Adiabatic heating during hot working

[Shaw123]

Hello,

I’m interest in calculating/measuring the adiabatic heat generated when hot working metals (steels, Ni alloys and Ti alloys). The section sizes I’m interested in vary from 20mm to 300mm and forging temperatures can be 600C (1112F) to 1250C (2282F).
I know that the surface of the material can be measured using an optical pyrometer but the surface temperature is likely differ from the temperature at the centre.
I was thinking about an embedded thermocouple (TC) trial where there is TC placed into the centre of the material that is being hot worked. This will destroy the TC but may generate so data.

Any ideas?

 

[TVP]

Have you thought about simulating this using DEFORM, simufact, QFORM, etc.?

 

[Wrenchbender]

Try calculating the mechanical energy input and assume it all goes into heat. Have to measure force vs distance on the forging press, then integrate. Specific heat of a material is a function of temperature, but it can probably be approximated for the working range. As far as thermocouples, good idea, but I think the key word used, and the major huddle, is ‘embedded’.