Abstract
This study describes 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 thermomechanical simulator. The DP1000HD steel exhibited severe LME susceptibility; in contrast, DP800 steel was immune to LME. The DP1200LY steel had a LME response in between these two steels. 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 to 10 s−1. Detailed microscopic investigation of the parent and retained austenite using EBSD was used to link the steel microstructure to its LME response.KeywordsLiquid metal embrittlementAdvanced high strength steelsDP steelsPrior austenite grains
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