DOE OSTI · 2538008
Location-Specific Microstructures and Properties of Haynes 282 Alloy with Laser-Wire DED Processing
Abstract
In this work, the location-specific microstructures in terms of grain morphology, texture, γ′ precipitates, carbides, and residual strains were investigated in a series of laser-wire direct energy deposition (LW-DED) Haynes 282 alloys with varied processing parameters. A bimodal grain distribution was found in these as-printed and heat-treated alloys with columnar grains within the layers and fine equiaxed grains at the interlayer regions. Dominant <001> texture along the build direction with more obvious <111> orientation preference exists at the bottom layers, compared to the top layers. The gradient γ′-precipitates size distribution contributes predominantly to the observed gradient hardness distribution in the as-printed samples. The heat-treated 282 exhibit comparable yield strengths to those conventionally-processed counterparts, while the observed small deviation in their yield strengths is attributed to the Hall-Petch effect. This work establishes the correlation between location-specific microstructures and mechanical properties, providing valuable insights into future printing parameters and heat-treatment optimization.
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Feng, Rui [NETL Site Support Contractor, National Energy Technology Laboratory], Tippey, Kristin [NETL Site Support Contractor, National Energy Technology Laboratory], Poplawsky, Jonathan [Oak Ridge National Laboratory (ORNL)], Yu, Dunji [Oak Ridge National Laboratory (ORNL)], An, Ke [Oak Ridge National Laboratory (ORNL)], Sudbrack, Chantal [NETL] (ORCID:0000000281756138). 2025-03-27. Location-Specific Microstructures and Properties of Haynes 282 Alloy with Laser-Wire DED Processing. https://doi.org/10.2172/2538008
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