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Aluminum cast alloy A203

Aluminum cast alloy A203

Aluminum cast alloy A203

(OP)
Folks,
Do you have any problems (cracking issues) with A203 aluminum alloy after heat treatment? I try different cooling cycles but either is cracking (hot water), or does not meet the mech. properties (air). Also I have recommendation to use Helium or Argon (too expensive, but it works). Any other suggestions?
I appreciate any feedback.
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