Deformation and Damage Mechanisms of High Temperature Alloys: Poster Session
Sponsored by: TMS Structural Materials Division, TMS: High Temperature Alloys Committee
Program Organizers: Mark Hardy, Rolls-Royce Plc; Jonathan Cormier, ENSMA - Institut Pprime - UPR CNRS 3346; Jeremy Rame, Naarea; Akane Suzuki, GE Aerospace Research; Jean-Charles Stinville, University of California, Santa Barbara; Paraskevas Kontis, Norwegian University of Science and Technology; Andrew Wessman, University of Arizona
Monday 5:30 PM
February 28, 2022
Room: Exhibit Hall C
Location: Anaheim Convention Center
G-1: Developing Methods for Microstructural Control of Ni-Cr Binary Alloys: Diego Macias1; Mohammad Umar Farooq khan1; Stephen Raiman1; 1Texas A&M University
High temperature environments require corrosion resistant materials that can withstand extreme environments without failure. Control of microstructural properties through processing can lead to advanced radiation tolerant materials with desirable mechanical properties and enhanced corrosion resistance. For this work, processing methods pathways are examined for grain size control in binary Nickel-Chromium alloys. Different methods of grain refinement were performed to develop repeatable procedures for fabricating alloys with prescribed grain sizes between 1 and 100 microns. Samples of Nickel 8, 16, and 24 wt% Chromium were fabricated by arc melting. Samples were treated by hot rolling, cold rolling, and heat treatments between 1150ºC - 950ºC. Grains from the rolled samples were observed and compared to the as-melted samples. This poster will discuss manufacturing-property relationships between rolling, heat treatments, and grain size in Ni-Cr alloys, and present repeatable methods for tailoring prescribed microstructures in Ni-Cr alloys.
G-2: The Efficacy of Using Flat Plate Oxidation Data as a Proxy for Active Crack Tip Behavior in Waspaloy: Alex Jennion1; Zachary Harris1; James Burns1; 1University of Virginia
The aggressive mechanical and environmental conditions in the hot sections of jet engines leads to creep and oxidation enhanced fatigue damage on high-performance metal components. Understanding the relative contribution of oxidation, cyclic damage accumulation, and creep is needed. Characterization of oxidation at an actively loaded crack tip is complicated, as such, flat plate oxidation behavior is often used as a proxy. The validity of this approach is assessed by characterizing a crack in a fracture mechanics specimen loaded under constant stress intensity at elevated temperatures, chilling it with an argon spray, and cross sectioning the sample to characterize the oxide. These results are compared to flat plate samples elongated between 0 and 18% strain and oxidized under the same conditions. Quantitative comparisons of the oxidation metrics and morphologies are performed and inform evaluation of the efficacy of this approach in the context of understanding and modeling high temperature fatigue behavior.