February 2022 Volume 4

FORGING RESEARCH

Figure 10: Screenshots of each tab within the GUI for running the VPSC-DEFORM framework.

For distribution, a global user interface (GUI) has been built to run this code. Screenshots of the three tabs of the GUI are shown in Figure 10. This framework is still in active development and will be the subject of several forthcoming presentations. It has been developed in a modular way, so that new materials physics can be easily incorporated. For example, several different variant selection subroutines are available, and additional variant selection subroutines can be written and simply added to the list of options in the GUI. Several versions of this code have been provided to ATI already, and an updated version will be made available as they are released. Upon publication of an associated manuscript, the code will be published on GitHub.

Figure 11: Sample of EBSD data collected for validation of the VPSC- DEFORM framework. 3. Project Outcomes In summary, this project developed the preliminary "corotation" concept into a sophisticated modular framework for analyzing site- specific texture evolution during thermomechanical processing of Ti alloys. Future work will quantitatively relate parameters from the simulation to the severity of microtexture. Prediction of site- specic microtexture will enable the development of energy- and cost- efficient processing pathways for Ti alloys. This project involved primarily one graduate student (Benjamin Begley) and two undergraduates (Jennifer Perez and Cameron Frampton). These students learned core Ti metallurgy and the considerations important for developing Ti forging pathways. Through this grant, PI Miller strengthened her connections with ATI and the Air Force Research Laboratory, plus developed new connections at Pratt & Whitney. She is currently preparing 2 proposals that build upon this work: one to be submitted to the National Science Foundation and one as a subcontractor of Pratt & Whitney through the Material Affordability Initiative. Additionally, this work is one of the key reasons why PI Miller was invited as a plenary speaker at the 6thWorld Congress on Integrated Computational Materials Engineering (ICME 2022). Miller intends to continue building upon this work as a core area of her research program. References [1] Benjamin A. Begley, Keith Markham, Michael Mizak, Adam L. Pilchak, and Victoria M. Miller. Prediction of relative globularization rates in alpha + beta titanium alloys as a function of initial crystal orientation. Journal of Materials Research, 35(8):1113{1120, April 2020. Publisher: Cambridge University Press. [2] Thomas R. Bieler and S. L. Semiatin. The origins of heterogeneous deformation during primary hot working of Ti-6Al-4V. International Journal of Plasticity, 18(9):1165-1189, 2002. [3] A.A. Salem and S.L. Semiatin. Anisotropy of the hot plastic deformation of Ti-6Al-4V single-colony samples. Materials Science and Engineering: A, 508(1-2):114-120, May 2009. To discuss this research project contact Victoria Miller at victoria. miller@ufl.edu Figure 11: Sample of EBSD data collected for validation of the VPSC-DEFORM framework. 8

Figure 10: Screenshots of each tab within the GUI for running the VPSC- DEFORM framework. 2. Experimental Validation To ensure the correct physics is incorporated into the VPSC- DEFORM framework, PI Miller has partnered with ATI and begun a campaign of experimental validation. Four rolled plate specimens were produced in ATI's pilot plant, representing a matrix of number of rolling passes and rolling temperature. ATI supplied corresponding DEFORM point track files. PI Miller and her team are actively characterizing the rolled plate specimens, and have run the co-rotation simulations. Details on the extent of agreement between experiment and simulation will be detailed in a forthcoming presentation and at the TMS 2022 Annual Meeting in an oral presentation. Characterization of the experimental specimens has been delayed by new COVID-related procedures at the on campus microscopy facility paired with issues with the microscope itself. However, data collection and analysis is ongoing. Sample data is presented in Figure 11. Figure 10: Screenshots of each tab within the GUI for running the VPSC-DEFORM framework. Figure 11: Sample of EBSD data collected for validation of the VPSC-DEFORM framework.

8

FIA MAGAZINE | FEBRUARY 2022 83