| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
Fracture Strain and Forging Limit Analysis of Polycrystalline Alloys at Elevated Temperatures |
| Author(s) |
Yanfei Gao, Wei Zhang |
| On-Site Speaker (Planned) |
Yanfei Gao |
| Abstract Scope |
A micromechanical model is developed to determine the failure strain of high temperature alloys, accounting for various governing deformation mechanisms at different length scales, including the nucleation of grain boundary cavities, their growth by competition of grain boundary diffusion and grain interior creep, viscous grain boundary sliding, and the emergence of microcracks by coalescence and their evolution to the ultimate failure. This methodology provides quantitative creep rupture lifetime prediction, which finds interesting applications in weldment failure and forging limit analysis. We will also present a mechanistic analysis of the ductility at elevated temperatures, which shows distinctive behavior than those strength-ductility-enhancement methodologies at room temperatures. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |