TY - GEN
T1 - Microstructural evolution in 0.1%C5%Mn steel after intercritical annealing depending on temperature and cooling rate
AU - Steineder, Katharina
AU - Schneider, Reinhold
AU - Krizan, Daniel
AU - Béal, Coline
AU - Sommitsch, Christof
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
KW - AHSS
KW - Cooling rate
KW - Dilatometry
KW - Intercritical annealing
KW - Medium-Mn
KW - TRIP-steel
UR - http://www.scopus.com/inward/record.url?scp=84915773925&partnerID=8YFLogxK
M3 - Conference contribution
T3 - Proceedings - European Conference on Heat Treatment and 21st IFHTSE Congress
SP - 301
EP - 308
BT - Proceedings - European Conference on Heat Treatment and 21st IFHTSE Congress
A2 - Lubben, Thomas
A2 - Zoch, Hans-Werner
A2 - Schneider, Reinhold
T2 - European Conference on Heat Treatment and 21st IFHTSE Congress
Y2 - 12 May 2014 through 15 May 2014
ER -