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doi:10.1111/jmi.2009.235.issue-1

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High-pressure torsion of metastable austenitic stainless steel at moderate temperatures

Mine

Haraguchi

Horita

et al. 2015

Philosophical Magazine Letters

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We subjected samples of a 304 metastable austenitic stainless steel to high-pressure torsion (HPT) in the temperature range of 303-573 K, (i.e. at different austenite stabilities), to examine their microstructures and mechanical properties. HPT processing at room temperature led to the formation of a lamellar microstructure with austenitic and martensitic phases, of which sizes were characterised by prior austenite grains, whereas HPT processing at moderate temperatures produced nanostructured austenite grains through mechanical twinning. The nanostructured 304 steel with an average grain size of~70 nm exhibited a fine balance between tensile strength (~1.7 GPa) and reduction of area (~55%).

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