Friction forging? Anyone heard of this?

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Doc Dan
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Friction forging? Anyone heard of this?

Postby Doc Dan » Tue Feb 16, 2021 8:15 am

https://www.diamondbladeknives.com/friction-forging

This is from the Knives of Alaska parent website. Has anyone heard of friction forging? Does it really accomplish all that they claim?

@Larrin, what do you think?
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Re: Friction forging? Anyone heard of this?

Postby Pokey » Tue Feb 16, 2021 8:34 am

Larrin wrote about that here: https://knifesteelnerds.com/2020/02/

It's his second, of two articles from February of last year.

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Re: Friction forging? Anyone heard of this?

Postby Larrin » Tue Feb 16, 2021 9:26 am

Yes I wrote about it, thanks Pokey. The technology is somewhat interesting though performance claims can be exaggerated, of course.
http://www.KnifeSteelNerds.com - Steel Metallurgy topics related to knives

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Re: Friction forging? Anyone heard of this?

Postby sal » Tue Feb 16, 2021 10:50 pm

Interesting discussions and comments.

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Re: Friction forging? Anyone heard of this?

Postby Doc Dan » Tue Feb 16, 2021 11:26 pm

Ok, I read all of that. Why choose D2 over something like S30V or S90V? How would SPY27 perform with friction forging?
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Re: Friction forging? Anyone heard of this?

Postby sal » Wed Feb 17, 2021 2:07 am

Wayne Goddard, one of my mentors, told me about the program. I purchased one and tested it, and still have it.

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Re: Friction forging? Anyone heard of this?

Postby The Meat man » Wed Feb 17, 2021 3:48 pm

Doc Dan wrote:
Tue Feb 16, 2021 11:26 pm
Ok, I read all of that. Why choose D2 over something like S30V or S90V? How would SPY27 perform with friction forging?
I don't know that friction forging would offer any advantages that the PM process doesn't already give you.
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Re: Friction forging? Anyone heard of this?

Postby Evil D » Wed Feb 17, 2021 4:15 pm

I've heard of "friction welding", maybe it's my pessimistic side but "friction forging" sounds like a sales gimmick.
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Re: Friction forging? Anyone heard of this?

Postby Pokey » Wed Feb 17, 2021 8:48 pm

The Meat man wrote:
Wed Feb 17, 2021 3:48 pm
I don't know that friction forging would offer any advantages that the PM process doesn't already give you.

I can get pretty much any knife I own sharp enough to hurt myself, if I slip. If I'm going to be cutting a material that's known to dull knives I'll use one made of Maximet. So far, for what I use them for, I haven't needed one where it needs to be "springy".

I'll admit, maybe, I'm doing it wrong, but I'll just stick with the ones I've got. :o

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Re: Friction forging? Anyone heard of this?

Postby desmodue » Wed Feb 17, 2021 9:17 pm

Evil D wrote:
Wed Feb 17, 2021 4:15 pm
I've heard of "friction welding", maybe it's my pessimistic side but "friction forging" sounds like a sales gimmick.
It's virtually the same process, spin a carbide tool at high speed while forcing it into the substrate. Great friction is created turning the metal into a hot pliable state, think alloy taffy. The hardest part to wrap your head around is that it doesn't melt. It's right on the edge of melting but instead of creating a re-solidification cast structure you get a homogenous fine grain.

Friction stir can be used to join metals that are not weldable by conventional arc welding processes, like joining high carbon steel to 7075 aluminum
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Re: Friction forging? Anyone heard of this?

Postby Doc Dan » Wed Feb 17, 2021 10:22 pm

sal wrote:
Wed Feb 17, 2021 2:07 am
Wayne Goddard, one of my mentors, told me about the program. I purchased one and tested it, and still have it.

sal
What did you find out? I'd really like to know.
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Re: Friction forging? Anyone heard of this?

Postby Doc Dan » Wed Feb 17, 2021 10:24 pm

Pokey wrote:
Tue Feb 16, 2021 8:34 am
Larrin wrote about that here: https://knifesteelnerds.com/2020/02/

It's his second, of two articles from February of last year.
This was a good article, as usual. But, it does not answer some of my other questions, such as why D2 and not S90V, etc.? How much hardness can be gained and what is the optimum temperature? At what point is the grain the finest and is there such a thing as being too fine?
I Pray Heaven to Bestow The Best of Blessing on THIS HOUSE, and on ALL that shall hereafter Inhabit it. May none but Honest and Wise Men ever rule under This Roof! (John Adams regarding the White House)

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Live pure, speak true, right wrong, follow the King--
Else, wherefore born?" (Tennyson)


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Re: Friction forging? Anyone heard of this?

Postby demoncase » Thu Feb 18, 2021 3:59 am

Interesting. Definitely another take on the differentially hardened approach but I wonder how much more cutting performance it actually liberates in small knives.

I suspect D2 is being used as it's a simple air hardening tool steel and very well characterised.
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