Evaluation of microstructure and electrochemical corrosion behavior of austenitic 316 stainless steel weld metals with varying chemical compositions
DSpace at IIT Bombay
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Title |
Evaluation of microstructure and electrochemical corrosion behavior of austenitic 316 stainless steel weld metals with varying chemical compositions
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Creator |
PUJAR, MG
DAYAL, R MALHOTRA, SN GILL, TPS |
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Subject |
stainless-steel welds
molybdenum additions ferrite morphology pitting corrosion anodic behavior delta ferrite alloys resistance cracking acid austenitic stainless steel delta-ferrite electrochemical corrosion welding |
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Description |
Austenitic stainless steel weld metals have, in general, inferior corrosion resistance compared with the base metals. This is due to the fact that the weld metal has an inhomogeneous and dendritic microstructure with microsegregation of major elements (i.e., Cr, Mo, and Ni) as well as minor elements (i.e., S and P) at the delta-gamma interface boundaries. The nonuniform alloying element concentration around ferrite particles plays a major role in determining the electrochemical corrosion behavior of such weld metals. Although the presence of ferrite is considered to be detrimental as far as the localized corrosion is considered, its exact role in uniform corrosion is still not clear. The uniform corrosion behavior of an alloy is determined by the fundamental electrochemical parameters of the major alloying elements. In this study, an attempt has been made to correlate the microstructure and uniform corrosion behavior of type 316 stainless steel weld metals with varying concentrations of Cr and Mo, and different ferrite contents. From the empirical equations obtained during the analysis of the electrochemical corrosion data, an attempt has been made to understand the role of Cr, Mo, and ferrite in altering the electrochemical corrosion parameters of the weld metal. Based on the extensive microstructural characterization, a dissolution model for the weld metal in the moderately oxidizing medium has been proposed.
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Publisher |
ASM INTERNATIONAL
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Date |
2011-07-18T15:46:55Z
2011-12-26T12:50:42Z 2011-12-27T05:36:41Z 2011-07-18T15:46:55Z 2011-12-26T12:50:42Z 2011-12-27T05:36:41Z 2005 |
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Type |
Article
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Identifier |
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 14(3), 327-342
1059-9495 http://dx.doi.org/10.1361/10599490523977 http://dspace.library.iitb.ac.in/xmlui/handle/10054/4972 http://hdl.handle.net/10054/4972 |
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Language |
en
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