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Titolo:
Cyclic deformation and fatigue behaviour of 7Mo-0.5N superaustenitic stainless steel-slip characteristics and development of dislocation structures
Autore:
Heino, S; Karlsson, B;
Indirizzi:
Chalmers Univ Technol, Dept Engn Met, SE-41296 Gothenburg, Sweden ChalmersUniv Technol Gothenburg Sweden SE-41296 1296 Gothenburg, Sweden
Titolo Testata:
ACTA MATERIALIA
fascicolo: 2, volume: 49, anno: 2001,
pagine: 353 - 363
SICI:
1359-6454(20010122)49:2<353:CDAFBO>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERMEDIATE STRAIN AMPLITUDE; LOW-TEMPERATURE FATIGUE; SINGLE-CRYSTALS; PLASTIC STRAIN; NITROGEN; 316L; ALLOY; POLYCRYSTALS; STRESSES; BANDS;
Keywords:
atom probe; low cycle fatigue; transmission electron microscopy (TEM); austenite; dislocations;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Karlsson, B Chalmers Univ Technol, Dept Engn Met, SE-41296 Gothenburg, Sweden Chalmers Univ Technol Gothenburg Sweden SE-41296 urg, Sweden
Citazione:
S. Heino e B. Karlsson, "Cyclic deformation and fatigue behaviour of 7Mo-0.5N superaustenitic stainless steel-slip characteristics and development of dislocation structures", ACT MATER, 49(2), 2001, pp. 353-363

Abstract

The present work concerns the development of dislocation structures and surface slip markings during cyclic straining of a superaustenitic stainless steel. The composition of the tested material was Fe-25Cr-22Ni-7.6Mo-3Mn-0.46N (wt%). Two total strain amplitudes, 2.7x10(-3) and 1.0x10(-2), were employed and specimens were investigated at specific numbers of cycles corresponding to certain stages on the cyclic hardening/softening curve. For both strain amplitudes, the developed dislocation structures are strongly planarand with increasing strain amplitude, the slip mode gradually changes fromsingle slip to multiple slip. The short range ordering between Mo and N, as indicated by an atom probe investigation, is broken down during strain cycling leading to increased slip planarity. Early stages of cycling show dislocation multiplication. With increasing number of cycles, the dislocationsare gradually grouped together in planar bands with high dislocation density, surrounded by dislocation-poor areas. The evolution of such bands is associated with decreasing effective stresses, while the internal stresses are only slightly reduced. Macroscopic slip bands, similar to PSBs, are formed upon prolonged cycling at the high amplitude. The slip markings created on the specimen surface show strong similarities with the bands of localisedslip observed in the dislocation structures of the bulk. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

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Documento generato il 27/10/20 alle ore 04:35:01