Application of Fundamental Models for Creep Rupture Prediction of Sanicro 25 (23Cr25NiWCoCu)
| Autor: | Rolf Sandström, Junjing He |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering 02 engineering and technology engineering.material creep Inorganic Chemistry Precipitation hardening Brittleness creep cavitation General Materials Science Composite material Austenitic stainless steel Grain Boundary Sliding 020502 materials Sanicro 25 021001 nanoscience & nanotechnology Condensed Matter Physics austenitic stainless steels Solid solution strengthening 0205 materials engineering Creep Cavitation engineering fundamental models Dislocation 0210 nano-technology |
| Zdroj: | Crystals Volume 9 Issue 12 |
| ISSN: | 2073-4352 |
| DOI: | 10.3390/cryst9120638 |
| Popis: | Creep rupture prediction is always a critical matter for materials serving at high temperatures and stresses for a long time. Empirical models are frequently used to describe creep rupture, but the parameters of the empirical models do not have any physical meanings, and the model cannot reveal the controlling mechanisms during creep rupture. Fundamental models have been proposed where no fitting parameters are involved. Both for ductile and brittle creep rupture, fundamental creep models have been used for the austenitic stainless steel Sanicro 25 (23Cr25NiWCoCu). For ductile creep rupture, the dislocation contribution, solid solution hardening, precipitation hardening, and splitting of dislocations were considered. For brittle creep rupture, creep cavitation models were used taking grain boundary sliding, formation, and growth of creep cavities into account. All parameters in the models have been well defined and no fitting is involved. MatCalc was used for the calculation of the evolution of precipitates. Some physical parameters were obtained with first-principles methods. By combining the ductile and brittle creep rupture models, the final creep rupture prediction was made for Sanicro 25. The modeling results can predict the experiments at long-term creep exposure times in a reasonable way. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|