About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales III
|
Presentation Title |
A Microstructural Model for Creep-fatigue Damage in Grade 91 Steel |
Author(s) |
Ajey Venkataraman, Andrea Rovinelli, Mark Messner |
On-Site Speaker (Planned) |
Ajey Venkataraman |
Abstract Scope |
Grade 91 is a ferritic-martensitic alloy with excellent high temperature properties up to about 600◦C. Grade 91 is likely to be used in future high temperature reactors, where quantifying and understanding creep-fatigue performance is important. While it is known that the interaction between creep and fatigue is important for long-life applications, the relative contribution of the two mechanisms is not self-evident. Further, the exact mechanism of creep-fatigue interaction is not known. The above questions are addressed in the present work in the form of a microstructurally-informed damage model to predict creep-fatigue performance of Grade 91. Unlike empirical extrapolation techniques, microstructurally-informed models relate the material behavior to underlying, physical, microstructural mechanisms. These models typically extrapolate with better accuracy away from the experimental database. An improved understanding of the creep-fatigue interactions could lead to more efficient microreactor component designs. |