Effect of strain and strain path on concurrent microstructure development in advanced high strength steel

The advanced high strength steel(austenitic stainless steel) exhibits outstanding mechanical properties due to the occurrence of two deformation mechanisms: dislocations glide (slip) and phase transformation (austenitic fcc phase to strain induced α martensite (bcc)phase). Both mechanisms have strong dependence on strain and strain paths. In present study, the major strain is more in case of uniaxial drawing (US) followed by biaxial stretching (BS) and plane strain(PS) which is in line with martensite volume fraction. In this paper surface strains were measured by using digital image correlation (DIC) technique and microstructual studies (phase fraction and texture) were carried out at various strain level (low strain (60% deformation), intermediate strain (80% deformation) and high strain (upto failure)) and strain paths using electron back scattered diffraction (EBSD) technique.