Dresden 2011 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 40: Nanomaterials III
MM 40.1: Vortrag
Donnerstag, 17. März 2011, 16:15–16:30, IFW B
Continuous recrystallization and mechanical properties of a C45 steel after high pressure torsion — •Mike Haddad1,2, JiangLi Ning2, Ute Hörmann3, Maxim Murashkin4, Yulia Ivanisenko2, and Hans Fecht1,2 — 1Institute of Micro and Nanomaterials, University of Ulm, Ulm, Gemany — 2Institute of Nanotechnology, Karlsruhe Institut of Technology, Karlsruhe, Germany — 3Central Facility for Electron Microscopy, University of Ulm, Ulm, Germany — 4IPAM, Ufa State Aviation Technical University, Ufa, Russia
An initial microstructure of C45 steel (Fe, 0.42-0.5% C, 0.5-0.8% Mn, <0.4% Si, <0.045% S, 0.045% P * All in wt%) was modified from ferritic-pearlitic to bainitic through heating at 900°C for 1 hour and quenching in a lead bath at 500°C for 30 min. The steel was processed by High Pressure Torsion (HPT) at room temperature for 3 and 5 rotations, which led to an ultrafine or nano-scale grained structure. Then the material was annealed at 400°C and 450°C for two hours, respectively. TEM observation showed that continuous recrystallization occurred during the annealing. The yield strength and elongation after annealing at 400°C and 450°C were 1277 MPa, 3%, and 1100 MPa, 11%, respectively. Compared with the mechanical properties before annealing, it was revealed that the continuous recrystallization during annealing led to an enhancement of the ductility, but without sacrificing much of the strength.
Funding by the Deutsche Forschungsgemeinschaft and Russian Foundation for basic research is gratefully acknowledged.