Phase-field modeling of austenite grain size effect on martensitic transformation in stainless steels
| Autor: | Hemantha Kumar Yeddu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Austenite Materials science General Computer Science General Physics and Astronomy 02 engineering and technology General Chemistry Strain hardening exponent Plasticity 021001 nanoscience & nanotechnology 01 natural sciences Grain size Computational Mathematics Mechanics of Materials Diffusionless transformation Martensite 0103 physical sciences Volume fraction General Materials Science Composite material 0210 nano-technology Strengthening mechanisms of materials |
| Zdroj: | Computational Materials Science. 154:75-83 |
| ISSN: | 0927-0256 |
| DOI: | 10.1016/j.commatsci.2018.07.040 |
| Popis: | A 2D elastoplastic phase-field model is developed to study the effect of prior austenite grain size on martensitic microstructure evolution in stainless steel. The effects of strain hardening and strengthening by grain size reduction (Hall-Petch effect) have been included in the model. The results show that martensite units form in different packets oriented in different crystallographic directions in simulated coarse grains, whereas uni-directional martensitic growth is observed in simulated fine grains. The number of packets and martensite block width increase with increasing grain size. With a decreasing grain size the martensitic transformation start temperature decreases, indicating strengthening of austenite. Once the transformation is initiated, at a given time, simulated fine grains give rise to higher volume fraction of martensite compared to simulated coarse grains. The von Mises equivalent stress and plastic strain are large in simulated fine grains compared to those in simulated coarse grains. The simulation results are in good agreement with experimental results. |
| Databáze: | OpenAIRE |
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