Paper Title:
Pre-Primary Stage of Low Strain Rate Creep in Metals
  Abstract

Primarystageofcreepprocessisaperiodwhenthecreeprateisdecreasingduetomi-crostructuredevelopment.Thedislocationdensityevolvestothedynamicequilibriumvaluerelatedtotheappliedstress.Inlow-strainratecreepexperiments,similarstageofdecreasingstrainrateisobservedalongwithapparenttransitiontosteadystate.Nevertheless,deeperanalysisofthevariousparametersofthestageshowsthatthesubstanceoftheprocessmustbedifferent.Themainreasonsare:i)thestrainistoosmallfordislocationsubstructurerearrangement,ii)stressandtemperaturedependenciesofthetransitionstrainandrelaxationtimeoftheprocessdoesnotcorrespondtoanyoftheknownprimarycreepprocesses,iii)thestrainreachedduringthestageisalmostfullyrecoverable,sothatthedeformationisratheranelasticthanplasticone.Thetransitionstrainobservedinlowstrainrateexperimentsthusshouldbetreatedasaspecial“pre-primary”stage,whiletheapparentsecondary(steadystate)stageisinfactpartoftheprimarycreepstage.

  Info
Periodical
Materials Science Forum (Volumes 604-605)
Edited by
Marcello Cabibbo and Stefano Spigarelli
Pages
351-356
DOI
10.4028/www.scientific.net/MSF.604-605.351
Citation
L. Kloc, V. Sklenička, "Pre-Primary Stage of Low Strain Rate Creep in Metals", Materials Science Forum, Vols. 604-605, pp. 351-356, 2009
Online since
October 2008
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Price
$32.00
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