Goal of this work is to study the effect of initial microstructure and different fast austenitization treatments with high heating rates and short dwell times on the transformation behavior of austenite to martensite and the resulting microstructural martensite features. A deeper understanding is gained regarding influences of the time temperature program during austenitization on strain within the martensite. Therefore, specimens with two microstructures, a ferritic/pearlitic and a soft annealed state, are heat treated with heating rates of 1–100 K s–1 to different austenitization temperatures and held for 3 s. Distinct differences in initial microstructures is their cementite size and morphology. For the investigations of the martensitic transformation, its microstructure and its distortions dilatometry experiments are conducted and Electron Back Scattered Diffraction (EBSD) is used. The investigations show that strain and inhomogeneities within the austenite are passed to the martensitic microstructure and lead to higher distortions within the ferritic martensite crystals. Strain within the martensitic microstructure decreases with increasing austenitization temperature and decreasing heating rates. Especially, the carbon content in solution, which is increasing with increasing austenitizing temperature and smaller initial cementite size, is influencing martensitic features, such as martensite start temperature and block sizes.
Mechanical properties of FeCrMn-based steels are of major importance for practical applications. In this work, we investigate mechanical properties of disordered paramagnetic fcc FeCr 10 – 16 Mn 12 – 32 alloys using density functional theory. The effects of composition and temperature changes on the magnetic state, elastic properties and stacking fault energies of the alloys are studied. Calculated dependencies of the lattice and elastic constants are used to evaluate the effect of the solid solution strengthening by Mn and Cr using a modified Labusch-Nabarro model and a model for concentrated alloys. The effect of Cr and Mn alloying on the stacking fault energies is calculated and discussed in connection to possible deformation mechanisms.
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