Microstructural evolution in 0.1%C5%Mn steel after intercritical annealing depending on temperature and cooling rate

Katharina Steineder, Reinhold Schneider, Daniel Krizan, Coline Béal, Christof Sommitsch

Research output: Chapter in Book/Report/Conference proceedingsConference contribution

2 Citations (Scopus)

Abstract

TRansformation Induced Plasticity (TRIP)-assisted Medium-Mn steels, with Mn-contents in the range of 4-10 wt.-%, have recently gained a lot of interest due to their promising mechanical properties. This steel group contains a considerable amount of retained austenite, which is stabilized by C and mainly Mn during intercritical annealing. The present work investigated the influence of annealing temperature and cooling rate on the microstructural evolution by means of dilatometry. Two thermodynamical models for the prediction of optimal annealing temperature and maximum retained austenite content have also been thoroughly evaluated. For further characterization, microstructural observations, EBSD, micro-hardness testing and X-ray diffraction were carried out. The investigations manifested a pronounced influence of both annealing temperature and cooling rate, on the phase fractions of ferrite, austenite and martensite, which must be taken into account by design of batch annealing route for Medium-Mn TRIP steels in order to obtain superior combination of strength and ductility.
Original languageEnglish
Title of host publicationProceedings - European Conference on Heat Treatment and 21st IFHTSE Congress
EditorsThomas Lubben, Hans-Werner Zoch, Reinhold Schneider
Pages301-308
Number of pages8
ISBN (Electronic)9780000000002
Publication statusPublished - 2014
EventEuropean Conference on Heat Treatment and 21st IFHTSE Congress - München, Germany
Duration: 12 May 201415 May 2014

Publication series

NameProceedings - European Conference on Heat Treatment and 21st IFHTSE Congress

Conference

ConferenceEuropean Conference on Heat Treatment and 21st IFHTSE Congress
CountryGermany
CityMünchen
Period12.05.201415.05.2014

Keywords

  • AHSS
  • Cooling rate
  • Dilatometry
  • Intercritical annealing
  • Medium-Mn
  • TRIP-steel

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