Texture evolution and phase transformation of 25Cr-6Mo-5Ni experimental duplex stainless steel during hot and cold rolling

Abstract

An experimental as-cast 25Cr-6Mo-5Ni stainless steel has been solution annealed at 1250 °C and subjected to hot and then cold rolling. X-ray diffraction, optical microscopy and electron backscatter diffraction were used to investigate the effect of hot and cold deformation on the phase transformation and texture evolution. The results revealed that dominant {100}//ND and {110}//ND texture components of martensite is originated by shear strain generated between rolls and sheet surface. The Kernel average misorientation augmented significantly with increased strain and decreased deformation temperature. The internal grain structure becomes more heterogeneous with the dislocation piles up preventing dislocations movement. High localized stresses were developed at grain boundaries due to different deformation of individual grains, which enhanced martensitic transformation in these regions.