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

Yoji Mine, Daisuke Haraguchi, Zenji Horita, Kazuki Takashima

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4 Citations (Scopus)

Abstract

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%).

Original languageEnglish
Pages (from-to)269-276
Number of pages8
JournalPhilosophical Magazine Letters
Volume95
Issue number5
DOIs
Publication statusPublished - May 4 2015

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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