Titanium4.7
Impact of Residual Stress on the Ingress of Oxygen in Ti-6242S

Tuesday, June 17, 2014: 4:30 PM
Tallahassee 3 (Gaylord Palms Resort )
Dr. Jaimie Tiley , Air Force Research Laboratory, Wright Patterson Air Force Base, Dayton, OH
M. Kirby , Air Force Research Laboratory, Wright Patterson Air Force Base, Dayton, OH
T. Daboika , Air Force Research Laboratory, Wright Patterson Air Force Base, Dayton, OH
Dr. Reji John , Air Force Research Laboratory, Wright Patterson Air Force Base, AFB, OH
Dr. Soumya Nag , University of North Texas, Denton, TX
A. Behera , University of North Texas, Denton, TX
Prof. Rajarshi Banerjee , University of North Texas, Denton, TX
Researchers have shown that high temperature titanium alloys are susceptible to oxygen ingress which degrades mechanical performance.  This research investigates the phase evolution and oxygen ingress in Ti-6242S subject to long time exposures at 650°C.  In addition, sheet samples 90 mil thick were stressed at varying levels by bend tests, mechanical deformation, and shot peening prior to exposure to investigate the impact of residual stresses on deformation mechanisms and oxygen ingress.  Characterization by TEM, SEM and XRD techniques will be discussed.  Ingress depths will be reported for stressed and unstressed samples, including test involving partial pressure atmospheric oxygen conditions.
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