martensite phase reversion-induced nano/ ultrafine grained aisi 304l stainless steel with magnificent mechanical properties

Authors

mohammad shirdel

saber neisi-minaei

hamed mirzadeh

mohammad habibi-parsa

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.

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Journal title:
journal of ultrafine grained and nanostructured materials

Publisher: university of tehran college of engineering

ISSN 2423-6845

volume 48

issue 1 2015

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copyright © 2015-2023