|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Temperature Corrosion of Structural Materials
||The Interaction between Applied Stress and Oxidation in a Coarse Grain Ni-based Superalloy
at Temperatures above 700 °C
||Joshua Ramsay, Mary Taylor, Hugh Evans, Dan Child, Hang Li, Paul Bowen
|On-Site Speaker (Planned)
Environmental targets and the desire for reduced fuel consumption are necessitating improvements in operational efficiency of gas-turbine engines used in aerospace applications. Increasing operating temperature achieves this, but increases susceptibility to oxidation, changing and accelerating failure mechanisms compared to that caused by stress alone. It is important to study how the damage mechanisms interact. To investigate the effect of applied stress on oxidation, oxide thickness measurements were taken using high resolution SEM from cross-sections of shot-peened double-U notched tensile samples subjected to net-section stresses of 900 MPa under R=0 low cycle fatigue in air at 700 and 750 °C. It was found that applied stress had little effect on the external oxide thickness, but increased the internal oxidation depth. The internal oxide measurements are compared to values derived from SAGBO investigations to validate current enhancement factors.
This work was supported by Rolls-Royce Plc. and the EPSRC under EP/HO22309/1 and EP/H500375/1.
||Planned: Supplemental Proceedings volume