Berlin 2012 – wissenschaftliches Programm

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PV: Plenarvorträge

PV 15: PV XV

PV 15.1: Keynote Talk

Mittwoch, 28. März 2012, 14:00–14:45, H 0104

Nanostructuring of 1 Million tons: Designing ultrastrong and ductile steels — •Dierk Raabe, Dirk Ponge, Pyuck Choi, Julio Millán, Steffanie Sandlöbes, Tilmann Hickel, and Jörg Neugebauer — MPI für Eisenforschung, 40237 Düsseldorf, Germany

We present novel approaches to the atomic-scale understanding and design of advanced steels. Our interest follows three directions: First, steels are complex alloys where minor chemical or structural changes can dramatically alter the thermodynamic, kinetic, and mechanical behavior. Second, steels can undergo multiple phase transformation phenomena that entail a huge variety in the possible kinetic and structural pathways that lead to specific nanostructure and property profiles. Third, we increasingly observe * by using atomic-scale analytical methods (e.g. atom probe, TEM tomography) in conjunction with quantum mechanical simulation methods * that steels can be bottom-up designed by exploiting and designing partitioning, equilibrium defect segregation, and displacive transformation phenomena at an atomic scale. Smart use of these effects allows us to better understand and tailor mankind*s most important mass produced material via self organization, lattice defect-, phase-, and interface-design from an atomic perspective. We give exemplary examples from the fields of maraging TRIP steels, TWIP steels, pearlite, and soft magnetic steels.