Kindly tell how the presence of Cr2N can be detected in a duplex stainless steel weld metal. Any kinds of ideas like through XRD, Optical microscopy, SEM microscopy (with recommendation of etchant)?
Dear Dr. Jastej Singh,
I think that the following papers (the first two are present on ResearchGate) may be useful for your work:
- Nitride Precipitation in Duplex Stainless Steel Weld Metal H. Kokawa, E. Tsory, T. H. North ISIJ International 35 (10): 1277-1283, January 1995
- Nitride Precipitation in Weld HAZs of a Duplex Stainless Steel Jinsun LIAO ISIJ International, Vol. 41 (2001), No. 5, pp. 460-467
- Secondary austenite and chromium nitride precipitation in simulated heat affected zones of duplex stainless steels
A.J. Ramirez, S.D. Brandi & J.C. Lippold
Science and Technology of Welding and Joining, Volume 9, 2004 - Issue 4, Pages 301-313, Published online: 04 Dec 2013
- Microstructure and functionality of a uniquely graded super duplex stainless steel designed by a novel arc heat treatment method
Vahid A. Hosseini, Leif Karlsson, Cem Örnek, Pierfranco Reccagni, Sten Wessman, Dirk Engelberg
Materials Characterization, Volume 139, May 2018, Pages 390-400
Best regards, Pierluigi Traverso
I would like to thank you first that you always contribute with your knowledge sir. I have seen both the publications. They have utilized TEM+EDX for such characterization, the facility which I do not have. So a different method is required.
Dear Dr. Jastej Singh ,
perhaps you could compare the morphology of the precipitated compounds found of the bibliographic works, obtained by SEM, with the morphology obtained by a metallographic optical microscope, after a suitable etching attack ....
Good work and best regards, Pierluigi Traverso
You would need to etch with 10% Oxalic or any other relief etchant to reveal any nitrides. As it is a weld and cooling is very fast then they any nitrides would be very fine and difficult to resolve. There was a technique used by Ramirez et al using an SEM on back scatter but we could never get it to work with our old equipment when we tried. Not sure if this is the paper, but he has published a few over the years.
XPS and AES are the powerful machines to carried out surface analysis. Chemical state of element or compound on a surface can be identified by the XPS and XPS spectra.
I would think that it would be extremely difficult to find any as the cooling time in the weld would be very fast leaving insufficient time for any growth of the precipitate. Any ppt would be extremely small.
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