quick question about filing

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facewizard13

Joined
Jun 29, 2015
Messages
62
So I've been out in my garage today making my first knives I've ever made from CRA 1084. I may not entirely know what's going on but, it's a fun learning process. When I was cutting out my knife blanks (4.5'' angle grinder), I noticed that on either side of where I was cutting, some spots on the steel started to turn dark. I'm assuming this is from the friction of the cutoff disc. on one of these knives I was making, when I went to file it at those dark spots, the file didn't seem to want to dig into the steel. Other places that weren't touched by the grinder the file dug right into just fine, with not much effort to file the steel. I was able to muscle down and eventually file those spots down, but it took much more pressure and strokes of the file. My question is, are these knives ruined?, is there any way to fix and or prevent this from happening?
 
The temperature of the grinding caused colored oxidation (you can tell what color the steel got to by the color). The steel may have air hardened by the cut, even non air hardening steels can do so. I've had o1 be impossible to file until annealed.
 
Abrasive cutting generates a lot of heat. Slower will generate less but as the material thins it heats faster so I'm not sure you can completely avoid it.
 
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