Abstract
Machining and thermal processing can introduce undesirable residual stresses and distortion in titanium alloy components, and although the distribution and magnitude of these residual stresses is highly relevant for component and process design in the aerospace industry, the relationships between processing variables, processing steps, residual stress signature, and subsurface microstructures are not well understood. The current study reports on the preliminary results of experiments designed to mimic typical machining and thermal processing practices for aerospace alpha-beta Ti alloys. Traditional climb cutting and high-speed peel cutting operations are included in CNC machining experiments, and both solution treating and aging heat treatments are considered for thermal processing experiments. Characterization of samples includes strain measurement using the sin2ψ and cosine α methods with x-ray diffraction as well as microstructural characterization using traditional metallographic techniques. The results of this study show a large tool-path dependence for residual stresses in machined surfaces as well as a significant difference in the residual stress behavior for solution treated and quenched compared to solution treated and aged samples of Ti 6Al-4V alloy.
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Acknowledgments
The authors would like to extend their gratitude to Whitcraft LLC. for Granting permission to use their resources. In addition, we thank Peter Glaude of the UConn Castleman Machine Shop, Matt Beebe of the UConn Institute of Materials Science Machine Shop, Dr. Daniela Morales Acosta and Kevin Zhang for their assistance with access to the Rigaku SmartLab instrument, Toshikazu Suzuki at Pulstec for the loan of an X-360 x-ray Analyzer, and UTC Pratt & Whitney for providing technical feedback during the course of this study.
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Frame, L.D., Rambarran, I., Sala, K. et al. Impacts of Machining and Heat Treating Practices on Residual Stresses in Alpha-Beta Titanium Alloys. J. of Materi Eng and Perform 29, 3626–3637 (2020). https://doi.org/10.1007/s11665-020-04843-5
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DOI: https://doi.org/10.1007/s11665-020-04843-5