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solution treat for aluminium below minimum temp by 1.5C

solution treat for aluminium below minimum temp by 1.5C

(OP)
i have an aluminum alloy 1xxx which had a set temperature of 529 +/-4C Solution treat however the load had a temperature of only 523. can i do another solution treatment to reset or do i have to age and then run the whole cycle again i.e. solution treat followed by age?

would this have an effect on properties?

RE: solution treat for aluminium below minimum temp by 1.5C

(OP)
it is an aluminium alloy sorry not a 1xxx.

RE: solution treat for aluminium below minimum temp by 1.5C

What alloy? You have a nonconformance, with two dispositions; either repeat the re-solution anneal within the specified temperature range or continue with the aging treatment and determine if the mechanical properties are acceptable.

RE: solution treat for aluminium below minimum temp by 1.5C

I would agree with metengr. The process was apparently non-conforming and thus requires some corrective action.

There was no mention of what process spec (if any) was used for this HT procedure. I checked an old copy of MIL-H-6088 and the only wrought materials with a solution HT temp in the range noted were 6951 sheet and 2618 forgings. Section 6.3.3.4 of MIL-H-6088 talks about potential issues when the solution heat treat temp is below the minimum specified. Section 3.6.2 covers re-solution heat treatment, including limits on the number of times re-solution heat treatment is permitted.

Hope that helps.
Terry

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