MIL-H-81200 for the stress relief of Titanium indicates 900° to 1200° F for 60 to 240 minutes. It also talks about various furnace atmospheres including vacuum, inert gas and others. It does not give specific requirements for the stress relief atmosphere. I've seen references to scaling occurring above 1000°F. Can I do a 900°F stress relief in an air atmosphere, or does this need a protective atmosphere? This is a welded structure from .080 thick sheet metal for a low pressure duct on a commercial aircraft.
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