Open Access
Article Number 05022
Number of page(s) 7
Section Applied Research and Applications: Engineering Materials with MT
Published online 01 September 2009
ESOMAT 2009, 05022 (2009)
DOI: 10.1051/esomat/200905022

Investigations on martensite formation in CrMnNi-TRIP steels

S. Martin1, S. Wolf2, U. Martin1, L. Krüger2 and A. Jahn3

1  Institute of Materials Science, Technische Universität Bergakademie Freiberg, 09596 Freiberg, Germany
2  Institute of Materials Engineering, Technische Universität Bergakademie Freiberg, 09596 Freiberg, Germany
3  Institute of Iron and Steel Technology, Technische Universität Bergakademie Freiberg, 09596 Freiberg, Germany

Published online: 1 September 2009

A new generation of high alloyed cast CrMnNi-TRIP-steels was developed exhibiting high strength (UTS) as well as high uniform elongation for a maximum of energy-absorption. The nature of the high elongation is the formation of α'-martensite in the most deformed areas of the metastable austenitic steel, so that necking is delayed. Because of the low stacking fault energy, due to the high alloying concept, deformation is mainly accompanied by the development of deformation bands in coarse austenitic grains and further the formation of α'-martensite. Within this study, stress-strain curves will be evaluated by the corresponding microstructure information obtained by LOM, SEM and EBSD examinations. The formation of α'-martensite is discussed for tensile and compressive loading at room temperature. The arrangement of martensite within the microstructure and the local deformation dependency of the α'-martensite fraction is considered. Martensite kinetics will be presented for interrupted deformation tests, determined via magnetic balance (MS), EBSD and light optical metallography (LOM).

© Owned by the authors, published by EDP Sciences 2009