Hi everybody, Im working with as welded clad nickel alloy. After welding the specimens are tested with a hot deformation, some of them present cracking.
In a previous analysis of deformation, I did not find liquation cracks, but my analysis was pretty simple, just only in the surface of cladding, not in the bulk material.
I was wondering how can I after deformation identify if these cracks corresponding of liquation cracks or ductility dips cracks?
I consulted the book wrote by Lippold, Welding Metallurgy and Weldability of Nickel-Base Alloys, He says one form to identify liquation craks is seeing the specimens in a SEM tryng to find any trail of liquid. Regarding ductily dips cracks you must see something similar to ductile fracture.
I made these observation with not results. I couldnt see anything, in part because the cracks are not longer.
So, anybody can reccomended me how can iddentify these cracks?
Thank you for your help.
Hi Dear Daniel Guerrero
I recommend listing all indications of Hot cracking so you can separate them easily.
According to J.C. Lippold's welding metallurgy book: DDC are formed in materials with FCC crystal structure along MGBs.
I want to emphasize on MGBs (Migrated grain boundaries). DDC is always formed along MGBs.
It is one of the ways to identify.
a good article about MGBs: researchgate.net/publication/364226201_Migration_of_solidification_grain_boundaries_and_prediction
Best regards
- Badges
- Science topic