Powder-hardening for HSS

nozh2002

nozh2002

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From Russian Patent site (by Vadim Denisov, Norilsk):

http://www.sibpatent.ru/default.asp?khid=14824&code=552100&all=1&sort=4
http://www.sibpatent.ru/default.asp?khid=14601&code=552100&all=1&sort=4
http://www.sibpatent.ru/default.asp?khid=13151&code=552100&all=1&sort=4
http://www.sibpatent.ru/default.asp?khid=9563&code=552100&all=1&sort=4

Edge is placed in container with special powder (rich C and N content) and cooked in owen 500-550 C. As a result on edge IronCarbonNitrit is formed (I am not sure but it seems like diffusion).

I am sure that Russian wil not be able to start producing this powder which anybody can use in kitchen owen to make good edge :(

Thanks Vassili.
 
As I understand it penetrates (from second link):

"...до 1% на глубину до 0,1 мм; дополнительное образование мелкодисперсных карбидов Fe3W3C..."

Increasing Carbon content to 1% into 0.1mm depth, additional development of smalldispersed (?) carbides Fe3W3C...

Wear resistance increase - 1.3-1.4 times.

Thanks, Vassili.

P.S. As I understand it is some kind of powder bath for blade.

Original post on First Russian Blade Forum:

http://mod-site.net/gb/u/polevik-1.html
 
Yes, that is pretty shallow penetration though, it would be quickly honed away with sharpening unless the edge was very thin, such as with a deep hollow grind. How does it effect toughness?

-Cliff
 
Since the temperatures are given in degrees Celsius you are not going to do this in your household oven. It is not that low a case hardening temperature. You are up in the vicinity of 1000 degrees F.
 
Yes, sorry, forgot that scale on owen in Farenheit.
I think thak 0.1 depth can be increaesed - this is just patent not a product.

I heart about hardening in liquid iron cast which also increase carbon content in the edge surface - more like legend, I think, one guy really tryed this, but without huge success.

Thanks, Vassili.
 
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