m4 reheat treat

[ryanryan12]

I have some M4 benchmade blades I'd like to get reheat treated up to 64 or 64.5. Does anyone know of someone who could do it for me?

 

[Leatherface]

give petes heat treat a buzz

they prolly can help ya
D

 

[Nathan the Machinist]

Please allow me to point out that M4 is austenitized at a very high temperature, but does not experience excessive grain growth (the first time around) due to carbides that anchor the grain boundaries. But, upon a second heat will experience extreme grain growth. You can not simply re heat treat a high speed steel. You have to reset it through a normalizing process that is specific to each steel. Make sure whomever reworks your blades understands this.

 

[ryanryan12]

Thank you both. I had Phil Wilson do it before but he's to busy now.

 

[Leatherface]

Please allow me to point out that M4 is austenitized at a very high temperature, but does not experience excessive grain growth (the first time around) due to carbides that anchor the grain boundaries. But, upon a second heat will experience extreme grain growth. You can not simply re heat treat a high speed steel. You have to reset it through a normalizing process that is specific to each steel. Make sure whomever reworks your blades understands this.

wow I didnt know that at all...

thanks bro

 

[Stacy E. Apelt - Bladesmith]

What Nathan said, and also consider the reduction in size after re-finishing.