Soft zone formation in dissimilar welds between two Cr-Mo steels
DSpace at IIT Bombay
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Title |
Soft zone formation in dissimilar welds between two Cr-Mo steels
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Creator |
ALBERT, SK
GILL, TPS TYAGI, AK MANNAN, SL KULKARNI, SD RODRIGUEZ, P |
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Subject |
chrome-moly steels
pwht carbide-rich zone soft zone 9cr-1mo 2.25cr-1mo ferritic steels steam generators high-temp service |
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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.
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Publisher |
AMER WELDING SOC
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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 |
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Type |
Article
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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 |
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Language |
en
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