AEBL - What is this?

Brock Cutlery

Brock Cutlery

Joined
Jan 10, 2015
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If I look in the light at just the right angle there is a little section on my blade with this strange pattern in it.
Anyone know what it is? It's not in the surface, as you can see from the sanding lines.

steelshadows1.jpg
 
Hard to tell from the pic but my best guess is either a small bit of decarb or a small imperfection/inclusion in the steel. I've never seen it in PM steel but I have seen inclusions in cast steel a couple of times.
 
I don't mean to derail this thread. If this is too far adrift I'll delete.
I have an AEB-L blade with issues also though not quite the same. On mine you can see a stripe down the center which appears to be a different color. The bevels are dead flat which rules out differing angles of reflection. The center seems to accept grinding different than the edges. The scratches disappear from the center long before the edges. I've been up and down the grit progression several times between 220 and X16. The higher the grit the more the line shows. It resembles a temper line. Heat by Bos, hardness test at 1/4" from the edge @ Rc 61.5, ground post heat treat. One of 4 blanks cut from the same bar of Aldo's steel. The others do not show this. Talking to Paul at Bos, the blanks are side by side on a belt for the whole heat treatment. Weird.
 

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No worries, I like hearing about AEBL, and I'm sure others do too. I wonder if you might have overheated the grind?
 
I don't believe so. I dip every pass. I ground the others exactly the same with no issues. What I forgot to add is it's almost invisible on the other side.
 
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