About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Liquid Metal Embrittlement Behavior of Dual-Phase Steels: The Influence of Microstructure and Strain Rate. |
Author(s) |
Pallavi Pant, Benjamin Hilpert, Holger Shubert, Luke N. Brewer |
On-Site Speaker (Planned) |
Pallavi Pant |
Abstract Scope |
This presentation will describe the liquid metal embrittlement (LME) of dual-phase steels and its relationship with the steel microstructure. These steels are zinc coated for corrosion protection, but during welding, they can experience LME. The LME response was studied by hot ductility testing using a Gleeble thermo-mechanical simulator. The DP1000HD steel exhibited severe LME susceptibility; in contrast, DP800 and DP1200LY steels were immune to LME. The LME severity was temperature-dependent and was limited to a range of temperatures, 750-900˚C. SEM-based fractography showed that when LME occurred, it advanced in an intergranular fashion. Environmental fracture, such as LME, is generally strain rate sensitive, and we will discuss the impact of strain rate on the LME fracture over a range of 10-3 - 10 strain/second. Detailed microscopic investigation of the parent and retained austenite using EBSD and TEM is being used to link the steel microstructure to its LME response. |
Proceedings Inclusion? |
Planned: |
Keywords |
Environmental Effects, Iron and Steel, Joining |