The fourth generation single crystal superalloy with [001], [011] and [111] orientations was cast using seed method in the directionally solidified furnace. The tensile properties of the alloy with different orientations were investigated at 23 ℃, 800 ℃ and 980 ℃.The alloy microstructure, fracture surface and fracture microstructure with different orientations at different temperatures were investigated by OM and SEM. The results show that the alloy with different orientations has obviously various as-cast dendritic structure and heat treated microstructure on the section perpendicular to the crystal growth direction. The yield strength and ultimate tensile strength of the alloy at different temperatures are decreased with the sequence of [111],[001] and [011] orientation. The elongation and contraction of area of the alloy with [011] orientation are the largest at 23 ℃ and 980 ℃, and those alloys with [111] orientation are the largest at 800 ℃. The tensile fractures of the alloy with different orientations at 23 ℃ and 800 ℃ are quasi-cleavage, while that the alloys with [111] and [001] orientations are dimple fractured, and that the alloy with [011] orientation shows quasi-cleavage and dimple mixture mode. After tensile fracture, the γ′ phase of alloy with different orientations at 23 ℃ and 800 ℃ still remains in cube shape. The γ′ phase of alloy with [001] orientation at 980 ℃ becomes longer along the stress direction, while that the alloy with [111] orientation turns parallelogram and that with [011] orientation is cut through by single slip band.
Tensile anisotropy of the fourth generation single crystal superalloy at different temperatures
2019
Aufsatz (Zeitschrift)
Elektronische Ressource
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