Recalesence

A video showing a 1095 knife blade cooling from above critical temperature. As the metal cools the crystalline structure changes. When the crystalline structure changes heat is released causing the metal to get hot again. This is called recalescence.
The opposite reaction, decalescence, occurs as you heat metal. The red hot metal will turn black as the crystalline changes forms. When you see these shadows you know the metal has reached critical temperature.
My website is www.lewisrazors.com
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[@lewisrazors]

Thank you for your kind words and the input. I have been thinking about making a thorough video showing the whole process. Maybe after summer winds down.

[@TomofAllTrades]

Best simple explanation that I have found. Thanks for sharing.

[@lewisrazors]

You are welcome

[@joandar1]

Thanks for your Vids. Every time I see your work or read your advice I learn something new. I just learned to realy important things about heat treatment from this. Cheers from John.

[@SugarcreekForge]

Cool video, Charlie. Thanks for showing this.

[@lewisrazors]

The further past critical temp you go the larger the grain will get. The hotter it gets the larger the grain. To get smaller grain heat to just above critical then cool.

[@lewisrazors]

I wanted to get video of decalesence but could not figure how to video it. Thank you for the encouragement with the videos. As long as you are not going way past critical temp before you take it out and watch for recalesence. The higher the temp the bigger the grain. I would prefer using a magnet, curie point plus a bit more, or watching decalesence.

[@lewisrazors]

I think you are right on with what you said.

[@a1batmang]

Fascinating. Thanks for this interesting video.

[@shoestringeng6473]

Never explained it this well in engineering school! Kudos

[@lewisrazors]

shoestring eng Thanks for the feedback.

[@fishmanga84]

so informative keep it up. Love watching your videos on straight razor making. In saying that I Would love to see a video on needle file work on a razor. Start to finish. Maybe something to consider for a next or future video.. once again great work. Big fan. John.

[@lewisrazors]

Thank you

[@holnrew]

That's so weird. Thanks for sharing.

[@Luke_guy]

this was cool man, thanks

[@anthonykent00]

Wow! That. Was cool!

[@lewisrazors]

anthony kent I am still fascinated by it. I look for the shadows all of the time.

[@liviamichelly5836]

Thank's for the video😁 This help me to see how happend this fenomen

[@lewisrazors]

I would say the curie point plus a littler more time, or after seeing decalasence. I would use simple steels, if you are using a forge and using these methods.

[@SpencerBelanger207]

Do all plain carbon steels do this? Writing a paper on plain carbon steels and would like to mention this reaction in my paper. Thanks for the video.

[@lewisrazors]

I belive it happens in all plain carbon steels, but it is easier to see in high carbon steels. If you are writing a paper you should find a book to cite from.

[@De_leste]

I think this process called "Normalizing", is it right? Or It has a different definition. I learn your video before (grain refining) if I'm not mistake, that video give me the super easy to understand and take me to get more exploration about steel treatment. Thanks from Indonesia.

[@lewisrazors]

Adi Yusuf Kurniadi Yes, you are right, heating to critical then air cooling is normalizing. The main thing I was trying to show in this video was how you can see the "shadows" when the metal changes state.

[@De_leste]

lewisrazors Thankyou sir!!

[@CornLikker]

This might be a stupid question but you say "as a razor". Would this happen with any heated steel or does the shape of a razor or knife have a bearing on this phenomenon?

[@lewisrazors]

The shape has nothing to do with it. It happens with steel, iron and other metals. I used a rough ground blade so that the thin edge parts would start cooling faster than the spine. I thought it made better video.