The effect of reduced temperatures on microstructure development in tensile tested high-manganese steel

Publication date: Available online 9 September 2019Source: Materials Science and Engineering: AAuthor(s): Joanna Kowalska, Janusz Ryś, Grzegorz Cios, Wiktor BednarczykAbstractThe current research is part of a project covering several grades of high-manganese steels (20–26 wt% Mn) with different chemical compositions, which were deformed at room and reduced temperatures. In the present paper, the microstructure development is analyzed at the onset of plastic deformation in Fe–Mn–Al–Si steel containing 21.2 wt% Mn. The examination was conducted under conditions of lowering the deformation temperature and aimed to show the influence of reduced temperatures on the occurrence of strain induced phase (martensitic) transformation.The steel samples were subjected to uniaxial deformation in a tensile test at gradually reduced temperatures, starting from 20 °C and then applying the temperatures 0 °C, −50 °C and −150 °C. The present paper includes the analysis of microstructure development and orientation relationships as well as determination of operating deformation mechanisms for samples after 10% of tensile strain. The main part of the research was carried out by means of scanning electron microscopy (SEM), using the method of electron back-scatter diffraction (EBSD).The carried out analysis indicates that within the range of small strains the mechanism controlling deformation behavior of high-manganese steel Fe–21Mn–3Al–3Si was slip of partial dis...
Source: Materials Science and Engineering: A - Category: Materials Science Source Type: research