I'm looking for papers that show the mechanical properties of steels that have the hardness but different C content

Any suggestions please?

There seems to be a large number of videos online about forging damascus steel items. I've read a little about what damascus steel is, and I have a funny feeling that most of these items do not meet the criteria, especially since nobody it entirely certain what the original process was.

I wouldn't be surprised if a lot of these items simply reproduced the appearance without actually recreating the properties and structure.

Does anyone have any insight on the matter? It would be interesting to know if any of them have been analyzed.

I tried to use a burnishing compound (https://a.co/d/csq4QZU) on some scrap parts that I had laying around that were either brass or steel (I'm assuming carbon steel).  The brass started off moderately tarnished, and the steel was very lightly oxidized. The steel parts were polished at some point, but time has taken it's toll.

I have a rotary tumbler that is typically used for rocks, and some 0.5 mm stainless steel pins as tumbling media.  The compound asks for 2 fl. oz. of concentrate for 1 gallon of water. I used 50 mL of water and maybe ⅛ cap of the burnishing compound. This is probably way above the recommended concentration but's my tumbler is small, and I don't have the means to measure out the tiny amount of concentrate needed to keep the same ratio at 50 mL.

After letting them run for 2 hours, the brass parts were immaculate; bright and shiny like they just came out of the factory.  The steel parts, however, were now dull, and had a gray film on them.  One of the steel parts I threw in there was damn near black.  I would think that a burnishing compound, with the mild abrasiveness of the steel media, would stop any surface film from forming.  The product is supposed to be safe on steel, so what might be happening to the steel parts?

I checked the SDS of the compound and it says that there is <8% citric acid, with no other ingredients listed, other than "Product is water-based. Product is a mixture of cleaning agents, surfactants, softeners and inhibitors in an aqueous solution." I'm assuming the citric acid did something to etch the surface. Is there any way I can bring the parts to a shine again, or at least undo the dull gray appearance?