Effect of semi-continuous casting process on the structure of Al-1.3Fe-0.2Si aluminum alloy flat ingot
Al-1.3Fe-0.2Si aluminum alloy flat ingots have been prepared with the LHC Semi-continuous casting process and the microstructure of the ingots for mirror aluminum have been studied with different parameters.The results indicate that the second phases are mainly flaky or acicular β-Al(Fe,Mn,Si)phase and intermittent or spherical α-Al(Fe,Mn,Si)phase.The flaky or acicular β-Al(Fe,Mn,Si)phases are more refined first and less re-fined thereafter as cooling water increases.When the cooling water volume and casting speed are 162 m3/h and 55 mm/min,respectively,the second phase size of the ingot is the smal-lest and the surface of the finished sheet is bright without any patterns.The refining effect on grain size increases first and then decreases with the increase of cooling water volume.The best grain refinement effect is achieved when the cooling water volume is 150 m3/h and casting speed is 50 mm/min,but the surface of the finished sheet shows stripe defects.Considering that the second phase has a greater impact on rolling mirror aluminum sheets and that the rolling process has a crushing effect on the ingot grains,it is most beneficial to in-dustrial production setting cooling water volume and casting speed at 162 m3/h and 55 mm/min respectively.
Al-1.3Fe-0.2Si alloy semi-continuous casting processAl-Fe second phasemicrostructurestripe defects
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