## Determine the power required to forge a cylinder

Hi, can anyone help me on the following problem? Thanks a lot in advance!

A 100 mm diameter, low-carbon steel cylinder, 50 mm tall, is forged at
1200°C at a velocity of 1m/s until its height is reduced to 15 mm.
During forging it is assumed that the flow stress is constant at 80 MPa.
Assuming an efficiency of 60% determine the power required to forge
the cylinder.

I do not know what equations to use. I do not have many references (books or website) to look at. I never learnt mechanical metallurgy before and this is my first year in graduate school. in a panic.....
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 I know force times velocity is power. I would assume that this is what you need to use. EDIT: oops didn't realize how old this thread was.

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