|About this Abstract
|2023 TMS Annual Meeting & Exhibition
|Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
|A New Paradigm for Wrought Superalloys with Superior Fatigue Strength
|Marie Charpagne, JC Stinville
|On-Site Speaker (Planned)
With unmatched mechanical performance at high temperature, wrought Nickel-base superalloys have been used in the energy and aerospace industries for decades. While broad alloy design and microstructure optimization efforts have been made towards tailoring their strength, less attention has been paid to improving their fatigue strength. Recent advancements in digital image correlation have enabled to capture the micro-mechanisms at the origin of fatigue crack initiation, revealing the central role of slip localization, a phenomenon tightly linked to the materials microstructure. Here, we explore a new microstructure design strategy aiming at minimizing the intensity of slip localization. Building-up on concurrent knowledge on microstructure evolution during forming processes (recrystallization, grain growth and phase transformations), we will present several pathways to increase the fatigue performance of these alloys, through the examples of Waspaloy and Rene 65. The efficacy of these strategies will be discussed based on statistical measurements at the micro- and macro-scale.
|High-Temperature Materials, Mechanical Properties, Characterization