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Laser Surface Treatment for Enhancing Intergranular Corrosion Resistance of AISI Type 304 Stainless Steel

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Title Laser Surface Treatment for Enhancing Intergranular Corrosion Resistance of AISI Type 304 Stainless Steel
 
Creator KAUL, R
MAHAJAN, S
KAIN, V
GANESH, P
CHANDRA, K
NATH, AK
PRASAD, RC
 
Subject austenitic stainless-steels
boundary-character-distribution
sensitization
reactivation
behavior
cracking
304l
intergranular corrosion
laser surface treatment
sensitization
stainless steel
 
Description A novel laser surface modification approach to suppress sensitization in AISI 304 (UNS S30400) austenitic stainless steel is described. Surface modification of austenitic stainless steel was carried out with a 10-kW carbon dioxide (CO2) laser in both continuous wave and pulse-modulated modes. After laser surface modification, the material was subjected to a sensitization heat treatment at 923 K for 9 h. The degree of sitization was determined by electrochemical potentiokinetic reactivation test while the susceptibility to intergranular corrosion was determined using the ASTM A262, practice B test. The results of the study demonstrated that the laser-melted surface exhibited significantly higher resistance against sensitization and intergranular corrosion than the base metal. The laser-melted surface, even after being subjected to severe sensitization heat treatment, developed comparable or even a lower degree of sensitization than the base metal in the asreceived condition. Enhanced immunity against sensitization of the laser-treated surface is attributed to its duplex microstructure and higher fraction of low-angle grain boundaries. The highlight of the investigation was that a laser surface melting treatment of unstabilized austenitic stainless steel brings about significant reduction in its Susceptibility to sensitization during subsequent exposure to a susceptible temperature region and to intergranular corrosion during service.
 
Publisher NATL ASSOC CORROSION ENG
 
Date 2011-08-19T02:37:48Z
2011-12-26T12:56:00Z
2011-12-27T05:43:58Z
2011-08-19T02:37:48Z
2011-12-26T12:56:00Z
2011-12-27T05:43:58Z
2008
 
Type Article
 
Identifier CORROSION, 64(10), 755-763
0010-9312
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10197
http://hdl.handle.net/10054/10197
 
Language en