EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

Micromechanical behavior of the dual phase silicon stainless steel alloys during tensile testing has been studied using in-situ electron backscattered diffraction (EBSD). The texture development alongwith the effect of strain on the grain orientation has been studied individually for both the phases. The changes in the grain orientation have been characterized by the inverse pole figure. In the undeformed state γ-austenite grains were found to oriented in the line link <001>-<111> plane-normal. With increasing strain, grains gradually rotated towards their stable end orientation <111> while intensity for the δ-ferrite grains increased in <102> direction. Deformation twins with 60° rotation along the <111> axis was observed in the γ-austenite grains. No deformation twins were observed in the δ-ferrite grains which elucidates that deformation is primarily caused by slip only. However, both slip and twinning are the predominant deformation mechanism in γ-austenite grains. The EBSD phase maps indicate the presence of transformation-induced plasticity where the phase fraction of δ-ferrite increases with the deformation. The present investigation explores the strain accommodation mechanisms in these alloys.
Keywords: Grain rotation, Misorientation, Electron backscattered diffraction (EBSD), Deformation behavior