What does Optical Finishing Temperature Mean?

[BMKR]

Upon looking into quoting a Rene 41 forging, I noticed on the car-tech datasheet it gives a range for optical finishing temperature. what exactly does that mean?

http://cartech.ides.com/datasheet.aspx?i=103&e=134&c=TechArt

It appears in the Hotworking section of the datasheet, I am assuming that it is the temperature of the forging after pressing, would that be a fair assumption?

 

[stanweld]

I would guess that "optical" is a typo error for "optimum".

 

[redpicker]

I agree with stanweld. Probably an autocorrect of an attepmt to spell "optimal", combined with poor proofreading.

rp

 

[blacksmith37]

Or they mean reading the temperature of the work with an optical pryometer.

 

[BMKR]

Yea i have seen this on several sources I'm gonna stand with blacksmith on this one. strange wording

 

[redpicker]

That was my first thought, too. But then I thought, why would the method of temperature measurement affect the proper finishing temperature? That is, why would the "optical temperature" be any different than the "thermocouple temperature"?

rp

 

[BMKR]

some forging alloys are slow cooled post-pressing and cannot spend a whole lot of time exposed to atmosphere, also a thermocouple gets awkward to handle if the piece needs to be placed in an insulated box asap.

 

[IRstuff]

Moreover, "optical" is just so broad a term as to be useless in providing guidance. If they meant temperature as read by a pyrometer, then that temperature is a "pyrometric" temperature, which is much more meaningful a term.

TTFN

FAQ731-376
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[Ron]

Why not just call Cartech and ask?

 

[edstimator]

I can fully understand your reluctance to show your hand but at this point you should write an RFC (request for clarification). Ultimately you will have to live by the spec's anyhow so there it is. Probably a typo but typo or not, better to find out now.

 

[BMKR]

Edstimator,

I originally looked for composition originally, Rene 41 has too much Cobalt to forge with our current equipment, so the forging was no quoted. It was more of a speculative query. Otherwise I would have just called up cartech or any other of the raw material suppliers. Optical finishing temperature was seen on multiple source datasheets cartech was just the one that I had a website for. Thanks for all of your inputs.

JC

 

[Scot927]

Yes I agree as well there is alot of data about optimum finishing temperature, but I have also found companies that do optical finishing. Yet none of them actually define what it is.

Scott Marshall

http://www.buildingsguide.com

 

[cloa]

I thought initially-
Optical finishing probably is just finishing operations to obtain optical properties- primarily mirror finish.
But now I think it is optical properties but mostly to alter glass and pure reflective materials as shown in

http://www.iouoptics.com/mirrors.asp