@article { author = {Shirdel, Mohammad and Neisi-Minaei, Saber and Mirzadeh, Hamed and Habibi-Parsa, Mohammad}, title = {Martensite phase reversion-induced nano/ ultrafine grained AISI 304L stainless steel with magnificent mechanical properties}, journal = {Journal of Ultrafine Grained and Nanostructured Materials}, volume = {48}, number = {1}, pages = {53-58}, year = {2015}, publisher = {University of Tehran}, issn = {2423-6845}, eissn = {2423-6837}, doi = {10.7508/jufgnsm.2015.01.008}, abstract = {Austenitic stainless steels are extensively used in various applications requiring good corrosion resistance and formability. In the current study, the formation of nano/ ultrafine grained austenitic microstructure in a microalloyed AISI 304L stainless steel was investigated by the advanced thermomechanical process of reversion of strain-induced martensite. For this purpose, samples were subjected to heavy cold rolling to produce a nearly complete martensitic structure. Subsequently, a wide range of annealing temperatures (600 to 800°C) and times (1 to 240 min) were employed to assess the reversion behavior and to find the best annealing condition for the production of the nano/ultrafine grained austenitic microstructure. Microstructural characterizations have been performed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and magnetic measurement, whereas the mechanical properties were assessed by tensile and hardness tests. After thermomechanical treatment, a very fine austenitic structure was obtained, which was composed of nano sized grains of ~ 85 nm in an ultrafine grained matrix with an average grain size of 480 nm. This microstructure exhibited superior mechanical properties: high tensile strength of about 1280 MPa with a desirable elongation of about 41%, which can pave the way for the application of these sheets in the automotive industry.}, keywords = {austenitic stainless steel,martensite reversion,Nanomaterials,phase transformations}, url = {https://jufgnsm.ut.ac.ir/article_53305.html}, eprint = {https://jufgnsm.ut.ac.ir/article_53305_aeec917ca52ab133cf11796e70bf55ce.pdf} }