About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation and Damage Mechanisms of High Temperature Alloys
|
Presentation Title |
On the Influence of γ’-particle Size on the Yield Stress Anomaly in Ni-base Single Crystal Superalloys |
Author(s) |
Marc Sirrenberg, David Bürger, Alireza Basir Parsa, Gunther Eggeler |
On-Site Speaker (Planned) |
Marc Sirrenberg |
Abstract Scope |
The yield stress of Ni-base superalloys (SX) can increase with temperature, a phenomenon referred to as yield stress anomaly (YSA). Attempts have been made to study the influence of γ’-particle volume fractions on YSA. In contrast, little is known about the effect of γ’-particle size. In the present work we use a reference material of type CMSX4 which was directionally solidified in a Bridgman process and then exposed to a standard multiple-step heat treatment. We characterize the γ’-particle size distribution of this reference state. We then apply specific heat treatments to produce two additional material states, which have the same γ'-volume fraction but exhibit larger and smaller γ'-particles. The intensity of YSA at temperatures between 750 and 950°C increases with increasing γ'-particle sizes at constant γ'-volume fraction. We discuss the findings in the light of results obtained from quantitative analytical scanning and transmission electron microscopy. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, High-Temperature Materials, Copper / Nickel / Cobalt |