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INFLUENCE OF AGING ON INTERGRANULAR CORROSION OF A 25-PERCENT CHROMIUM 5-PERCENT NICKEL DUPLEX STAINLESS-STEEL

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Title INFLUENCE OF AGING ON INTERGRANULAR CORROSION OF A 25-PERCENT CHROMIUM 5-PERCENT NICKEL DUPLEX STAINLESS-STEEL
 
Creator RAVINDRANATH, K
MALHOTRA, SN
 
Subject aging
alpha prime
austenite
chromium carbide
duplex stainless steel
heat treatment
intergranular corrosion
molybdenum
nickel
sigma phase
uns s32550
 
Description Although duplex stainless steels (SS) exhibit good performance in many severe corrosive environments, their corrosion resistance can be hampered by precipitation of chromium (Cr)- and molybdenum (Mo)-rich phases during heat treatments. The influence of aging treatments on intergranular corrosion (IGC) of a commercial 25% Cr-5% nickel (Ni) duplex SS (UNS S32550) was studied. The SS was given aging treatments in the range 773 K to 1,173 K for durations from 6 min to 100 h. Microstructure study of the aged samples indicated the presence of various phases, among them sigma, Cr-rich carbide, secondary austenite, alpha and copper (Cu)-rich precipitate. The influence of these precipitated phases on IGC susceptibility of the 55 was evaluated by the ferric sulfate (Fe[SO4](3))-sulfuric acid (H2SO4) and Cu-copper sulfate-(CuSO4)-H2SO4 tests. Results indicated sigma- and Cr-rich carbide increased IGC susceptibility greatly, as did aging in the range 873 K to 1,073 K.
 
Publisher NATL ASSN CORROSION ENG
 
Date 2011-08-19T02:04:06Z
2011-12-26T12:56:00Z
2011-12-27T05:43:56Z
2011-08-19T02:04:06Z
2011-12-26T12:56:00Z
2011-12-27T05:43:56Z
1994
 
Type Article
 
Identifier CORROSION, 50(4), 318-328
0010-9312
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10191
http://hdl.handle.net/10054/10191
 
Language en