Berlin 2012 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 17: Poster Session
MM 17.28: Poster
Monday, March 26, 2012, 17:00–19:00, Poster B
X-ray diffraction studies on low alloyed and high-Mn steels with TRansformation and TWinning Induced Plasticity (TRIP, TWIP) — •Andre Steffen1, Hendrik Quade2, Raphael Twardowski2, Sascha Buthmann2, Michael Paulus1, Christian Sternemann1, Ulrich Prahl2, Wolfgang Bleck2, and Metin Tolan1 — 1Fakultät Physik/DELTA, TU Dortmund, D-44221 Dortmund. — 2Institut für Eisenhüttenkunde, RWTH Aachen, D-52072 Aachen.
High manganese austenitic steels and low alloyed TRIP steels combine high strength and formability. Therefore they get high attention regarding the applications in automotive parts and safety-sensitive areas. The excellent mechanical properties of these steels result from different deformation mechanisms, such as the martensitic transformation and twinning. The TRIP and TWIP effect does not only result in an increase in hardening but also postpones necking or damage to later deformation degrees, which leads to a better formability. For the investigation of the TRansformation Induced Plasticity effect during straining several commercial low-alloyed TRIP steels were analysed. The investigations were carried out in-situ using a tensile testing machine. Further investigations on high-Mn steel tensile TWIP samples with varying microstructure were performed. The microstructure was set by annealing and quenching. Afterwards the samples were pre-strained to 5 %, 10 %, 20 %, 30 % and 40 % of true strain. The tensile tests were carried out for a temperature range of 123 K to 423 K and a strain rate of 0,004 s−1.