Incoloy 800

[johngerhart]

Looking for assistnace with incoloy 800 failures modes in heat exchnagers form 500-1000 F , potentially cyclical operation . Some suggestions are carburizing , embrtiilement ?
thank you

 

[EdStainless]

Do you have data on the environment?
Do you have any metallography on samples?
I have see 800 fail by thermal fatigue, chloride stress corrosion cracking, IGA and a few other modes.

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Plymouth Tube

 

[metengr]

Here is a tip, get the failed tube to a metallurgical lab for failure analysis. This is the only way to determine the cause of failure.

 

[johngerhart]

thanks for the replies , but really looking more for literature references on what might be occurring 850-1000 F materials are britlle with evidence of cracking
anyone know who is competent at repairing ?
Thanks

 

[metengr]

You can visit this web site for background information on damage mechanisms for Ni-base alloys;

http://www.specialmetals.com/index.php

Repairs? You are looking at probably plugging failed tubes and eventually re-tubing this heat exchanger. Repair Organization? Depending on your locations, you can start out with a qualified boiler repair organization and/or the OEM of the heat exchanger.