About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Texture-Dependent Hierarchical Strain Localization in Nickel-Based Alloy and Its Effect on Deformation Behaviours |
Author(s) |
Yixuan Chen, Weihao Wang, Yao Ou, Hai Chang, Zirong Zhai |
On-Site Speaker (Planned) |
Yixuan Chen |
Abstract Scope |
Laser powder bed fusion (L-PBF) offers significant potential for tailoring microstructures in nickel-based superalloys. However, the influence of texture characteristics on the evolution of coherent γ′ precipitates and their multi-scale deformation behavior remains unclear. In this study, IN738LC samples with random and strong ⟨001⟩ textures were fabricated using 200 °C and 700 °C base plate preheating, respectively. After hot isostatic pressing and subsequent solution-aging treatments, the L-PBF-induced heterogeneous microstructural features were retained. The heat-treated coherent γ′ precipitates inherited the matrix orientation, with their morphology and distribution modulated by dislocation substructures. Through integrated in-situ tensile testing, and GND-based multi-scale crystal plasticity finite element (CPFE) modeling, the texture-dependent strain localization mechanisms were quantitatively elucidated. Experimental results demonstrate that the random-textured sample exhibited pronounced strain localization at the grain scale due to hard-soft orientation interactions. At the γ-γ′ scale, random-textured sample showed significant stress redistribution. In contrast, the strong ⟨001⟩-textured sample displayed γ-γ′ co-deformation behavior and reduced dislocation multiplication rates. CPFE simulations further revealed that initial GND distribution and texture-induced strain partitioning jointly govern multi-scale deformation responses. This study establishes the coupled effects of L-PBF-induced textures of γ and γ′, providing theoretical guidance for designing γ/γ′ compatibility and achieving strength-ductility synergy through texture and process control. |
Proceedings Inclusion? |
Planned: |