Journal
MATERIALS TECHNOLOGY
Volume 38, Issue 1, Pages -Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10667857.2023.2165245
Keywords
Al-Cu alloy; cylinder head; MAGMA simulation; process optimisation
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This paper proposes a casting improvement process to achieve the required quality of Al-Cu alloy cylinder heads. Hot tearing defects in the fire-face of the cylinder head were simulated using MAGMA software. The simulation results indicate that the large wall thickness transition difference in the fire face leads to a significant temperature and stress gradient during solidification. Two optimization options were explored to reduce the stress and cracking probability in the fire face.
This paper proposes a casting improvement process to enable the casting of Al-Cu alloy cylinder heads to achieve the required quality. The hot tearing defects generated in the fire face of the cylinder head during casting were simulated using MAGMA software. The simulation results show that the large wall thickness transition difference in the fire face of the cylinder head is the reason for the large temperature and stress gradient during solidification. Therefore, the first solution was optimised by forming the fire face as a whole into a flat plate, but the fire face centre area stress is still too high. The second optimisation option optimises the cold iron structure of the fire face, the probability of cracking in the fire face is reduced to 17%. These results have important reference significance for the optimisation of the Al-Cu alloy cylinder head hot tearing problem.
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