Research on cracking behavior of ultra-large 2024 aluminum alloy flat ingots
The size of high-strength aluminum alloy flat ingots increases as aerospace structural components become larger,thus the difficulty of ingot casting also increases.The influence of casting speed and wiper position on the temperature and stress fields of 500 mm×2 300 mm and 600 mm×2 500 mm 2024 aluminum alloy flat ingots was studied through numerical simulation of the casting process.The results indicate that casting speed has the greatest impact on the melt sump depth,and increasing casting speed can greatly reduce in-ternal stress.However,a substantial increase in the depth of the sump is not conductive to reducing the porosity and hot cracking of the ingot.Raising wiper position can effectively re-duce internal stress.This process can be optimized by reducing casting speed and raising wiper position.The industrial trial production with this technology can be used for preparing oversized 2024 aluminum alloy flat ingots.
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