6th World Congress on Integrated Computational Materials Engineering (ICME 2022): Microstructure Evolution and Analysis II
Program Organizers: William Joost; Kester Clarke, Los Alamos National Laboratory; Danielle Cote, Worcester Polytechnic Institute; Javier Llorca, IMDEA Materials Institute & Technical University of Madrid; Heather Murdoch, U.S. Army Research Laboratory; Satyam Sahay, John Deere; Michael Sangid, Purdue University
Tuesday 10:30 AM
April 26, 2022
Room: Regency Ballroom DE
Location: Hyatt Regency Lake Tahoe
Session Chair: Victoria Miller, University of Florida
10:30 AM
Multiscale Model for Colony Breakdown Prediction in Two-Phase Titanium Alloys: Benjamin Begley1; Victoria Miller1; 1University of Florida
For two-phase titanium alloys, predicting the evolution of texture—both local and global—during deformation processing is key to developing highly efficient strategies for colony and microtexture breakdown. This work develops a “open-box” framework linking DEFORM, a commercial finite element model for deformation processing, and the viscoplastic self-consistent (VPSC) model, which predicts texture evolution during plastic deformation. Physical experiments with matched DEFORM simulations are used to validate the link and inform parameterization of the VPSC model. Additional model development includes the integration of non-equilibrium phase fraction calculations, rules for the selection of new α variants during phase transformations, and temperature-dependent critical resolved shear stress ratios. The new framework is then used to investigate the orientation dependence of colony breakdown during complex thermomechanical processes, with the goal of developing a simple parameter for predicting resulting microtexture severity as a function of the starting microstructure and the processing pathway.
10:50 AM
Phase Field Modelling of Microstructural Evolution in Double-Soaked Medium-Manganese Steels: Joshua Mueller1; Alexandra Glover2; John Speer1; Emmanuel De Moor1; 1Colorado School of Mines; 2Los Alamos National Laboratory
Recently, double-soaking of Medium-manganese (Mn) steels has been proposed to produce multiphase microstructures consisting of martensite and austenite, alternative to ferrite-austenite microstructures produced via single-soak intercritical annealing. By substituting ferrite with martensite, double-soaked medium-Mn steels exhibit increased strength, in excess of 1600 MPa, in combination with appreciable ductility, in excess of 13 pct total elongation. The present work contains modelling efforts for phase evolution and solute redistribution during double-soaking, conducted via DICTRATM and MICRESS®, that corroborate energy dispersive X ray spectrometry (EDS) conducted in a scanning transmission electron microscope (STEM). The modelling elucidates how Mn and carbon (C) redistribution enable the formation of the martensite-austenite microstructure.
11:10 AM
Sharp Phase-Field Modeling of γ" Microstructure Evolution in Ni-base Superalloys: Felix Schleifer1; Yueh-Yu Lin1; Michael Fleck1; Uwe Glatzel1; 1University of Bayreuth
The γ" phase contributes significantly to the superior high-temperature performance of Nb containing Nickel alloys such as IN718. This tetragonal phase precipitates coherently in an fcc solid solution matrix and forms plate-shaped particles. The precipitate shape is determined by the interplay between interfacial energy and elastic lattice distortion. We investigate the formation of such a microstructure using the novel sharp phase-field model and quantify the relation between the precipitate shape and ripening kinetics. We consider tetragonal anisotropy of interfacial energy and misfit strains in two and three dimensions at high volumetric phase fractions. Using the sharp phase-field approach and the theory of precipitate ripening we identify critical parameters for the prediction of γ/γ" microstructure evolution. Based on this extensive description of the microstructure formation we present large-scale simulations of γ/γ" microstructural evolution during heat-treatment and life-time of Ni-based superalloys.
11:30 AM
Microstructure-Sensitive Thermomechanical Forming Simulation Capability: Alexander Staroselsky1; Luke Borkowski1; Masoud Anahid1; 1Raytheon Technologies
A novel modeling capability has been developed which permits consideration of metallic microstructure evolution in thermomechanical forming analyses. The evolution of microstructural features such as crystallographic texture and grain constitutive response are predicted using a crystal plasticity model. This is coupled with the state of the art remeshing/adaptivity capabilities in commercial finite element software LS-DYNA. By allowing remeshing and properly remapping the microstructural features to the new mesh, the modeling framework is able to simulate significantly larger deformation (up to 1000% strain) than traditional crystal plasticity finite element. Thus, the developed model permits large deformation forming operations to be simulated, predicting the final microstructure as well as shear band localization and appearance of localized damage. The model has been calibrated and successfully applied to the high temperature forging of Al-Li 2070 into complex geometries including an airfoil. The model allows its application to a wide range of processes and materials.