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Understanding the effect of nitrogen in austenitic stainless steel on the intergranular stress corrosion crack growth rate in high temperature pure water

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Title Understanding the effect of nitrogen in austenitic stainless steel on the intergranular stress corrosion crack growth rate in high temperature pure water
 
Creator ROYCHOWDHURY, S
KAIN, V
NEOGY, S
SRIVASTAVA, D
DEY, GK
PRASAD, RC
 
Subject Stainless steel
Stress corrosion cracking
Transmission electron microscopy
Twinning
Strain hardening
LOCALIZED DEFORMATION
SHEAR LOCALIZATION
MICROSTRUCTURE
STRAIN
304-STAINLESS-STEEL
SENSITIZATION
BEHAVIOR
METALS
 
Description Understanding the effect of nitrogen content on the crack growth rate (CGR) due to intergranular stress corrosion cracking (IGSCC) in high temperature (288 degrees C) pure water, in non-sensitised and strain-hardened stainless steel (SS) type 304 LN was the focus of this study. Non-sensitised SS containing two different levels of nitrogen (0.08 and 0.16 wt.%) in the solution annealed condition was strain-hardened by cross-rolling at 200 degrees C (warm rolling). It has earlier been reported that SS with a higher nitrogen level in the warm rolled condition has a higher CGR in high temperature pure water. Tensile testing was carried out using both the SS in the warm rolled as well as in the solution annealed condition at 288 degrees C. Samples were prepared for transmission electron microscopy (TEM) from the warm rolled SS and from the tensile tested (at 288 degrees C) specimens. TEM studies indicated that twinning and shear band formation were the major modes of deformation due to rolling at 200 degrees C and these feature were observed to terminate at grain boundaries, leading to regions of higher strain and stresses at grain boundaries. Higher nitrogen SS has higher grain boundary strain and stresses making the grain boundary regions more susceptible to IGSCC, resulting in higher CGR values. At 288 degrees C dislocation entanglement and cross-slip were the predominant modes of deformation. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2014-10-15T10:51:01Z
2014-10-15T10:51:01Z
2012
 
Type Article
 
Identifier ACTA MATERIALIA, 60(2)610-621
http://dx.doi.org/10.1016/j.actamat.2011.09.053
http://dspace.library.iitb.ac.in/jspui/handle/100/14790
 
Language en