Banding in Austenitic Stainless Steel
Banding in Austenitic Stainless Steel
(OP)
I recently mounted and etched a 316SS sample and it formed lines across the whole sample. I think it could be banding, can someone give me some information on this phenomena or confirm if this is banding? Also, does anyone know if it would affect the metal's mechanical properties? Finally, how are these 'lines' produced and are they usual or a defect?
Thanks!
Thanks!





RE: Banding in Austenitic Stainless Steel
RE: Banding in Austenitic Stainless Steel
Chocolates,men,coffee: are somethings liked better rich!!
(noticed in a coffee shop)
RE: Banding in Austenitic Stainless Steel
Any additional information would be great!
RE: Banding in Austenitic Stainless Steel
Regards,
Cory
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RE: Banding in Austenitic Stainless Steel
please advise what you mean by crystallographic texture issues?
Thanks
RE: Banding in Austenitic Stainless Steel
I question your etching procedure. If you have access to ASM Handbooks, I would suggest you review the various choices for macro etchants and etchants for microexmination in Volume 9 for stainless steel.
60 mL HNO3 and 40 mL H2O
Electrolytic etch to reveal austenite grain boundaries (but not twins) in austenitic grades. With stainless steel cathode, use at 1.1 V dc, 0.075–0.14 A/cm2 (0.48–0.90 A/in.2), 120 s. With platinum cathode, use at 0.4 V dc, 0.055–0.066 A/cm2 (0.35–0.43 A/in.2), 45 s. Will reveal prior-austenite grain boundaries in solution-treated (but not aged) martensitic precipitation-hardenable alloys and maraging steels
This web site is also handy
http://www.kaker.com/steel/demo/list/chemical.html
RE: Banding in Austenitic Stainless Steel
The strain lines do etch and are supposed to but I'm wondering why? You can still see the microstructure but you have to be at a higher magnification.
RE: Banding in Austenitic Stainless Steel
http
RE: Banding in Austenitic Stainless Steel
Maui
RE: Banding in Austenitic Stainless Steel
Crystallographic texture (also known as preferred orientation) refers to a microstructural feature of what crystal planes are prevalent in a particular section. Just as the crystal structure provides variation of the mechanical properties, it also can lead to variation in chemical or electrolytic etching response. The "strain" effect is an example of this.
Regards,
Cory
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RE: Banding in Austenitic Stainless Steel
Thank you
A7992 & all others
I had a sample of MarAging with the same issue with Banding
of a micro section.
Looks like the same issues.
I was lurking.
Thanks
RE: Banding in Austenitic Stainless Steel
Thanks for the help!
RE: Banding in Austenitic Stainless Steel
www.sei.co.jp/tr_e/pdf/industrial/60-4.pdf
RE: Banding in Austenitic Stainless Steel
RE: Banding in Austenitic Stainless Steel
http
RE: Banding in Austenitic Stainless Steel
The lines are real, I would suggest that the 'worm tracks' are polish/etch artifacts.
If your oxalic over etched then you need to control the power better.
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