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Titolo:
Stress response behaviour of and microstructural evolution in nimonic PE16LCF tested at temperatures up to 923 K
Autore:
Sundararaman, M; Singh, V; Chen, W; Wahi, RP;
Indirizzi:
Bhabha Atom Res Ctr, Div Mat Sci, Bombay 400085, Maharashtra, India BhabhaAtom Res Ctr Bombay Maharashtra India 400085 5, Maharashtra, India BHU, Dept Met Engn, Varanasi, Uttar Pradesh, India BHU Varanasi Uttar Pradesh India et Engn, Varanasi, Uttar Pradesh, India Hahn Meitner Inst Kernforsch Berlin GmbH, D-1000 Berlin, Germany Hahn Meitner Inst Kernforsch Berlin GmbH Berlin Germany D-1000 , Germany
Titolo Testata:
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
fascicolo: 3, volume: 53, anno: 2000,
pagine: 255 - 261
SICI:
0972-2815(200006)53:3<255:SRBOAM>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
ROOM-TEMPERATURE; FATIGUE BEHAVIOR; ALLOY; PRECIPITATION; DEFORMATION; MECHANISMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Sundararaman, M Bhabha Atom Res Ctr, Div Mat Sci, Bombay 400085, Maharashtra, India Bhabha Atom Res Ctr Bombay Maharashtra India 400085 India
Citazione:
M. Sundararaman et al., "Stress response behaviour of and microstructural evolution in nimonic PE16LCF tested at temperatures up to 923 K", T I INST ME, 53(3), 2000, pp. 255-261

Abstract

The cyclic stress strain behaviour of nickel base superalloy, Nimonic PE16has been studied at a constant strain rate of 4 x 10(-3)s(-1) at differentstrain amplitudes as a function of gamma' particle size for temperatures up to 650 degreesC. Fatigue softening after initial hardening was observed in all samples containing gamma' particles up to an average size of 30 nm tested at room temperature while a saturation in the cyclic stress response behaviour after initial hardening was observed in samples containing gamma' particles above an average size of 21 nm tested st 650 degreesC. Detailed TEM investigation was carried out to understand the observed fatigue behaviour. Fatigue softening was noticed to be associated with shearing of gamma' particles and localisation of slip while saturation behaviour was associated with Orowan looping and non-localisation of slip. Particle size at which the mechanism of deformation changes from shearing to looping decreases with increase of test temperature. This behaviour is explained on the basis ofthe effect of test temperature on the line tension of dislocations. In thecase of shearable precipitates, width of deformation band decreases with increase of temperature reaching that of single slip lines at 923 K. Change of deformation microstructure with testing temperature, gamma' free bands at room temperature, fine gamma' particles within the bands at 673 K and sheared gamma' at 923 K. are explained on the basis of combined effect of mechanical shearing and fatigue enhanced diffusion within bands. Fatigue life decreases with increase of test temperature.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 00:34:18