Effect of carbon and nitrogen enrichment in the austenitic field on the formation of microstructures and residual stresses in carburized and carbonitrided low-alloyed steel parts: experimental study and simulation
Résumé
Thermochemical treatments like carburizing and carbonitriding allow improving the combinations of properties in low-alloyed steels, which depend mainly on the distributions of residual stresses and microstructures. This contribution presents a full experimental and simulation analysis of the microstructural evolutions highlighting the influence of carbon or nitrogen on the internal stresses evolutions during such treatments. The HEXRD characterization confirms the classical trends of internal and residual stresses in the carburized sample. On the contrary, the presence of nitrogen modifies the transformation chronology and leads to tensile stresses in the surface layer of the nitrided an carbonitrided samples. A coupled thermal, metallurgical, and mechanical model predicting the phase transformation kinetics and the stress evolutions during cooling is assessed based on these in situ experiments combined with post mortem microstructure observations.
| Origine | Fichiers produits par l'(les) auteur(s) |
|---|---|
| Licence |