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Titolo:
Competing mechanisms and modeling of deformation in austenitic stainless steel single crystals with and without nitrogen
Autore:
Karaman, I; Sehitoglu, H; Maier, HJ; Chumlyakov, YI;
Indirizzi:
Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 h Engn, College Stn, TX 77843 USA Univ Illinois, Dept Mech & Ind Engn, Urbana, IL 61801 USA Univ Illinois Urbana IL USA 61801 t Mech & Ind Engn, Urbana, IL 61801 USA Univ Gesamthsch Paderborn, Lehrstuhl Werkstoffkunde, D-33095 Paderborn, Germany Univ Gesamthsch Paderborn Paderborn Germany D-33095 5 Paderborn, Germany Siberian Phys Tech Inst, Tomsk 634050, Russia Siberian Phys Tech Inst Tomsk Russia 634050 h Inst, Tomsk 634050, Russia
Titolo Testata:
ACTA MATERIALIA
fascicolo: 19, volume: 49, anno: 2001,
pagine: 3919 - 3933
SICI:
1359-6454(20011114)49:19<3919:CMAMOD>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
STACKING-FAULT ENERGY; DISLOCATION-STRUCTURES; HADFIELD STEEL; AISI 316L; SLIP; ALLOYS; POLYCRYSTALS; BEHAVIOR; KINETICS; STRESS;
Keywords:
twinning; stress-strain relationship measurements; constitutive equations;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Karaman, I Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA TexasA&M Univ College Stn TX USA 77843 lege Stn, TX 77843 USA
Citazione:
I. Karaman et al., "Competing mechanisms and modeling of deformation in austenitic stainless steel single crystals with and without nitrogen", ACT MATER, 49(19), 2001, pp. 3919-3933

Abstract

The stress-strain behavior of low stacking fault energy AISI 316L austenitic stainless steel (SS) (Fc, 17 Cr, 12 Ni, 2 Mn, and 0.75 Si in wt pet, %) single crystals was studied for selected crystallographic orientations ([(1) over bar 11], [001], and [(1) over bar 23]) under tension. Nitrogen (0.4 wt%) was added to the [(1) over bar 11], [001] and [011] crystals. The monotonic deformation of 316L SS was presented with and without nitrogen. The overall stress-strain response was strongly dependent on the crystallographic orientation. Transmission electron microscopy demonstrated for the first time that twinning was present in the [(1) over bar 11] orientation of the nitrogen free 316L SS at very low strains (3%) and in the [(1) over bar 23]and [001] orientations at moderate strains (similar to 10%) as opposed to what is expected from classical twinning theory. Twinning boundaries led toa very high strain hardening coefficient by restraining the dislocation mean free path. The nitrogen addition at the present level caused the following significant changes in the stress-strain response: (1) a considerable increase in the critical resolved shear stresses leading to a deviation from Schmid Law (2) suppression of twinning although planar slip was evident (3)changes in the deformation mechanisms and (4) a decrease in strain hardening coefficients. Most of these differences stemmed from the non-monotonous chan-e in the stacking fault energy with nitrogen concentration and the role of short-range order. A unique strain hardening approach was introduced into a viscoplastic self-consistent (VPSC) formulation. The strain hardeningformulation incorporates length scales associated with spacing between twin lamellae (or grain size and dislocation cell size) as well as statisticaldislocation storage and dynamic recovery. The simulations correctly predicted the stress-strain response of both nitrogen free and nitrogen alloyed 316L SS single crystals. (C) 2001 Acta Materialia Inc. Published by ElsevierScience Ltd. All rights reserved.

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Documento generato il 29/09/20 alle ore 23:14:26