Sigma stringers or delta ferrite stringers?
Sigma stringers or delta ferrite stringers?
(OP)
Hi guys,
I have a problem identifying the 'foreign' structure in this 316L heat affected zone. Attached is a photo-micrograph of a SS316L HAZ at 500X. I had used 10% Oxalic acid to etch the structure and found out there's strange structures which looked either like sigma phase or delta ferrite. I know the dark round spots are carbide, but I just can't be sure about the stringers.
Thanks in advance!
I have a problem identifying the 'foreign' structure in this 316L heat affected zone. Attached is a photo-micrograph of a SS316L HAZ at 500X. I had used 10% Oxalic acid to etch the structure and found out there's strange structures which looked either like sigma phase or delta ferrite. I know the dark round spots are carbide, but I just can't be sure about the stringers.
Thanks in advance!





RE: Sigma stringers or delta ferrite stringers?
RE: Sigma stringers or delta ferrite stringers?
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RE: Sigma stringers or delta ferrite stringers?
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Plymouth Tube
RE: Sigma stringers or delta ferrite stringers?