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Anonymous Poster #1

Microstructural Constituents in Incoloy 825 Welds

09/08/2020 8:32 AM

Sirs,

We wish to weld INCOLOY 825 Base Metal using ERNiCrMo-4 Filler wire. We wish to know what should be the expected microstructural constituents in the weld ?

Please help us.

Thanks,

DDN VERMA

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#1

Re: Microstructural Constituents in Incoloy 825 Welds

09/08/2020 10:19 AM

..."This work deals with an investigation on the structure–property relationships of Incoloy 825 weldments. Incoloy 825 was successfully welded using gas tungsten arc welding and different filler wires.

Interfacial and weld zone microstructures were characterized by optical microscopy, X-ray diffraction analysis, and scanning electron microscopy equipped with energy dispersive spectroscopy.

Micro-hardness, tensile and Charpy impact tests were also conducted for the evaluation of the mechanical properties of the weldments.

Ti-rich and Nb-rich phases were identified in the inter-dendritic regions of the weld metals. In the heat-affected zone of the weldments, grain growth and grain boundary thickening were observed.

All the weldments displayed the ductile mode of fractures. ERNiCrMo-3 showed higher hardness, better toughness and tensile properties than the other weld metals.

In addition, ERNiCrMo-3 indicated a higher impact resistance (112 J) compared to the base metal (94 J). Thus, ERNiCrMo-3 filler wire was recommended for welding alloy 825."..

https://link.springer.com/article/10.1007/s13632-017-0353-x

REf...

https://www.specialmetals.com/assets/smc/documents/alloys/incoloy/incoloy-alloy-0825.pdf

http://www.weldwire.net/weld_products/wwnicrmo-4/#:~:text=ERNiCrMo%2D4%20is%20used%20for,alloys%20and%20for%20cladding%20steel.

Why wouldn't you just use 825 wire? What type of welding method are you using? Are you welding the 825 to 825 or a dissimilar metal?

https://www.mdpi.com/2075-4701/10/5/559/htm

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#3
In reply to #1

Re: Microstructural Constituents in Incoloy 825 Welds

09/09/2020 3:16 AM

Sir,

1. I have no idea about availability of 825 wire. In fact, we were asked to use ERNiCrMo-3.

2. Welding method used was GTAW in one case & GTAW + SMAW in another case.

3. We welded 825 to 825. No dissimilar metals.

Thanking You,

DDN VERMA

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Anonymous Poster #1
#2

Re: Microstructural Constituents in Incoloy 825 Welds

09/09/2020 12:46 AM

Sir,

Thank you very much for your expert reply. However, I still have a doubt.

I wish to know whether 'Weld Metal' can have any amount of 'DELTA FERRITE' in addition to 'AUSTENITE' & Ti & Nb compounds ???

Thanks,

DDN VERMA

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