Hello,
The replica examination shows some cavities (acc. to focus changing) along grain boundaries. Electropolishing and Kalling's reagent was used in this case.
I have some doubts about cavities formation reason. What is your opinion? Thank you in...
Hello,
There is very interesting requirements for duplex steel weld in EN ISO 13445-4 (PED: steel group 10 weld micro structure examination shall shows adequate microstructure.
What do you think what it means?
My problem: no any intermetallic precipitation, but there are some nitrides...
Hello,
Replica inspection of gas turbine blades was performed. I see some "strangeness" in micro structure. Please see attached (photo at 100x, photo at 500 in next message) Some precipitation along grains boundaries/in grains. Surface was cleaned carefully before replica...
Is it possible so...
Hello,
We have examined SS pipe surface condition. There are some stress corrosion cracks on OD surface. But this subsurface discontinuity (please see attached file) is very strange. What is your opinion? I see the shape of defects like this in the first time in my practice.
Thank you in...
Hello,
Could you help me: what way is it possible to differ single creep cavity and hole from fallen carbide (at grains boundaries)? I have some doubt...
Thank you in advance.
Hello,
Could you give me some advice?
Now I examine structural steel (S235) sample from fired construction.
As I can see there is shperoidisation of perlite and some carbides along grain boundaries. Band structure is disappeared.
Is it really possible this changing after fire...
Dear colleagues,
Could you give me any advice about evaluation of microstructure of steel 38MnVS6.
Only ferritic-perlitic structure is acceptable.
If sample 2 microstructure consists from ferrite and perlite (+sorbite?) microstructure of sample 1 consists from ferrite, perlite, bainite...
Dear colleagues,
Could your help me evaluate/understand micro structure anomaly (please find attached)?
This is DSS weld cup microstructure (photo TV31, TV32) and SDS one (photo SDD_weld) . Welded joint is in solution annealing condition.
It seems sigma phase formation, but very coarse...
Dear all!
We have received very strange SDD pipe welded joint corrosion test (acc NORSOK M-601/ASTM G48) result. Weight loss is 40 g/m2, but no pitting on sample surface. Pickling (5%HF+20%HNO3) was performed before corrosion test.
Micro examination result is acceptable: no continuous...
