Controlled generation of ferromagnetic martensite from paramagnetic austenite in AISI 316L austenitic stainless steel

E. Menéndez, Jordi Sort, M. O. Liedke, J. Fassbender, S. Suriñach, M. D. Baró, J. Nogués

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12 Citations (Scopus)

Abstract

The strain-induced austenite (γ) to martensite (α′) transformation in AISI 316L austenitic stainless steel, either in powders or bulk specimens, has been investigated. The phase transformation is accomplished using either ball-milling processes (in powders) - dynamic approach - or by uniaxial compression procedures (in bulk specimens) - quasistatic approach. Remarkably, an increase in the loading rate causes opposite effects in each case: (i) it increases the amount of transformed α' in ball-milling procedures, but (ii) it decreases the amount of α′ in pressed samples. Both the microstructural changes (e.g., crystallite size refinement, microstrains, or type of stacking faults) in the parent γ phase and the role of the concomitant temperature rise during deformation seem to be responsible for these opposite trends. Furthermore, the results show the correlation between the γ → α′ phase transformation and the development of magnetism and enhanced hardness. © 2009 Materials Research Society.
Original languageEnglish
Pages (from-to)565-573
JournalJournal of Materials Research
Volume24
DOIs
Publication statusPublished - 1 Jan 2009

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