I have the dubious honor of trying to assess the impact to several of our technical standards which turned into pandora's box. Turns out we have three vendors annealing using three different sets of parameters. As we are generally satisfied with the product(s) I see no reason to upset the apple cart so in reality I'm just trying wrap my head around the potential differences. While the temperature varies somewhat between the procedures they all fall within the parameters for AMS 4931 (1300-1400 deg F); the difference that may be the most important is that there are three different cooling methods (note: AMS 4931 specifies in air). (1) is in air, (2) is using nitrogen under positive pressure and (3) is in vacuum. I imagine you could claim (1) and (2) are equivalent lacking additional information but (3) is a definitive outlier. Should there be a difference expected?
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