×
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

Titanium-Chromium embrittlement

Titanium-Chromium embrittlement

Titanium-Chromium embrittlement

(OP)
Hi all,

Does anybody know of any potential embrittlement issues of a chromium-titanium interface undergoing 2-3 hours heating at a temperature of about 450-550C? One of my colleagues mentioned offhand that he was told this can bring about a reduction in fatigue life of compressor blades undergoing HCF testing but hasn't provided me with any references, and my knowledge of materials is sketchy at best!

I've done a good few hours of online searches, and my access to proper articles or books is limited; I have had no luck in finding an answer.

Can anyone suggest any articles or books that have this information, or explain why such a reduction may occur?

Much appreciated,

Andy

 

RE: Titanium-Chromium embrittlement

Have you looked at a phase diagram and diffusion coef?
That is where I would start.
Look for references to the formation of Ti intermetallic compounds.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Titanium-Chromium embrittlement

Can you please explain the materials/coatings in a little more detail?  Are you saying that the compressor blade is fabricated from a titanium alloy and that there is some type of chromium-based coating on top of it?  Hard industrial chromium?  HVOF spray with chromium?  Something else? Environment?  Chemical species present?

RE: Titanium-Chromium embrittlement

(OP)
EdStainless - a-ha, the diffusion coefficient coupled with phase diagrams! I've started digging in those directions...

TVP - it is essentially a thin (~0.3-0.4 micron) Cr-interlayer on a Ti-alloy prior to the gradual phase-in of different metals through a PVD process. We've never experienced any problems with Ti-substrates before tto be honest but I'd like to cover all bases.

metengr - that link proved to be very useful. I think I'll have to have a good look at the patent sie of things to make sure I'm not crossing over anybody else's proven processes.

Many thanks for taking the time out to answer my post.

Andy

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