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AMS 4919 Forming Cracks

AMS 4919 Forming Cracks

AMS 4919 Forming Cracks

(OP)
I'm currently working on my first real failure investigation on some AMS 4919 (Ti 6242) formed parts. The parts in question have a material thickness of .034", and are formed in annealled condition. Parts at the time of forming are without alpha case contamination, However, we are seeing a high rate of failure during forming on the bend radius. I feel that these fractures are occuring due to surface defects (pits, scratches) in the bend radius. I am going to further investigate this problem, however I would like your opinions to whether this would be a valid hypothesis. Also, beyond verifing that there is no alphacase/surface contamination and observing the fracture surface, what other methods of analysis would you recommend.

Callie
Lab Manager

RE: AMS 4919 Forming Cracks

"Annealing" is an extremely vague term when describing the thermal treatments of alpha-beta titanium alloys like Ti-6242.  I would confirm the exact time and temperature profile used, and whether or not the microstructure corresponds to such a treatment.  What are the details of the bending process?  Could be as simple as the strain induced during bending exceeds the normal workability limits of this grade?

RE: AMS 4919 Forming Cracks

(OP)
The anneal consists of 1650F+-25 for 30 min Vac Argon Quench. The forming particulars I'm not all that sure on. The problem in the past has been midigated by acid pickle and/or polish and heat. However, without a valid idea why the cracks are taking place, I cannot define the more appropriate procedure.

Callie

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