Get the FINEST grain size by heating up FAST! (Part 3)
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- Опубліковано 25 чер 2024
- In the series finale, Tobias Hangler talks to us not just about heat treatment of this Go Mai blade but also grain refinement using purely the Induction Heater! He will discuss the benefits of heating up quickly, normalizing with an induction heater and how to get the finest grain size using an induction heater for knife making! As an added bonus, Tobias will finish the bevels of the blade so you'll get to see his jigs on his Belt Grinder!
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Unglaublich schönes Bunka. Ich würde das so gerne mal testen. 👏👏👏👏👏
Would love to hear Graham and Tobias discuss the need for multiple grain refinement sessions. I loved Grahams view og only needing one, as long as you use the correct temperature
Hey buddy yeah would love to see that too! They have never spoken directly as far as I know but Tobias does agree that normalising should only done once, but grain refinement (dependent on the application or intent of use of the blade) is a warm welcome.
Since Tobias makes high-performance culinary knives, it’s vital for him the finest grain possible for a better quality overall blade.
Loved the series. Tobias really knows his stuff. Neat seeing the fluidized sand and induction heating, something you never really see elsewhere. Also really cool knife grinding jig he made for himself.
Thanks for the feedback @eddo7823! Happy to hear you found value in Tobias videos but just to let you know we have a lot more coming out with Tobias showing us other top tips for knife making so stay tuned!
Also, the jig that he helped make should be available through: www.tobinmachines.at/
💯💥 You guys nailed it again! Thanks for the great content!
Hi GZ thanks for the feedback!
Amazing work guys 👌🏻
Thanks @ModernCooking! 😍
Excellent! The best! Cheers 🍻 👏 ✌
Thanks for taking time to comment!
Hello Tobias great video!
Still working out my process with the apexultra you sent me.
I’ve also sent some to a friend in South Africa (Mr Jack Cn.) which is doing some razor tests aswell.
Should get some proper razors out of the workshop soon i hope
Do you enjoy the content we make for you? If your answer is YES, please check this out too! bit.ly/3kJIwLr (-Vinz)
I don't understand the difference between normalizing and grain reduction because they seem to be a similar process, he says one thing, Graham another. Grain reduction exists only until the metal has cooled and reformed
What would you say is the minimum power requirement to use an induction forge for knife making? I'd love to get one but there's such a range of specifications (and prices!) that it's hard to know where to start. I work mostly in charcoal and propane at the moment but an emission free method would be great.
I want a folding knife in apex ultra….
So here is tough one...
Haengler Messerschmiede say 2-3 times normalizing a blade is grand.
Clarke Knives say normalizing blade once is enough(in one of older series).
Two different schools, both are educated metallurgists...
I am more on Clarke's side as 1 will generally do. Why 3 with the induction heater though? If you are forced to do it fast then austenite will not completely form as it required about 20min of holding at temp to form. Austenisation is a slow process unlike most crystalline transitions. Thus 3 because you will never get full austenite with one pass and have to make up for it with more passes.
@@dragoscoco2173Thing is for grain refinement, you don't want full austenite formation. Austenite grains grow on the grain boundaries of the old structure, and if you freeze before they consume all of the old grains you end up with finer grains from the previous passes. It's a bit fiddly but can be done at a lower temperature in an oven as well. One normalization is fine, a couple grain refinement steps are decent but you can only do so much because they will grow slightly during the austenitize and quench, so in practice you can't get infinitely small grains. But you can get it pretty fine. The finer the grain structure, the faster the quench speed needs to be to fully harden because of more nucleation sites for pearlite formation.
@@mikafoxx2717 Normalization is not for grain size refinement although you can achieve it partially. It is partly an annealing process with a refining of grain composition, not size. I mean the size changes and could be for the better but it hardly matters for final HT.
The main point of normalizing is to prepare the piece for working, machining etc. while relieving stress and homogenizing the solubles.
As a note it is usual to hold the piece 1-2 hours at normalization temps before cool down, it goes full austenite and incorporates all other previous crystal structures.
The final HT is full austenite anyway, and the benefits of small grain size starting position is very limited although not zero.
Definitely not trying to overtake your channel with comments ahaha but. As I got another video (ua-cam.com/video/32LboUj-baw/v-deo.html), I totally understand that but I personally would add the .. useless science behind how HRC actually correlates with toughness (ductility for you Euros
And please don't take any of this stuff critically. I'm not like that.
It's simply science. I don't make it anything more or less.
And I know I don't know what y'all do either! I well know this. Hah.
I appreciate the input!
Have to say it has been an interesting series, don't have much interest in some of that tech as I wouldn't use it, none the less some very interesting tools being used