Hardening the cutting edge of the knife with graphite

I will tell and show you the easy way to temper any knife at home. And then, I will not harden the whole knife, but only its cutting edge, which greatly simplifies the task. If you go into details, then rather, it will not be hardening, but rather cementation, which aims to increase the hardness and wear resistance of the metal.

Hardening of the cutting edge of a knife

Take a knife.
Hardening the cutting edge of the knife with graphite
Passing along the edge of the file, while paying attention to the dull sound and easy grinding of metal. Everything indicates that the knife is made of ordinary steel and is not previously hardened.
Hardening of the cutting edge of the knife with graphite
For hardening, you need graphite. It is best to get graphite from graphite brushes of a generator, a brush-type electric motor. Of course, I did not try it, but you can also get graphite rods from finger batteries, simple pencils. In general, we grind this graphite into powder in any way.It is not necessary to shallow much, without fanaticism.
Hardening the cutting edge of the knife with graphite
Next, I need a metal base on which the graphite powder will lie. I took a piece of galvanized profile from drywall.
Hardening of the cutting edge of the knife with graphite
The process of hardening the edge of the knife also requires a power source. Ideally, this is a pulsed DC welding machine set to a minimum. You can also try to repeat the process with the help of another source, 30-60 volts AC or DC. There is still a dangerous option: to use directly the 220 V network, in series with the incandescent lamp, but this is already fraught, so I do not recommend it. Hardening of the cutting edge of the knife with graphite
Hardening the cutting edge of the knife with graphite
Pouring graphite. We connect the welding machine to the base of the substrate, and the minus to the knife. We set the inverter to the minimum settings and turn it on. We begin the process of edge quenching.To do this, very carefully draw the edge of the knife on a graphite heap. Our task is to: first - do not let the blade touch the base. And the second is to prevent the burning of graphite. In both cases, the blade will be damaged.
Hardening of the cutting edge of the knife with graphite
Hardening of the cutting edge of the knife with graphite
Hardening the cutting edge of a knife with graphite
Ideally, the blade needs to be moved slowly and the graphite flickers to spark. You do not need to lower the knife naturally. As soon as you notice the warming up of the contact place, immediately lift the knife. Hardening of the cutting edge of the knife with graphite
Hardening of the cutting edge of the knife with graphite
The whole process did not last long, about 5 minutes. During this time I managed to walk several times along the entire length of the blade.

Result of hardening the knife

Hardening of the cutting edge of the knife with graphite Take the file and shuffle the blade like the first time. Immediately heard a ringing sound, indicating a high hardness of the metal.Plus, the edge is practically impossible to process.

Hardening the cutting edge of the knife with graphite Cutting a glass jar.

Hardening of the cutting edge of the knife with graphite Notching leaves be healthy! Knocking on a steel nail.

Hardening the cutting edge of the knife with graphite The result is excellent - there is no scratch on the knife.

Hardening the cutting edge of the knife with graphite At the end, I cut the nail with a knife, hitting it with a hammer.

Hardening of the cutting edge of the knife with graphite The knife was not injured! I am not a great expert in the hardening of steel, but the way really works clearly. Local craftsmen say that such hardening increases the hardness of the metal to almost 90 units. I can not disagree or refute, since there is no hardness tester. If you have questions or suggestions, as well as comments, write in the comments.



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