Hardening. Part four: Tempering.

Hardening. Part four: Tempering.

17-04-2020
                           After hardening, the workpiece is hard but brittle. Martensite, which appears in steel during hardening, has a very high stress in it, so that the knife is not brittle, it is necessary to remove some of this stress....
Hardening. Part Three: extinguishing.

Hardening. Part Three: extinguishing.

21-03-2020
How to choose a cooling medium? Again: expertise and experience or trial and error method. Based on the CTT (Continuous Cooling Transformation) diagram for a specific steel! https://en.wikipedia.org/wiki/Continuous_cooling_transformation                             Fig. 1 CCT...
Hardening. Part two: Why?

Hardening. Part two: Why?

12-01-2020
To what temperature I heat to, how long to keep the knife at this temperature: the manufacturer often presents it at a temperature scale but usually without the time of Austenitization! In what do I cool it in, how fast do I do it, are even harder questions. The manufacturer often provides...
Hardening. Part one: The basics.

Hardening. Part one: The basics.

13-11-2019
            Steel (iron alloy (Fe) with carbon (C)) without any special heat treatment, simply cooled after forging on the open air is soft. A knife made like this can bend in your hands. Before our ancestors had learned how to heat-treat steel, they forged it without any heat....
Resistance to cracking.  Part two: how can it be translated into knives and checked at home?

Resistance to cracking. Part two: how can it be translated into knives and checked at home?

20-04-2019
Another method to check the impact strength indirectly is the breaking-point test. Cutting the steel and hitting it with a hammer break the sample (e.g. knife) as in Izod's test. https://en.wikipedia.org/wiki/Izod_impact_strength_test When viewing a broken specimen under a magnifying glass, we...
Resistance to cracking. Part one: what is it?

Resistance to cracking. Part one: what is it?

31-03-2019
The mythical toughness  of steel for knives, everyone has heard about it, nobody has ever seen it. Impact strength is the material's resistance to cracking under sudden, rapid load / impact. This is the effort required to break a standardized sample, on a standard machine, under standardized...

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