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Proceedings Papers
AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 814-820, February 25–28, 2025,
... be obtained experimentally when using the target alloy. apparent diffusion constant Dapp values dendritic segregations homogenization nickel single crystal superalloys solution heat treatment Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth...
Abstract
View Papertitled, Homogenization During Solution Heat Treatment of Ni-Base Single-Crystal Superalloy TMS-238
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for content titled, Homogenization During Solution Heat Treatment of Ni-Base Single-Crystal Superalloy TMS-238
To maximize the mechanical properties of Ni-base superalloys, solution heat treatment is essential to sufficiently homogenize the dendritic segregations formed during solidification. To investigate the homogenization behavior during solution heat treatment, a Ni-base single crystal superalloy, TMS-238, was heat treated under various conditions; temperatures ranging from 1573 to 1613 K for times ranging from 2 to 100 h. After solution heat treatment, the average concentrations of Re, an element that exhibits the highest degree of segregation, in dendrite core and inter-dendritic regions were analyzed. From these results, apparent diffusion constants, D app , were determined based on a proposed homogenization model. Obtained D app values were significantly smaller than the diffusion constant of Re in Ni, strongly suggesting that the apparent diffusion coefficients should be obtained experimentally when using the target alloy.
