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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

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Applications of Computational Polarized Light Microscopy for Large Area Orientation Determination of alpha-Titanium
Bridging Computational Modeling and In Situ Experiment to Decipher Microscopic Deformation Mechanics
Characterization of 3-D Slip Fields in Deforming Polycrystals
Combining Multi-scale Modeling and Three-Dimensional Diffraction to Investigate Chemical and Displacement Ordering in Metallic Alloys
Design of an Austenitic Steel Weldment System Using ICME
Development of a Reactive Forcefield to Model Cu-Ni Alloy Oxidation and Surface Segregation in Thermal Conditions
Diffraction Elastic Constants from Electron Backscatter Diffraction Data and Finite Element Models
Directionally-anisotropic Mobility of Faceted Boundaries Explained through Interfacial Dislocation Mechanisms
ECCI Image Simulations for Arbitrary Defect Displacement Fields
Electron Backscatter Diffraction Pattern Simulation for Interaction Volume Containing Lattice Defects
Experimental Capabilities at High Pressure Collaborative Access Team (HPCAT) for In-situ and In-operando Characterization of Pressure/Stress Induced Microstructural Changes in Materials
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
On the Characterization of Twin-twin Interactions in Mg and Its Alloys
Predicting the Stress Strain Behavior of Nickel Single Crystal Through an Integrated First-principles Calculation and Crystal Plasticity Finite Element Modeling Approach
Regulating Elastic and Plastic Deformations by Microstructure Design and Coupling between Deformation and Phase Transformation - An Integrated Modeling and Experimental Study
Strong strain hardening in ultrafast melt-quenched nanocrystalline Cu: the role of fivefold twins
Synchrotron X-ray Tools for Multiscale Studies of Microstructure Evolution
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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