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Analysis of first order kinetics for tertiary creep in aisi 304 stainless steel

DSpace at IIT Bombay

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Title Analysis of first order kinetics for tertiary creep in aisi 304 stainless steel
 
Creator PHANIRAJ, C
NANDAGOPAL, M
MANNAN, SL
RODRIGUEZ, P
KASHYAP, BP
 
Subject fracture-behavior
rupture
 
Description 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 973 K with a separate set of constant values of K', epsilon(t), beta' and C-MG. A relationship between steady-state creep rate epsilon over dot(s) , time spent in tertiary creep t(t) and limiting tertiary creep strain epsilon(t) is formulated as epsilon over dot(s) . t(t)/epsilon(t) = 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/lambda; 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 epsilon over dot(s) . t(r) = (epsilon(23).epsilon(f))(1/2); and this relation is compared with the relation proposed by Radhakrishnan, i.e. epsilon over dot(s) . t(r) = (epsilon(23)(2) .epsilon(f))(1/3). It is suggested that cavities act as vacancy sinks and accelerate dislocation climb controlled recovery process leading to tertiary creep. Copyright (C) 1996 Acta Metallurgica Inc.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-23T12:58:42Z
2011-12-26T12:56:27Z
2011-12-27T05:45:13Z
2011-08-23T12:58:42Z
2011-12-26T12:56:27Z
2011-12-27T05:45:13Z
1996
 
Type Article
 
Identifier ACTA MATERIALIA, 44(10), 4059-4069
1359-6454
http://dx.doi.org/10.1016/S1359-6454(96)00023-7
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10524
http://hdl.handle.net/10054/10524
 
Language en