|About this Abstract
|2020 TMS Annual Meeting & Exhibition
|Advanced High Strength Steels IV
|Microstructural Origins of Lüders Banding in Medium Manganese Steels
|Rama Srinivas Varanasi, Dirk Ponge, Dierk Raabe
|On-Site Speaker (Planned)
|Rama Srinivas Varanasi
The combination of high strength and ductility makes medium manganese steels promising prospects for the automobile industry. The only pinprick is the presence of Lüders bands, due to its adverse effect on the surface finish during forming operations. The present study is aimed at understanding the complex microstructural origins of Lüders band in medium manganese steels and design the processing routes to eliminate such localized deformation.
We performed quasi in-situ deformation studies with electron channeling contrast imaging (ECCI) to study the discontinuous yielding. In our current work, we discuss the relevance of various mechanisms influencing Lüders band formation, namely: Cottrell atmosphere, strain partitioning in the dual phase microstructure, transformation-induced plasticity (TRIP) in the metastable retained austenite, the morphology of the retained austenite, segregation at the interfaces and the grain size. We will show how Lüders banding can be suppressed by tailoring the microstructure.
|Planned: Supplemental Proceedings volume