|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced High-strength Steels
||Impact of Short-range Ordering on the Yield Strength in High Mn Steels
||Simon Sevsek, Wolfgang Bleck
|On-Site Speaker (Planned)
Austenitic steels with high Mn contents up to 30 wt.% and Al contents up to 8 wt.% have been processed for high-strength cold formable steels. Regression analysis-based modeling of the yield strength predicts negative contributions of Mn. Short-range ordered (SRO) C-Mn clusters have been identified as a possible explanation. Recent ab initio studies show that in the Fe-Mn-Al-C system, the formation of Al-C clusters is preferential. Based on the calculation of ordering energies, a model has been developed to predict the contribution of SRO to the yield strength. Depending on the alloying level, the SRO-contribution reaches up to 150 MPa while the yield strength is between 250 and 540 MPa. The prediction based on SRO, solid solution strengthening and grain size effects is in good accordance with experimental data. The impact on the system’s ordering energy resulting from different combinations of Al, Mn and C has been studied in detail.
||Planned: Supplemental Proceedings volume