×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Incoloy 909 help.

Incoloy 909 help.

Incoloy 909 help.

(OP)
I have a couple of questions regarding Incoloy 909. This is the first time I have worked with this specific alloy. I am planning on annealing it in a hydrogen atmosphere. Is this material subject to hydrogen embrittlement? Also what acid ratio should I pickle it in? I know this is an uncommon alloy but I hope someone can help. Thank you.  

RE: Incoloy 909 help.

My suggestion is to visit the web site below and contact Special Metals directly. I have dealt with them in the past and they know Ni-base alloys better than anyone

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

RE: Incoloy 909 help.

Quote:

Is this material subject to hydrogen embrittlement?

No (see page 5 of the technical bulletin).

RE: Incoloy 909 help.

Inco 909 has a very low,(less than half) of conventional superalloys Coefficient of Thermal Expansion (CTE).  The material is often used in high temperature jet engine applications.  Because it has no Chromium, it has poor general surface oxidation resistance as well as suffers from a condition known as Stress Assisted Grain Boundary Oxidation which can lead to transverse stress notch rupture sensitivity.  The onset of this is just above 900F. This material also exhibits a drop-off in mechanical properties at 1200F due to instability of Gamma Prime.  This material is weldable to itself and to other superalloys.  Usage at or above 1000F typically requires coating with NiCrAlY alone or in conjunction with YZr topcoat. Heat treatments are specialized as is coating so seek professional advise as metengr suggested. One good thing is that there is quite a bit published on the characteristics of this material and it's earlier versions 903 and 907.
 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources