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  #1  
Old 11-14-2013, 01:44 PM
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Ray Rogers Ray Rogers is offline
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Metallurgical Opinion Needed

I think someone may have had an experience like this before but I don't think any definitive answer was offered and maybe there won't be one now either but I thought you guys might like to see this. I have etched O1 blades many times before, usually in FeCl, to give them a nice gray appearance and a little rust resistance. This time I use white vinegar for the etch. I don't think the vinegar had anything to do with the results but the etch very quickly brought out a pattern in the steel. So, I left the blade in the vinegar for a whole hour to see if the pattern would go away and get a flat gray but it didn't happen. I did rinse the blade in water a couple of times. Anyway, if some of you with more metallurgical knowledge than I have would care to offer an opinion it could be educational for us all. I'm thinking maybe this O1 is a PM steel and we're seeing the distribution of alloying elements ...


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Last edited by Ray Rogers; 01-12-2015 at 04:21 PM.
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Old 11-14-2013, 04:36 PM
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hmmm interesting Ray, I usually etch my O1 with hot white vinegar and have had interesting results as well but this one on yours seems pretty consistant throughout the blade, where as mine is here and there , cool I like it...............


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Old 11-14-2013, 05:52 PM
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I'd call it Raymascus patterned steel..
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Old 11-14-2013, 06:18 PM
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Metallurgically speaking of course it is probably whitish speckeley looking, like stuff, appearance, kind of.


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Old 11-14-2013, 08:03 PM
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Is it deep , can you feel it ? Or is it only visible ?(seemed logical to ask)
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Old 11-14-2013, 08:13 PM
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The Raymascus (tm) (patent pending) isn't deep but it is deep enough to be felt a little bit ...


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Old 11-14-2013, 09:08 PM
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A knifemaker friend says any blade that turns out with an odd finish you can call "spalted" and people will pay extra for it.

O1 can be weird stuff - esp. to polish. I wonder if this is just a reflection of the inconsistent distribution of alloys.


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Old 11-14-2013, 09:51 PM
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It is clearly ruined and should be sent to me . Ask Kevin Cashen he might know


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Old 11-14-2013, 10:21 PM
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Raymascus !!! brilliant !!

just another reason why O1 continues to be my fave


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Old 11-14-2013, 11:38 PM
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I'd hazard that the nickel and chromium were unevenly distributed in that piece, that's the only thing I can think of.
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Old 11-15-2013, 12:35 AM
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Maybe you could search alloy banding (segregation), and see if that might be possible. Sounds like this was a new piece of steel from a different batch that you hadn't used before. Thanks for showing it, and hope you can solve the mystery.

Craig
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Old 11-15-2013, 05:32 AM
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Don't want to infer anything here, just some questions I'd ask myself.
What grit did you take it to before etching?
How did you clean the blade prior to etch?
Was the vinegar fresh? Warm or hot?

It does not look like alloy banding. A B is normally a much more subtle look and texture with continuous linear lines.
Looks more like something acted as a "resist" on the surface of the steel to me. Could be the steel, try a scrap piece and see if it does it again.


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  #13  
Old 11-15-2013, 06:52 AM
Ed Tipton Ed Tipton is offline
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Ray...That is an interesting piece of work. To me, and maybe I'm just being overly simplistic here, I think this piece just exemplifies the variations we've all seen in steel before. What I'm getting at is that not all O1...nor any other type of steel...is created equal. There are oddities that occur within different batches...and even within the same batch. For me, this is just another fascinating aspect of bladesmithing. CREX's suggestion that you try to duplicate the effect using a piece of scrap from the same batch may result in producing a successful duplication, but it could just as easily produce a piece that does not exhibit the pattern.
Just as there are variations within woods of the same species, there are variations witnin types of steels. None the less...very interesting.
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Old 11-15-2013, 09:11 AM
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I'm confident that whatever the cause may be it is related to the composition of the steel and not to anything I did in finishing the steel. I probably have made other knives from that same bar of steel but didn't etch any of them. I think I'll try Carl's suggestion and look for a scrap to etch ...


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Old 11-15-2013, 09:41 AM
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I don't have anything to offer scientifically as to why this happened (It's way above my pay grade). I will just say that it looks cool!....lol Sorry, I got nothing.


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