Why do you need to temper a steel knife blade after it was hardened?
You can check the answer of the people under the question at Quora “how to temper a knife“
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Why do you need to temper a steel knife blade after it was hardened?
You can check the answer of the people under the question at Quora “how to temper a knife“
About Daisy
To use the knife for further use efficiently we need to temper the blade again and again if it gets harden,
so in that way you can use it for multiple times with replacing the knife and spending more on buying.
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Tempering a hardened blade leads to it being resharpenable and a usable blade if you have a knife made of a tool steel alloy and use a quench table while shaping and forging you will end up with a very brittle blade, so you look at the tempering chart for your alloy and follow the procedure. Some will call for the blade to be quenched in a quenching oil when it is 1200 degrees, when cool reheat to 400 degrees for 20 minutes and quench for 1 minute, stress relieve by light hammering along the length of the back of the blade. This is why quality knives cost so much. Anyone can take a lawnmower blade cut out a knife to shape and grind and polish to a finish shape and even polish out where you turned it blue and make a utility use farm knife. This is because lawnmower blades are made of air hardening tool steel and retain their temper when rough grinding. There are a lot of books out there on the subject just start reading , the internet is a wealth of info if you sort thru the stuff that will kill you.
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Hardened steel is very hard but brittle, tempering reduces tge hardness, but in a controled way to,optimized hardness and,toughness.
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Hardening will tighten the grain structure in the steel and make the blade hard but brittle. Tempering relaxes the grain structure so that the steel is still strong but not brittle.
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