Guidelines to choose a superalloy ???? 2

[Fred]

I am a little bit lost with all the commercial designations of superalloys : INCONEL, NIMONIC, WASPALLOY, INCOLOY..... I would like to find a general and clear overview of these materials (composition, mechanical properties, advantages and drowbacks) to help me to choose the best one for any applications.

Thanks...

 

[Metalguy]

There are 3 "categories" of superalloys-Fe, Ni and Co based. Ni-based are the strongest at high temp, so are used for rotating parts.

How is it possible that someone in a position to make selections is unfamiliar with them?

 

[Fred]

Thanks for the intention but do you really think your response could help me ))

 

[GraySyracuse]

If you need some help on alloy selection, I recommend "ASM - Metals Reference Book".

What do you need to know about superalloys?

 

[boo1]

I think of the application to choose an alloy.
Strength or Mechanical Properties
Chemical resistance
Heat or Temp resistance
Fabrication Operations
Appearance
Total Cost
Life-cycle Cost


There are a few web sites you can try:

http://www.stainlesscenter.com/data/primer.htm

http://www.nidi.org/

http://www.matweb.com/index.asp?ckck=1

http://www.suppliersonline.com/research/

http://www.metalinfo.com/product.cfm

http://www.timet.com/

 

[Fred]

Many thanks for all the links....

 

[Metalguy]

Fred,

Well, the first part could help a little. The second part was for MY info, not yours. When dealing with something like superalloys, the USUAL selection method is to start with someone who is very familiar with them-either within the company or a tech. person from a supplier. Because of their complexity, it takes years to become familiar with them and their characteristics. So don't take it personally-I was just wondering if YOU are the one making the actual selection, or do you just want to start learning about them.

 

[TVP]

Producers of superalloys have a lot of information available regarding properties, applications, etc. Try the following links:

http://www.specialmetals.com/publication/by_category.htm

http://www.allvac.com/

http://www.kruppvdm.com/Info_Dienst_eng.html

http://www.haynesintl.com/

http://www.cartech.com/

click on Technical Information or Product Literature

 

[Fred]

Thanks TVP, I think I have now enough matter and my holydays will be deserved....

For Metalguy : don't be afraid, I don't take it personaly. You have understood that I am not familiar with superalloys but as our requirements are increasing in new applications, I need to come back to the basis . I only hope it won't take years having a big picture of these materials.

 

[JimMetalsCeramics]

If you are interested in these materials for their surface properties (e. g., corrosion and wear performance) you may need to look into other sources. What is your application? You might wind up selecting a material for reasons that are not addressed by some database, such as cost, ease of fabrication and availability of the material.

 

[Fred]

The availabality of these materials is indeed a big problem as we don't really interest the producers with our little quantities. It is one thing to select the best material, it is another thing to find it in the right dimensions with speaking of delivery time.

 

[JimMetalsCeramics]

If you want to coat out a superalloy onto something simpler (e. g., steel) you can do this quite reaily. Powders are very much available for thermal spraying compositions ranging from Stellite to Inconel. If you need a bulk solid of these materials, you will either have to find a starting plate or bar, or, if you can't find it, have the parts either spray formed or pressed and sintered from powder.