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Soft zone formation in dissimilar welds between two Cr-Mo steels

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Title Soft zone formation in dissimilar welds between two Cr-Mo steels
 
Creator ALBERT, SK
GILL, TPS
TYAGI, AK
MANNAN, SL
KULKARNI, SD
RODRIGUEZ, P
 
Subject chrome-moly steels
pwht
carbide-rich zone
soft zone
9cr-1mo
2.25cr-1mo
ferritic steels
steam generators
high-temp service
 
Description Two dissimilar weldments between 9Cr-1Mo and 2.25Cr-1Mo ferritic steels have been characterized for their microstructural stability during various postweld heat treatments (PWHTs). The samples for the investigation were extracted from bead-on-plate weldments made by depositing 2.25Cr-1Mo weld metal on 9Cr-1Mo base plate and vice versa. Subsequent application of PWHT resulted in the formation of a soft zone in the low Cr ferritic steel weld or base plate. A carbide-rich hard zone, adjoining the soft zone, was also detected in the high Cr side of the weldment. Unmixed zones in the weld metal provided additional soft and hard zones in the weld metals. The migration of carbon from low-Cr steel to high-Cr steel, driven by the carbon activity gradient, has been shown to be responsible for the formation of soft and hard zones. A carbon activity diagram for 2.25Cr-1Mo/9Cr-1Mo weldments has been proposed to aid in the selection of welding consumables for reducing or preventing the soft zone formation.
 
Publisher AMER WELDING SOC
 
Date 2011-07-17T10:06:30Z
2011-12-26T12:50:14Z
2011-12-27T05:36:24Z
2011-07-17T10:06:30Z
2011-12-26T12:50:14Z
2011-12-27T05:36:24Z
1997
 
Type Article
 
Identifier WELDING JOURNAL, 76(3), S135-S142
0043-2296
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4695
http://hdl.handle.net/10054/4695
 
Language en