physico-technological Institute of Metals and Alloys 2023
• Теми: жароміцний сплав; адитивні технології; селективне лазерне сплавлення; PREP-процес; газова атомізація; термообробка; об’ємна деформація
• Онлайн доступ: https://www.metalsandcasting.com/index.php/mcu/article/view/64
• Назва журналу: Metal and Casting of Ukraine

Comparative study of microstructure and mechanical properties of specimens produced from iron-nickel based Inconel 718 superalloy via selective laser melting process and conventional hot rolling has been carried out in present article. Powders from Inconel 718 alloy produced by vacuum induction gas atomization process (VIGA-process) and super speed plasma rotation electrode process (SS PREP-process) were applied for selective laser melting process. Selective laser melting specimens were built in both horizontal (XY) and vertical (Z) directions. It was established, that in specimens in as-built state accurately expressed zones of layer-by-layer smelting with 100 mm height were observed. Standard heat treatment, with hardening and subsequent two-steps aging, provides microstructure homogeneity of the alloy at all, and strengthening of the alloy provides by intermetallic phase g’’ – Ni3Nb, carbides and g’-phase. In microstructure an excessive lamellar d-phase and carbonitrides also were identified. Standard mechanical testing shows, that better complex of mechanical properties was obtained in selective laser melting specimens, which was built in horizontal direction. Rolling material provides much bigger impact strength indexes. One should note that mechanical properties of all considered specimens meet the specification requirements. Bigger indexes of stress rupture strength were obtained in specimens printed in vertical direction with a powders obtained by super speed plasma rotation electrode process. In this case, indexes of stress rupture strength even exceed indexes obtained in rolling material. Thus, the presents results show, that selective laser melting process can give parts with a level of mechanical properties close to rolling material, but in some cases even exceeds them.