High temperature 718 inconel springs

[welljr]

I wish to use inconel belville washers at up to 600 C for preloading a flange gasket seal. Does anyone have any data on time dependant effects at this temperature for 718 Inconel? I'm not sure of the heat treatment, but they are as received from Solon mfg.

Regards,
Jason

 

[bilge]

Alloy 718 is used as an aerospace fastener at temperatures up to 1200F.

For creep data at temps up to 898K, see: M.C. Chaturvedi (U. Manitoba), "Creep Deformation of Alloy 718," in the book "Superalloy 718. Metallurgy and Applications," E.A. Loria (ed.), TMS, (Warrendale, PA; 1989).

 

[Kenneth]

The most authoritive, comprehensive, free source of this type of materials information can be found in "MIL-HDBK-5", titled "METALLIC MATERIALS AND ELEMENTS FOR AEROSPACE VEHICLE STRUCTURES". It contains test data curves for the alloy and temperature you are interested in. It is available for free download at

http://astimage.daps.dla.mil/docimages/0001/73/51/MILHBK5H.PD5.

If the above URL gives you trouble go to

http://astimage.daps.dla.mil/quicksearch/

and enter "MIL-HDBK-5" in the "Document ID" field. The document is currently at Revison H (select "MIL-HDBK-5H" from the the list of documents to download). It is a huge file, but well worth the download time if you need/use this type of information. You'll need the (free) Adobe Acrobat Reader to view the document.

Another excellent compilation of information (although definitely not free) is the "Aerospace Structural Metals Handbook" (see:

http://mpho.

http://www.ecn.purdue.edu/MPHO/CRDA_Handbooks/asmh).