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forge welding a billet


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When you initially forge weld your billet and you know you are successful  do you need to keep the billet at  2300 degrees or can you work it at a lower temp. when your forging it out?

 

I was told to always forge the billet at welding temperature...........

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Personally, once the weld is set I work it at full welding heat for a few heats, then gradually work it slightly cooler, but never into the orange range until the blade is almost done.  Using fuel is preferable to delaminations, and a few normalizations fix the grain size.

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17 minutes ago, Matt Walker said:

Plastic deformation also plays a part in grain reduction according to Len Landrum. 

Plastic deformation (with a following austenitization) actually refines grains much more effectively than thermal cycling alone.  One of these days I'll get around to writing up a piece I have been thinking about on the hows and whys of grain refinement.  It'll need a few pictures though.  

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Hey Jerrod, those of who know Len trust him without hesitation, but it is nice to hear you confirm. Seems like when Len made his presentation he mentioned 3 ways to refine grain. Thermal cycling, plastic deformation and if there was a third one I can't remember it.

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Dave Lisch says to forge it as hot and fast as possible to minimize carbon loss.

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