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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/7389

Title: Low temperature embrittlement of duplex stainless steel: Correlation between mechanical and electrochemical behavior
Authors: CHANDRA, K
SINGHAL, R
KAIN, V
RAJA, VS
Keywords: aging embrittlement
atom-probe
corrosion-resistance
degrees-c
decomposition
ferrite
cf8
Issue Date: 2010
Publisher: ELSEVIER SCIENCE SA
Citation: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 527(16-17), 3904-3912
Abstract: 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. .
URI: 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
ISSN: 0921-5093
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