Phase diagram of the Co–Al–W system. structure and phase transformations near the Co3(Al, W) intermetallic composition range

Microstructure and compression strength of Co-based superalloys hardened by γ′ and carbide precipitation

“…In the same way, those borides block the grain growth making the microstructure more stable during the heating. Also, the B enhanced the oxidation behaviour of Co-based superalloys, likewise, to add Cr or Si has the same effect as B but with better oxidation results [26][27][28]. It is the formation of a fine oxide line on the surface that protect the alloy against the extreme conditions.…”

“…In the way to increase the ´ area stability, which means the increment of ´ volume fraction, the Al and W amount were modified [14][15][16]. It is important to take into account that when the amount of W is high, the density and the weight of alloy increases proportionally as well as the brittleness due to the precipitation of intermetallics such as Co3W or Co7W6 [23][24][25][26].…”

“…In order to minimise the Ni effect, it is necessary to add alloying elements that stabilise and increase the  area and the solvus temperature. Also, the alloying elements solve the negative effect of Ni on the interdiffusion coefficient [25,26]. Those elements achieve to increase the ´ stability and therefore the volume fraction of ´ getting higher solvus temperature with an offset of 200 °C [17][18][19][20].…”

Влияние Тугоплавких Элементов На Структуру Жаропрочных Кобальтовых Сплавов

“…ВЛИЯНИЕ ТУГОПЛАВКИХ ЭЛЕМЕНТОВ НА СТРУКТУРУ ЖАРОПРОЧНЫХ КОБАЛЬТОВЫХ СПЛАВЛОВ 1 Давыдов Д.И., 1 Казанцева Н.В., 1 Ежов И.В., 2 Попов Н.А. 1 Институт физики металлов имени М.Н.…”

“…1 Институт физики металлов имени М.Н. Михеева УрО РАН, Екатеринбург 2 Уральский федеральный университет им. Б.Н.…”