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%0 Thesis
%A Mosecker, Linda
%T Materials design of high nitrogen manganese austenitic stainless TWIP steels for strip casting
%I Rheinisch-Westfälische Technische Hochschule Aachen
%V Dissertation
%C Aachen
%M RWTH-2016-05336
%P 1 Online Ressource (91 Seiten) : Illustrationen
%D 2016
%Z Veröffentlicht auf dem Publikationsserver der RWTH Aachen University
%Z Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2016
%X High nitrogen manganese austenitic stainless TWIP steels achieve attractive mechanical properties and excellent strain hardening behavior. However, high nitrogen steel melting methods are generally associated with high pressures to enhance the nitrogen solubility in the melt. Thin strip casting offers an attractive option that not only shortens the process route but also allows the alloying with nitrogen at atmospheric pressure. In the present work, the materials design of austenitic Fe-Cr-Mn-N steels for the production by strip casting is presented. A thermodynamics based model using CALPHAD method was developed to predict and control the thermal and mechanical stability of the austenitic phase by calculating the Gibbs free energy change (ΔGγ→ε) and the stacking fault energy (SFE). The application of a non-constant composition-dependent interfacial energy, ϭγ/ε, is introduced and the effect of higher ordered interaction parameter and strain energy term on SFE is discussed. Fe-Cr-Mn-N alloys with nominal chemical composition in the range of 13-14 wt.
%F PUB:(DE-HGF)11
%9 Dissertation / PhD Thesis
%U https://publications.rwth-aachen.de/record/660383