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Low Yield Strength in Titanium 6-4

Low Yield Strength in Titanium 6-4

Low Yield Strength in Titanium 6-4

(OP)
We have some 6-4 Ti parts that were forged and heat treated in a single lot.  However, subsequent mechanical testing on them revealed that some parts had depressed Yield strength while maintaining the same Ultimate strength and ductility as the other parts with higher yield strength.  What could cause depression in yield strength?

RE: Low Yield Strength in Titanium 6-4

chemical composition variation and/or segregation

property anisotropy after forming (crystallographic orientation)

temperature variation during any of the processing steps

Regards,

Cory

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RE: Low Yield Strength in Titanium 6-4

(OP)
Cory,

Thank you for your suggestions.  Could not respond sooner as I was out of office.

Thank you!

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