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Effects of overall grain boundary nature on localized corrosion in austenitic stainless steels

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Title Effects of overall grain boundary nature on localized corrosion in austenitic stainless steels
 
Creator WASNIK, DN
KAIN, V
SAMAJDAR, I
VERLINDEN, B
DE, PK
 
Subject intergranular corrosion
sensitization
polycrystals
grain boundary
intergranular corrosion
intergranular stress corrosion cracking
thermornechanical treatment
sensitization
austenitic stainless steels
 
Description Thermo-mechanical processing of type 304 and type 316L stainless steels done by (a) cold rolling to a reduction in thickness of 20 to 80 percent and (b) solution annealing to obtain a medium size of grains led to a considerable improvement in resistance to both sensitization and intergranular corrosion. The nature of the resultant grain boundaries was examined in a scanning electron microscope using orientation imaging microscopy in electron back scattered diffraction mode. Fraction of random and special grain boundaries were established for each set of thermo-mechanical processing. After appropriate sensitization treatments, the degrees of sensitization of these stainless steels were evaluated by double loop electrochemical potentiokinetic reactivation tests. Standard ASTM tests were used to evaluate susceptibility to intergranular corrosion (IGC) and intergranular stress corrosion cracking (IGSCC). These studies showed that a particular combination of thermomechanical processing led to formation of over 75 percent random grain boundaries in the steels and this imparted resistance to sensitization and to IGC and IGSCC. This opens a new concept in grain boundary (GB) engineering of a high fraction of random GB increasing the resistance to localized corrosion like IGC and IGSCC. Textural studies were carried out with the help of X-ray and MTM-FHM software. It showed significant change of texture in type 304 stainless steel, while no change in the texture of type 316L stainless steel after cold rolling and annealing.
 
Publisher TRANS TECH PUBLICATIONS LTD
 
Date 2011-10-24T08:03:41Z
2011-12-15T09:11:32Z
2011-10-24T08:03:41Z
2011-12-15T09:11:32Z
2004
 
Type Article; Proceedings Paper
 
Identifier RECRYSTALLIZATION AND GRAIN GROWTH, PTS 1 AND 2,467-470,813-818
0-87849-952-0
0255-5476
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15360
http://hdl.handle.net/100/2127
 
Source 2nd Joint International Conference on Recrystallization and Grain Growth,Annecy, FRANCE,AUG 30-SEP 03, 2004
 
Language English