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...
Hardness. Part two: why it needs to be known and measured?

Hardness. Part two: why it needs to be known and measured?

09-03-2019
"But why do I need all of this information, how is it related to using knives?” The higher the hardness, the higher the resistance to the Cutting Edge (CT) deformation. Because it may seem that we use a low force on the material we are cutting, but that's not the case. The Cutting Edge is...

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