About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Effect of Carbon Concentration on LCF Properties of N105 Alloy |
| Author(s) |
Kyle Rozman, Stoichko Antonov, Paul Jablonski, Martin Detrois |
| On-Site Speaker (Planned) |
Kyle Rozman |
| Abstract Scope |
While carbon's role in improving creep resistance and grain boundary strengthening in superalloys is established, its influence on low cycle fatigue (LCF) remains nuanced. Previous work on Nimonic 105 (N105) indicated that reduced carbon can compromise creep resistance and phase stability. Conversely, high carbon levels risk carbide clustering and accelerated mode I crack propagation. This investigation quantifies the impact of carbon on LCF behavior in N105. Two variants, nominal (0.15 wt.% C) and low-carbon (0.031 wt.% C), within the alloy specifications, were fabricated and LCF tested at 750°C under R=0.05. The low-carbon N105 exhibited demonstrably inferior fatigue life, correlating directly with its larger observed grain size. Microstructural analysis elucidates the mechanisms by which carbon concentration, particularly its effect on grain morphology and carbide distribution, dictates LCF performance. These findings refine the understanding of carbon as a tool for optimizing both static and cyclic high-temperature mechanical properties in Ni-base superalloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Copper / Nickel / Cobalt, Mechanical Properties |