The effect of applied strain range on the fatigue cracking in Nb-A286 iron-base superalloy

Authors
Citation
Bs. Rho et Sw. Nam, The effect of applied strain range on the fatigue cracking in Nb-A286 iron-base superalloy, MATER LETT, 48(1), 2001, pp. 49-55
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS LETTERS
ISSN journal
0167-577X → ACNP
Volume
48
Issue
1
Year of publication
2001
Pages
49 - 55
Database
ISI
SICI code
0167-577X(200103)48:1<49:TEOASR>2.0.ZU;2-G
Abstract
The low cycle fatigue tests of Nb-A286 iron-base superalloy was conducted t o investigate the effect of the applied strain range on the cracking at a g iven temperature of 550 degreesC. The experimental results strongly indicat e that the slope change of Coffin-Manson plot is definitely related with th e deformation mode that controls the fracture mode. The fatigue cracking mo de changes from the transgranular to the predominantly intergranular modes with the applied strain range. The reason for this change of the fatigue cr acking with strain range is induced by the combination of mutually competin g factors involving the grain boundary precipitate, the density of the slip band, and the concentration of stress at points where the slip bands impin ge upon the grain boundaries. (C) 2001 Elsevier Science B.V. All rights res erved.