Help! How to discern between grade 2 and Ti6Al4V?
Help! How to discern between grade 2 and Ti6Al4V?
(OP)
I have a few lots of small parts that were meant to have been machined from grade 2 Ti. I have since learned that some amount of them are likely grade 5 (Ti6Al4V). They have already gone through part of the manufacturing process for 55 of them and they're too expensive to just throw out. Is there a simple, non-destructive (and clean, these are medical devices) method that can be used to determine if they are grade 2 or grade 5?
Any help would be greatly appreciated.
Any help would be greatly appreciated.





RE: Help! How to discern between grade 2 and Ti6Al4V?
RE: Help! How to discern between grade 2 and Ti6Al4V?
RE: Help! How to discern between grade 2 and Ti6Al4V?
RE: Help! How to discern between grade 2 and Ti6Al4V?
Also, I think alloyed Ti-6Al-4V [Gr5 ] is mildly magnetic, relative to commercially pure [CP, Gr2] titanium which is essentially non-magnetic.
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
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RE: Help! How to discern between grade 2 and Ti6Al4V?
Every good metallurgist carries a magnet!
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
RE: Help! How to discern between grade 2 and Ti6Al4V?
But electrical resistivity may be useful as the difference is about 2x between unalloyed and Ti and 6-4.
This should be enough to allow Eddy Current testing to sort them.
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P.E. Metallurgy, Plymouth Tube
RE: Help! How to discern between grade 2 and Ti6Al4V?
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
RE: Help! How to discern between grade 2 and Ti6Al4V?
The problem is, I have a crimp feature in my part. I received a batch of parts in the past where the tabs were breaking off when crimped and when I inquired with the shop, they confirmed that their material supplier shipped them grade 5 instead of grade 2. I now am seeing cracks again and assumed the same problem, but the XRF is telling me that all of the parts I received in this recent shipment are grade 2. I'm concerned because they're cracking when they shouldn't be.
So do I believe the XRF and commence to addressing the cracking of grade 2?
RE: Help! How to discern between grade 2 and Ti6Al4V?
RE: Help! How to discern between grade 2 and Ti6Al4V?
Just because it is Gr2 does not mean that it has good ductility.
The CP grades have a wide range of composition (oxygen) and properties.
And Ti properties can very a lot based on processing.
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P.E. Metallurgy, Plymouth Tube
RE: Help! How to discern between grade 2 and Ti6Al4V?
PMI is good at seeing large, discrete chunks of alloy such as are found in Ti6Al4V. Something else is going on.
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
RE: Help! How to discern between grade 2 and Ti6Al4V?
Do you see the original mill MTRs?
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P.E. Metallurgy, Plymouth Tube
RE: Help! How to discern between grade 2 and Ti6Al4V?
RE: Help! How to discern between grade 2 and Ti6Al4V?
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P.E. Metallurgy, Plymouth Tube
RE: Help! How to discern between grade 2 and Ti6Al4V?
Suggest your company seriously reconsider sourcing such a sensitive material from offshore. Take the time to read all of this http://www.eng-tips.com/viewthread.cfm?qid=172967
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
RE: Help! How to discern between grade 2 and Ti6Al4V?
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.