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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/10197

Title: Laser Surface Treatment for Enhancing Intergranular Corrosion Resistance of AISI Type 304 Stainless Steel
Authors: KAUL, R
MAHAJAN, S
KAIN, V
GANESH, P
CHANDRA, K
NATH, AK
PRASAD, RC
Keywords: austenitic stainless-steels
boundary-character-distribution
sensitization
reactivation
behavior
cracking
304l
Issue Date: 2008
Publisher: NATL ASSOC CORROSION ENG
Citation: CORROSION, 64(10), 755-763
Abstract: 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.
URI: http://dspace.library.iitb.ac.in/xmlui/handle/10054/10197
http://hdl.handle.net/10054/10197
ISSN: 0010-9312
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