Multiscale Modeling of Microstructure Deformation in Material Processing: Multiscale Modeling of Microstructure Deformation in Material Processing
Program Organizers: Lukasz Madej, AGH University of Science and Technology; Jaimie Tiley, AFRL/RXLMD; Krzysztof Muszka, AGH University of Science and Technology; Danuta Szeliga, AGH University of Science and Technology
Tuesday 2:00 PM
November 3, 2020
Room: Virtual Meeting Room 14
Location: MS&T Virtual
Session Chair: Lukasz Madej, AGH University; Krzysztof Muszka, AGH University
2:00 PM
Modeling Mechanical Response of Microtextured Regions in Hexagonal Metals: Joseph Tucker1; Sushant Jha2; Sean Donegan3; James Larsen3; Adam Pilchak3; 1Exponent; 2University of Dayton Research Institute; 3Air Force Research Laboratory
Crystallographic texture affects most physical properties in anisotropic materials. A particular spatial arrangement in hexagonal metals known to adversely affect fatigue properties are clusters of similarly oriented grains known as microtextured regions (MTRs), which may behave as larger individual features depending on the details of their internal crystallography. This work briefly introduces leveraging electron backscatter diffraction (EBSD) to segment and characterize MTRs with automated tools, while the focus is on Fast Fourier Transform (FTT) simulations evolving mechanical response at the mesoscale to interrogate MTR behavior. A case study using representative titanium EBSD data containing MTRs is presented, including the FFT boundary conditions, elastic and plastic properties, and imposed stress state. The reliability of the EBSD segmentation is assessed and the segmentations are compared to the FFT result thus establishing confidence in the segmentation and simulation. The results of the segmentation are used in a microtexture and dwell-time-dependent crack growth model.
2:40 PM
Multiscale Approach to Model Deformation Behavior of Multilayered Sheets Produced by Explosive Cladding: Krzysztof Muszka1; Marcin Kwiecien1; Paulina Lisiecka-Graca1; Janusz Majta1; Konrad Perzynski1; Lukasz Madej1; 1AGH University of Science and Technology
In the present study, the three-layered material (copper/steel/copper) was built using explosive cladding technique. Its rheology was studied using different plastometric tests. Additionally, in order to assess its forming limit curves at room temperature, Erichsen cupping tests were performed. The Digital Image Correlation system was used to evaluate deformation behavior of each layer and the whole multilayered system. Based on experimental work, multiscale computer model was created using FEM combined with DMR approach. Computer simulations of Erichsen cupping tests were performed and results were compared with the experiments. Proper numerical representation of multilayered morphology as well as mechanical response of each layer allowed for ability of the model to predict forming limit curves.
3:00 PM
The Research Thermoplastic Deformation Modes of Dual-phase Special Alloys for Obtaining Rational Intermetallic Structure: Borys Sereda1; Dmytro Sereda1; Yuriy Belokon2; 1Dneprovsky State Technical University; 2ZNU
The purpose of this work is to investigate the structure formation in intermetallic γ-TiAl alloys by using a complex plastic deformation technology under non-stationary temperature conditions with niobium doping. Mathematical model aimed at obtaining γ-TiAl alloys with a given structure and properties is proposed and implemented, based on the use of data on the features of the physical modeling of the SHS-pressing process. For a mathematical description of the process of extrusion of a high-temperature synthesis product, it is necessary to determine a system of equations that takes into account the distribution of the thermo-kinetic and rheological properties of the synthesis product in a mold and caliber. High-temperature synthesis of intermetallic compound γ-TiAl in a powder mixture of pure elements in the conditions of SHS-pressing allows to obtain an intermetallic alloy with an average grain size of ~ 30 microns.