ICME-based Titanium Alloys and Processes Design: ICME-Based Titanium Alloys and Processes Design
Sponsored by: TMS Titanium Committee
Program Organizers: Zhi Liang, QuesTek Innovations LLC; Carelyn Campbell, National Institute of Standards and Technology
Monday 2:00 PM
October 10, 2022
Room: 403
Location: David L. Lawrence Convention Center
Session Chair: Zhi Liang, QuesTek Innovations LLC
2:00 PM Invited
Microstructure Design in Titanium Alloys Using 3D Computational Simulation and 3D Experimental Characterization: Dian Li1; Rongpei Shi2; Yufeng Zheng1; 1University of Nevada-Reno; 2Harbin Institute of Technology
The mechanical performance of titanium alloys can be optimized by tuning the hcp structured alpha precipitates in a matrix of bcc structured beta phase. In order to achieve the optimum combination of the strength and ductility in titanium alloys, it is of significant importance to study the critical factors determining the alpha microstructure. In this work, the 3D computational simulation and 3D experimental characterization are used to design the grain boundary alpha microstructure in titanium alloys. The nucleation and growth of grain boundary alpha precipitates was simulated using 3D phase field modeling. The 3D morphology of grain boundary alpha precipitates was characterized by the FIB serial sectioning and reconstructed using the MIPAP image analysis software. The influence of the inclination angle between the habit plane of the selected variant for grain boundary alpha and the hosting grain boundary plane in determining the morphology of grain boundary precipitates will be introduced.
2:30 PM
Physics Based ICME for Similar and Dissimilar Ti-alloy Linear Friction Welding: Jerry Gould1; Michael Eff1; 1Edison Welding Institute
Linear friction is a well-established technology for titanium gas turbine engine component assembly. Applications include both similar and dissimilar alloy combinations. Understanding the impact of processing conditions as well as the influence of dissimilar materials can be greatly aided by relatively simple modeling tools. In this work, an integrated computational materials engineering solution for linear friction welding has been developed based on approximations for both heat transfer and material mechanical response at elevated temperatures. The heat transfer methodology includes a one-dimensional analysis and a Zener approximation for temperature gradients in the workpieces. The material response approximation allows fitting of flow stresses as a function of temperature with an arc-hyperbolic sine function. The resulting model allows prediction of temperature excursions and burn-of characteristics or both similar and dissimilar joints.
2:50 PM
A Modular Framework for the Simulation of Texture Evolution during Thermomechanical Processing of Ti Alloys: Benjamin Begley1; Victoria Miller1; 1University of Florida
For two-phase titanium alloys, predicting the evolution of texture—both macro and micro—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. This modular framework includes the capability to select rules for phase transformation kinetics, variant selection, and temperature-dependent slip system strengths. The new framework is then used to investigate the orientation dependence of colony breakdown and the formation of microtexture during rolling and forging.