Waspaloy creep >1000 hr 2

[dcopps]

I am looking for creep properties for Waspaloy beyond the 1000 hr data that seems to be generally available. Any ideas? Thanks.

 

[EdStainless]

considering the vintage of the alloy finding data over 1000hr may be tough. Everything that I have stops there.

Mind if I ask why? If this is a new design then you aren't using this alloy.
You must be working with some old equipment?

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Plymouth Tube

 

[dcopps]

I don't know what equipment we are working with, but I will pass your comment along to my engineer. Knowing what we usually do here, I would be surprised if this were old equipment.

 

[Corgas]

dcopps (Mechanical);

Did you try Haynes International or ATI (Allegheny technologies)?



Corgas,

 

[TVP]

Ed,

I'm curious about your comments regarding use of this alloy for new designs/equipment. Are you assuming the product form to be plate/sheet/strip and the end use is a land-based gas turbine? My familiarity with this alloy is in the form of bar/rod/wire for high temperature fasteners used in aerospace gas turbines, of which this is still contemporary practice. The datasheet from Special Metals shows 14 different SAE AMS and AECMA PrEN standards for Waspaloy bar/rod/wire, and numerous aerospace manufacturers like SPS and Alcoa show "standard" products that they manufacture in Waspaloy.

http://www.specialmetals.com/documents/Waspaloy.pdf

 

[metengr]

Here is a datasheet on Waspaloy that contains stress rupture data to 10,000 hours.

http://www.alleghenytechnologies.com/allvac/pages/PDF/tech/NI001Waspaloy.pdf

 

[EdStainless]

I figured all of the use was in replacement parts for old designs. I look at a chart of stress rupture curves and I see 10 or 20 alloys with higher strength and/or higher service temp and I wonder why a higher performance alloy wouldn't be used to make a new design more reliable and lighter.
There is a lot of spec coverage for 625 still too, but that doesn't make it state of the art.

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Plymouth Tube

 

[TVP]

Ed,

Thanks for the additional information. Would you mind jotting down some of the alloys that have higher creep strength than Waspaloy? I'm curious if any of them are offered in bar/wire/rod for fastener applications. SPS offers Alloy 718 or the proprietary grade Aerex 350, but that is about it in terms of high temperature, creep-resistant grades.

 

[metengr]

TVP;
See the attachment below. I started to compile some data but ran out of time. This is from a Gas Turbine Alloy Handbook.

http://files.engineering.com/getfil...b1e4-3d0b24bed2d7&file=Gas_Turbine_Alloys.pdf