Heat distribute for quenching

G

Gemlingur

Joined
Jun 26, 2015
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2
I´m making a machete out of 0 -1 steel, and I want the edge hotter than the spine, for the effect used in japanese swords, (softer spine for shock absorption).
Is there a way to control heat distribution throughout the blade with a coal forge? I want to do things a bit more traditionally so I don't want to use torches, but this got me stuck. Also, how much will the heat difference affect warping in the blade, and how hot should I have each part of the blade, edge and spine? Using either canola or peanut oil, depending on which you guys/gals think is better. Machete will mainly be used for chopping rather than the jungle-ish vine and grass cutting.
 
I am thinking most just do an edge quench. You may try searching that. You can heat the whole blade and quench the edge or heat the edge and quench the whole thing. Your case it sounds like it would be easier to just quench the edge.
 
Yaki-ire would be difficult with a machete. A edge quench would be simplest, and on a machete would work fine. The second easy method for getting your desired result is to do a full quench and then heavily draw back the spine. In a machete this would be very easy.
 
Stacy E. Apelt - Bladesmith said:
Yaki-ire would be difficult with a machete. A edge quench would be simplest, and on a machete would work fine. The second easy method for getting your desired result is to do a full quench and then heavily draw back the spine. In a machete this would be very easy.
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I agree with this. I believe... and correct me if I'm wrong... that a full quench with selective temper(tempered martensite) will give you that "spring-back" so desirable in a machete. Where as a differential HT(edge quench or clay treatment) will leave you with a mixed structure, more prone to deformation. The narrow cross section of a machete lends itself well to a fully martensitic, tempered treatment.
 
Rick Marchand said:
I agree with this. I believe... and correct me if I'm wrong... that a full quench with selective temper(tempered martensite) will give you that "spring-back" so desirable in a machete. Where as a differential HT(edge quench or clay treatment) will leave you with a mixed structure, more prone to deformation. The narrow cross section of a machete lends itself well to a fully martensitic, tempered treatment.
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Exactly correct.
 
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