| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Surface Engineering VI
|
| Presentation Title |
Enhanced Phosphatability by Decorating Ferrite Layer on the Surface of a Multi-phase Steel |
| Author(s) |
Dong-Hyun Kim, Joonchul Park, Jae-Dong Joe, Yongghyun Jung, Yonkyun Song, Jae-Sang Lee, Yoon-Uk Heo |
| On-Site Speaker (Planned) |
Dong-Hyun Kim |
| Abstract Scope |
The poor phosphatability in the multi-phase steel is a critical issue to be solved for applying high-strength steel in the car body. The strategy of decorating the ferrite layer on the surface through decarburization annealing is applied to improve the phosphatability in the multi-phase steel. Different surface microstructures were achieved by controlling dew points at - 40, 30, and 60 ℃ during the annealing of cold-rolled sheets. Higher dew point results in thick external oxide on the top surface and deep decarburized ferrite layers around the sub-surface. The external oxide layer degrades the phosphate coverage. On the other hand, more than 90% of phosphate coverage is realized with the decarburized matrix after pickling. The enhanced phosphatability after the decarburization annealing and pickling can be understood by the improved dissolution rate of the ferrite layer. The study gives a way to overcome the intrinsic limitation of poor phosphatability in multi-phase steel. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Iron and Steel, Process Technology |