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Meeting Materials Science & Technology 2020
Symposium Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales II
Presentation Title Investigating the Microstructural Origins of Hydrogen Effects on Deformation and Fracture
Author(s) Coleman Alleman, Christopher San Marchi, Brian Kagay
On-Site Speaker (Planned) Coleman Alleman
Abstract Scope The mechanisms of hydrogen-assisted fracture in austenitic stainless steels are only superficially described in the literature. Here, we attempt to produce causal and quantitative evidence of hydrogen-affected deformation and fracture. We analyze oligocrystalline microstructures consisting of small numbers of large grains. This allows us to isolate deformation mechanisms in physical samples and to create computationally equivalent microstructures to simulate the experimentally-observed responses. This talk focuses on the development and application of a framework to simulate stress-strain responses of oligocrystal microstructures. This framework consists of a tool to assign a best-fit crystal orientation on a regular 2D grid, an application to simulate grain growth in a 3D volume with boundary conditions imposed by a 2D domain, and a crystal plasticity model capable of simulating the mechanical response of 3D microstructures. Preliminary simulations have been performed to study the interplay of morphology and hydrogen effects in the mechanical response of oligocrystals.
Proceedings Inclusion? Planned: At-meeting proceedings


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Integrating Materials Models and Dynamical Electron Diffraction Simulations for Dislocation Analysis using STEM-Defect Contrast Imaging
Investigating the Microstructural Origins of Hydrogen Effects on Deformation and Fracture
Novel Remapping Method for HR-EBSD Based on Computer Vision Algorithm
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Texture Evolution of Individual Layers during Accumulative Roll Bonding of Fe-Cu Metallic Laminates
Twinning Nucleation in Hexagonal Close-packed Crystals
Ultra-high strength and plasticity mediated by partial dislocations and defect networks

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