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Low temperature embrittlement of duplex stainless steel: Correlation between mechanical and electrochemical behavior

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Title Low temperature embrittlement of duplex stainless steel: Correlation between mechanical and electrochemical behavior
 
Creator CHANDRA, K
SINGHAL, R
KAIN, V
RAJA, VS
 
Subject aging embrittlement
atom-probe
corrosion-resistance
degrees-c
decomposition
ferrite
cf8
low temperature embrittlement
duplex stainless steel
aging
spinodal decomposition
impact toughness
polarization
 
Description The low temperature embrittlement behavior of duplex stainless steel 2205 was investigated on the basis of changes in mechanical and electrochemical properties after aging for 5000 h at 335, 365 and 400 degrees C. Aging leads to increase in the hardness of delta-ferrite phase. The ferrite hardening was very rapid in the initial stages of aging; thereafter the hardness increase was more gradual at all the aging temperatures. Charpy impact test of the aged samples showed drastic decrease in impact toughness. The value of Charpy impact energy saturated after aging to 5000 h at all the aging temperatures. The embrittlement in the material is known to be caused by spinodal decomposition reaction in which the delta-ferrite decomposes into iron-rich a and chromium-enriched alpha'. For the purpose of non-destructive evaluation of thermal aging embrittlement, double loop electrochemical potentiokinetic reactivation (DL-EPR) test and anodic polarizations in acetic acid and HCl solution were carried out. The peak current density during the anodic scan in DL-EPR test and the peak anodic current density for secondary passivation during polarization in acetic acid increased with increase in aging time. A good linear correlation was observed between the peak anodic current density for secondary passivation during polarization in acetic acid and the microhardness of delta-ferrite phase. (C) 2010 Elsevier BM. .
 
Publisher ELSEVIER SCIENCE SA
 
Date 2011-07-28T11:27:17Z
2011-12-26T12:59:13Z
2011-12-27T05:50:16Z
2011-07-28T11:27:17Z
2011-12-26T12:59:13Z
2011-12-27T05:50:16Z
2010
 
Type Article
 
Identifier MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 527(16-17), 3904-3912
0921-5093
http://dx.doi.org/10.1016/j.msea.2010.02.069
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7389
http://hdl.handle.net/10054/7389
 
Language en