Ok, new guy overheated tip and edge after HT

B

b_rogers

Joined
Sep 25, 2011
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114
First off i wanna say i LOVE this forum and all the helpful people on it. Been lurking a while but this is my first post.

New guy to knife making here so go easy..

I have made about 5 knives now from files my local machine shop gave me (I know, I'm calling Aldo) That I annealed, rough ground, then HT and temper.

During the FINAL pass on my latest knife (scandi grind) I somehow let it get hot enough to turn the tip blue (a piece broke off easy) and the entire other side of the edge behind where I was grinding got barely blue as well. I made a jig to get the lines perfect and that kinda hid the blue happening It wasn't as much on the edge, maybe a 1/8 in up the blade.

Did i screw the pooch on this blade? Another HT and temper maybe? FWIW the edge still seems pretty hard and was a pain to sharpen but the tip scares me..


Any and all help appreciated

Brent
 
you have to regrind the tip and re heat treat, I think. I do not know for certain, but I know that you have to build up a lot of heat to blue something. blue heat is higher than temper heat, I am almost sure. just re heat treat. it isn't that bad.
 
Re_Profile and then HT you will be fine...
OK Every maker who HASN'T done this raise there hand... Hummm No hands
 
Thanks for the replies guys, after looking closer the edge is still soft and can be dented easily. Sigh. Back to the fire!
 
It's VERY easy to overheat the edge and tip of a blade .I think you might have gone over 800 F to break off the tip. Take it slow , dunk in water to cool often.
 
Just a little update, after another HT (quenched in water) and temper there are still soft spots on the edge so I'm calling this one a lesson learned..:thumbdn:
 
Fellhoelter said:
Very few, or we wouldn't be spending thousands of dollars on grinders...
Click to expand...

I didn't say there were a lot. I slobber over grinders just as much as the next guy and it has taken a lot of self control not just to go buy one. however, in a very few areas, there are occasional things that files are better at than grinders.
 
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