| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Reducing Hydrogen Embrittlement by Controlling Boron Segregation in Martensitic Steel |
| Author(s) |
Hidekazu Minami, Julie Cairney, Matthew Griffith, Yuki Toji, Shinjiro Kaneko |
| On-Site Speaker (Planned) |
Hidekazu Minami |
| Abstract Scope |
Hydrogen embrittlement (HE) is one of the major barriers in the use of ultra-high strength steel sheets for automotive parts. The objective of this study is to clarify the effects of carbon and boron on the HE in boron bearing low carbon martensitic steel. Boron free steel (B-free) and steel with 10 mass ppm (10B) were compared. They were annealed at 1173K and 1273K to control the prior austenite grain size and allow for boron segregation at prior austenite grain boundaries, and then tempered at 423K. In B-free, the increased annealing temperature increased the HE susceptibility, attributed to a larger prior austenite grain size. In contrast, the increased annealing temperature improved the HE properties of the 10B, suggesting that boron segregation has a beneficial effect. EBSD showed that the crack propagation of B-free and 10B in the HE test was intergranular and mainly transgranular, respectively, consistent with this theory. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Mechanical Properties, Characterization |