Abstract
Obtaining large ingots of refractory metals with a single-crystal structure is still a difficult technical task. Large-sized tungsten ingots up to 15 cm cross-section can be obtained at rates of 17…70 mm/min using the technology of additive plasma-induction layer-by-layer growth. The most single-crystalline repeated structure of the tungsten ingot was obtained at 26 mm/min. Some deterioration in the structure of the ingot is associated with a technological change in the rate of surfacing and technical pauses. Volumetric single-crystallinity in the layers of the tungsten ingot is confirmed by research with such analytical criteria as the misorientation angle of the subgrain structure is less than 2°, the deviations in growth directions specified by the primary single-crystal base (seed) not exceeding 0,053° according to reflection Laue, and the volumetric repeatability of physical and mechanical properties.
Published Version
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