About this Abstract |
Meeting |
Superalloys 2021
|
Symposium
|
Superalloys 2021
|
Presentation Title |
Enhancing the Creep Strength of Next Generation Disk Superalloys via Local Phase Transformation Strengthening |
Author(s) |
Timothy Smith, Timothy P. Gabb, Katelun N Wertz, Joshua Stuckner, Laura J. Evans, Ashton J. Egan, Michael J. Mills |
On-Site Speaker (Planned) |
Timothy Smith |
Abstract Scope |
A new disk superalloy has been developed by NASA to improve high temperature creep performance utilizing the recently discovered local phase transformation strengthening mechanism. Creep tests were performed at 760°C and 552MPa, to approximately 0.3% plastic strain, a regime where the formation of ãʹ shearing modes such as superlattice extrinsic and intrinsic stacking faults are active. The new alloy exhibited superior creep performance over the current state-of-the-art superalloys, ME3 and LSHR. High resolution characterization confirmed the formation of the strengthening ç phase along superlattice extrinsic stacking faults and ÷ phase along superlattice intrinsic stacking faults. In addition, creep deformation analysis via scanning transmission electron microscopy appears to show a significant reduction in microtwin formation as compared to LSHR and ME3. This improvement in creep performance was also accompanied by an improvement in both room temperature and high temperature strength. |
Proceedings Inclusion? |
Undecided |