Induction hardening depth (core machineability) 2

[jgrady]

Hi,

I have a 3" diameter shaft (4140 per astm a434 gr.bd) which I have spec'd on the drawing to be induction hardened to RC55-58 to a depth of 0.03"

I still want the core to be machinable as I need to machine a bore in it of 2" diameter. I am worried about the core @.5" depth being to hard to machine easily. Is there data available or a way of calculating what the hardness will be at this depth? Any advice is much appreciated.

JG

 

[EdStainless]

Without knowing exactly how your parts will be processed we can only guess.
Talk to your heat treater.

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P.E. Metallurgy, Plymouth Tube

 

[swall]

Induction hardening of a 3" diameter 4140 shaft to a case depth of 0.030" will not affect core properties. At a depth of 0.5", you will encounter some heat affected material, but I don't believe this will be an issue for machinability.