For all you O-1 experts....

MCoughlin · Oct 28, 2005

Hey guys, I recently did a knife in O-1 and I found the micro edge to chip ever so little chips when barely tapping it with a brass rod. It's the very finest part of the edge I'm refering to. Is this a sign of overheating? It's the only one so far this has happened to and I wonder what I did wrong. I did however only quench this one twice as opposed to three times. I test all my O-1 blades before putting the handles on so I'm thinking ...re-heat treat all together? Or quench one more time and then re-temper twice again.
Any ideas???

I have to go watch Batman with my wife now.

Mike

blgoode · Oct 28, 2005

what temperature did you temper it at??? and how long for how many times?
Brian

jimbowie7 · Oct 29, 2005

Try retempering first. Go for a straw color.

MCoughlin · Oct 29, 2005

I tempered at 400f twice letting it cool completely in between. I will try to retemper and will post afterwards. Thanks.
Mike

blgoode · Oct 29, 2005

go to 425.....

MCoughlin · Oct 29, 2005

Ok brian I'll try 425 today twice. I really don't want to loose this one because I did some file work that turned out pretty cool and I don't want it wasted ..ya know?? I'll post later today on how it went. Thanks
Mike

MCoughlin · Oct 29, 2005

jimbowie7 said:
Try retempering first. Go for a straw color.

When I did it at 400 it came out black.
Mike

mete · Oct 29, 2005

What is your heat source for hardening and what is it for tempering ?? It's very easy to overheat the edge and point. Black is not a temper color until you get toward 900F.