| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Effect of Mo Segregation in Hot-rolled Ferritic-bainitic Steels with Nb and Mo Alloying |
| Author(s) |
Renan Lima, Flavia Tereza dos Santos Fernandes Tolomelli, Harison Da Silva Ventura, Jully Ramos Soares , Melina Gamis da Silva, Fernando Cosme Rizzo |
| On-Site Speaker (Planned) |
Renan Lima |
| Abstract Scope |
In the last decade, a lot of work has been conducted on the effects of Nb and Mo addiction in high-strength steels as well as in advanced high-strength steels (AHSS). However, even with all the beneficial effects of those alloying additions, some deleterious results are possible. This contribution presents the results obtained during the production of a new hot-rolled ferritic-bainitic steel. FB steels are currently of interest in the automotive industry due to their high stretch flangeability and high hole expansion ratio. In this particular FB steel Mo segregation was observed, which led to the formation of a harder microconstituent that acted as a stress concentrator. That led to a catastrophic failure with much lower elongation (7%) than expected (~20%). Two similar compositions with Mo and Nb additions were characterized by EBSD and WDS. The effect of Mo segregation in the final structure is presented |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Iron and Steel, Phase Transformations |