Reduced-Order Models Correlating Ti Beta 21S Microstructures and Vickers Hardness Measurements

Abstract

Ti Beta 21S alloy is a metastable Ti Beta alloy commonly used in the aerospace industry, especially in jet engines. Components made from this alloy are usually subjected to various thermal histories during service, which leads to significant changes in their microstructures and associated mechanical properties. The central goal of this study is to demonstrate the feasibility of correlating the optical images of the microstructure obtained from heat-treated samples of Ti Beta 21S to their respective Vickers hardness measurements using recently established analyses and statistical quantification approaches based on the principal components of the rotationally invariant 2-point spatial correlations. The correlations extracted in this work can be used for non-destructive diagnostics of in-service components.