Re: heat transfer in a steel rod ??


"Henry Kolesnik" <kolesnik@xxxxxxxxxxxxx> wrote in message
news:aZjve.2191$5w3.720@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> I don't know if this is the right place to ask this question, but if it's
> not please point me to the correct group.
>
> Back in the fifties I recall heating the end of a 20 inch long piece of 1
> inch cold rolled steel bar stock in a blacksmith forge to red hot. On
> several occasions, instead of hammering the piece on an anvil I would
plunge
> it into the water because someone asked me to do something else. On these
> occasions I noticed that the end that I was holding would seem to get much
> hotter faster when plunged versus when hammering on the piece. For some
> reason the heat traveled to the part I was holding faster when plunged
> versus being forged. Is there a scientific reason for what happened or has
> my memory deceived me?
> tnx
>
> --
>
> 73
> Hank WD5JFR
>
Could it be that on heating a " pulse " of heat starts down the rod.

You would normally forge the rod before the pulse arrived at the cold end.

When you quenched the steel, the " pulse " would continue ( weakened ) and
have arrived at the cold end when you returned to the bar.


--
Jonathan

Barnes's theorem; for every foolproof device
there is a fool greater than the proof.

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