|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced High-Strength Steels
||Segregation Engineering in Medium Manganese Steels
||Dirk Ponge, Margarita Kuzmina, Alisson Kwiatkoski, Meimei Wang, Stefanie Sandl÷bes, Michael Herbig, Dierk Raabe
|On-Site Speaker (Planned)
In medium manganese steel austenite reversion is of high interest to produce austenite islands to provide a TRIP or TWIP effect to raise strain hardening rate and ductility. We will discuss our results from atom probe tomography and TEM showing that equilibrium segregation of austenite stabilizing elements to dislocations or grain boundaries can enhance formation of embryos or nucleii of austenite. On the other hand, segregation of ferrite forming elements to grain boundaries can be used to avoid formation of austenite. This is of technical interest for heat treatments for very high strength materials like maraging steels where formation of soft austenite during precipitation hardening is degrading the mechanical properties. The effect of Mn segregation to grain boundaries is more complicated: For short heat treatments it can result in grain boundary embrittlement. At longer times the Mn segregation can lead to austenite formation and a dramatic increase in impact toughness.
||Planned: Supplemental Proceedings volume