Warpin Woes....

klammer

klammer

Joined
Jan 30, 2009
Messages
580
Bad day for warps - all 3 blades had some bad warping....all blades ~ 9", one of 1/8" 1095, the other 2 were 5/32 1095 (Aldo's). All stock removal, no forging.

HT:
Bring to 1500 (digital kiln)
soak for 5min at temp
quench in Parks 50 heated to 130

I see one once in a while but nothing like this. Normally I just shim the offender during temper to work it out but my tempering oven would not fit all 3 knives attached to flies and required clamps. Had to take turns after the first temper and after 3-4 for some of them only now are they getting straight.

Any steps I can take to minimize this? I seem to get more warps with 1095 than 1084?

Any advice would be appreciated.

Cheers,
Klammer
 
Have you tried a stress relief? If not bring the blade/blades to 1200-1250 and air cool then go back to your regular procedure. I would also drop my Austenitizing temp. to 1475 which is plenty for 1095 and may reduce warping. I also check my blades for straightness right out of the oil. You have a short window that makes correcting slight warpage at this time much easier.
 
Are you going into the quench evenly? I use Canola and pay close attention to how the blade enters the quench - so far no warping
 
Thank you all for the reply's. All blades enter the quench evenly straight edge down then only a slight up and down chopping motion / agitation.

I have never done a stress relief as I had thought that only required for forged blades, I will give it a shot next time. What would be the process / timing for fixing warps out of the quench? Quench for a 7 count, then use a 3 point jig to straighten? How long do I have to do this? I have been using the straighten during temper method as I thought it less likely to snap / crack a blade.
 
The stress relief is just that, a stress relief, it isn't necessary for proper H/T on stock removal. I do find that I have less warpage when I do it. As far as straightening, I leave it in the oil until there is no smoke coming off the blade when I pull it out of the oil. I've never timed it but I'm guessing 25-30 seconds. At this time the blade is still hot enough to need gloves. I wipe off excessive oil, find a light colored background, look down the blade and straighten by hand as necessary. Again, I'm not sure how long this time window is but you can feel when the steel deoesn't want to move anymore. Once it reaches this point if its not straight I stop and do a temper then try other methods such as the one you mentioned in your original post. Hope this helps.
 
BMK said:
Are you going into the quench evenly? I use Canola and pay close attention to how the blade enters the quench - so far no warping
Click to expand...

+1 to this, the first few i made were warped and then I started making sure that the blade went into the oil perfectly vertical, no issues since.
 
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