Header menu link for other important links
Analysis of first order kinetics for tertiary creep in AISI 304 stainless steel
C. Phaniraj, M. Nandagopal, S.L. Mannan, P. Rodriguez,
Published in Elsevier Ltd
Volume: 44
Issue: 10
Pages: 4059 - 4069
The results of constant load creep tests on AISI 304 stainless steel at 873 and 973 K for different test conditions were found to obey the first order kinetics for tertiary creep. Distinct master creep curves were obtained at 873 and 973K with a separate set of constant values of K′, εt, β′ and CMG. A relationship between steady-state creep rate ε̇s, time spent in tertiary creep tt and limiting tertiary creep strain εt is formulated as ε̇s·tt/εt = constant and is found to be valid for all test conditions. Further, this relation is identical to the modified Monkman-Grant relation (MMGR) for the conditions satisfying f = 1/λ; it is postulated that the validity of MMGR is a consequence of first order kinetics. Another important outcome of this study is a generalised relation of the form ε̇s·tr = (ε23·εf)1 2; and this relation is compared with the relation proposed by Radhakrishnan, i.e. ε̇s·tr = (ε223·εf)1 3. It is suggested that cavities act as vacancy sinks and accelerate dislocation climb controlled recovery process leading to tertiary creep. Copyright © 1996 Acta Metallurgica Inc.
About the journal
JournalData powered by TypesetActa Materialia
PublisherData powered by TypesetElsevier Ltd