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Titolo:
A crystallographic model for the orientation dependence of low cyclic fatigue property of a nickel-base single crystal superalloy
Autore:
Yue, ZF; Tao, XD; Ying, ZY; Li, HY;
Indirizzi:
Northwestern Polytech Univ, Dept Appl Mech, Xian 710072, Peoples R China Northwestern Polytech Univ Xian Peoples R China 710072 , Peoples R China Dept Aeronaut, Inst 608, Zhuzhou 412001, Peoples R China Dept Aeronaut Zhuzhou Peoples R China 412001 hou 412001, Peoples R China
Titolo Testata:
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
fascicolo: 4, volume: 21, anno: 2000,
pagine: 415 - 424
SICI:
0253-4827(200004)21:4<415:ACMFTO>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
YIELD STRESS; TEMPERATURE; BEHAVIOR;
Keywords:
nickel-base single crystal superalloy; low cyclic fatigue; crystallographic orientation dependence; strain rate; cyclic plastic; creep life; crystallographic plastics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Yue, ZF Northwestern Polytech Univ, Dept Appl Mech, Xian 710072, Peoples RChina Northwestern Polytech Univ Xian Peoples R China 710072 s R China
Citazione:
Z.F. Yue et al., "A crystallographic model for the orientation dependence of low cyclic fatigue property of a nickel-base single crystal superalloy", APP MATH ME, 21(4), 2000, pp. 415-424

Abstract

Fully reversed low cyclic fatigue (LCF) tests were conducted on [0 0 1], [0 1 2], [(1) over bar 1 2], [0 1 1] and [(1) over bar 1 4] oriented single crystals of nickel-bared superalloy DD3 with different cyclic strain rates at 950 degrees C. The cyclic strain rates were chosen as 1.0 x 10(-2), 1.33x 10(-3) and 0.33 x 10(-3) s(-1). The octahedral slip systems were confirmed to be activated on all the specimens. The experimental result shows thatthe fatigue behavior depends an the crystallographic orientation and cyclic strain rate. Except [0 0 1] orientation specimens, it is found from the scanning electron microscopy(SEM) examination that there are typical fatiguestriations on the fracture surfaces. These fatigue striations are made up of cracks. The width of the fatigue striations depends on the crystallographic orientation and varies with the total strain range. A simple linear relationship exists between the width and total shear strain range modified byan orientation and strain rate parameter. The nonconformity to the Schmid law of tensile/compressive flaw stress and plastic behavior existed at 95 degrees C, and an orientation and strain rate modified Lall-Chin-Pope ( LCP)model was derived for the nonconformity. The influence of crysrallographicorientation and cyclic strain rate on the LCF behavior can be predicted satisfactorily by the model. In terms of an orientation and strain rate modified total strain range, a model for fatigue life was proposed and used successfully to correlate the fatigue lives studied.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 18:24:11