Can slow cooling achieve fully annealed grade 2 Ti foils?

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To achieve fully annealed grade 2 titanium (Ti) foils with a thickness of 0.0125mm, a two-step annealing process is recommended. Initially, the foils should be vacuum annealed at 700°C for 2 hours, followed by a secondary heat treatment at 550-575°C (1000-1100°F) for 15-30 minutes to relieve stress. The cooling process must be slow to prevent additional stress from forming in the material. Failure to implement these steps can result in decreased ductility and suboptimal material properties.

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spiri
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Hello, I'm having a hard time stamping and annealing grade 2 Ti foils (0.0125mm thickness). The ductility appears to decrease significantly after I vacuum anneal the Ti foil after stamping. I'm running them at a vacuum of 10-6, 700 deg C for 2 hrs and I seem to be making them worse than if I don't anneal them at all. I'm looking for a fully annealed part after stamping. Any ideas on how I can achieve this?
 
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It sounds like you are annealing, but not stress relieving. Any heating up can add stress to the material. 700C @ 2 hr, is correct for annealing, then cool, then heat to 550-575C (1000-1100F) for 15-30min, then re-cool. This will help relieve stress, you have to do similar processes in steel. Feel free to double check my math, our ovens are in F.
 
Are you allowing it to cool down slowly?
 

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