About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation and Damage Mechanisms of High Temperature Alloys
|
Presentation Title |
A Comparative Analysis of the Low-cycle Fatigue Behaviors of HAYNES 244 Alloy and Waspaloy |
Author(s) |
Michael G. Fahrmann |
On-Site Speaker (Planned) |
Michael G. Fahrmann |
Abstract Scope |
Waspaloy is a legacy Ni-base superalloy that has found many uses in gas turbine engines, among those being stationary structural parts such as cases. A reasonably low coefficient of thermal expansion and adequate resistance to low-cycle fatigue (LCF) are key requirements for such applications. Recently developed low coefficient of thermal expansion, high strength HAYNES® 244® alloy offers temperature capability to 1400oF (760oC), albeit not at the same level of strength as Waspaloy. A test program was initiated to assess the LCF behaviors of both alloys in uniaxial strain-controlled mode at elevated temperatures. The performance of both alloys is compared, supported by an analysis of their fracture surfaces. Special emphasis is placed on the alloys’ cyclic hardening and softening behavior and its impact on fatigue life. Implications for resistance to thermal fatigue are discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, |