Abstract
Microstructure-dependent deformation and fracture behavior was investigated for an additively manufactured compositionally graded alloy (CGA) printed using the laser-directed energy deposition (L-DED) method to explore an alternative approach for dissimilar metal joints in nuclear energy systems. The electron backscatter diffraction (EBSD) maps from scanning electron microscopy (SEM) display a clear microstructural transition with decreasing austenite-forming elements (Ni and Mn), from an austenite (γ) dominant structure, to a complex composite structure containing ferrite (α), martensite (α′) and retained austenite, and then to a fully ferritic structure. EBSD data were recorded in situ during tensile testing in SEM, and the evolution of the deformation mechanism and microstructure was characterized using Kikuchi diffraction pattern analysis. Complementary analysis for high-resolution features was also performed using scanning transmission electron microscopy (STEM). The Ni/Mn-rich austenite-dominant microstructures showed a complex deformation mechanism of two-step martensitic transformation (γ→ε→α′), whereas the minor austenite phase retained in the ferrite and/or martensite matrix showed a single transformation route (γ→α′). Ordinary dislocation glide and twinning via partial dislocation glide were observed in the austenite deformation. Meanwhile, the ferrite and martensite grains deformed mainly by ordinary dislocation slips and grain rotation. Static tensile fracture was also highly dependent on local composition and phase constituents.
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Acknowledgements
This research was supported by the US Department of Energy, Laboratory Directed Research and Development program and Fusion Materials program at Oak Ridge National Laboratory (ORNL), under contract DE-AC05-00OR22725 with UT-Battelle, LLC. Test materials (compositionally graded alloys) were produced at the Manufacturing Demonstration Facility (MDF) at ORNL: we would like to give special thanks to Mr. Brian Jordan for his effort in production of the graded material blocks. Special thanks also go to the internal reviewers Tim Graening and David Collins for their comments and suggestions that help greatly improving this manuscript.
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Byun, T.S., Gussev, M.N., Bibhanshu, N. et al. Deformation Mechanism Transition in Additively Manufactured Compositionally Graded Fe-Base Alloys. JOM 74, 4042–4058 (2022). https://doi.org/10.1007/s11837-022-05401-1
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DOI: https://doi.org/10.1007/s11837-022-05401-1