Abstract
The mechanism of forming defects in 2024, 7075 series aluminium alloy forgings has been studied by means of metallography, EDAX, SEM etc. The defects are divided into two types by their appearance: needle-shaped and flake-shaped. The mechanism of them forming is discussed. It has been testified that the defects result from hydrogen or oxide film. The defects can be prevented by controlling the hydrogen content in the melt and keeping oxide film from involving.
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И Н Фридляндер. Deforming structural aluminium alloy (in Chinese). Yao Zhongyi etc tr. Chongqin: Scientific Technology Document Publishing House chong qin Sub-Publishing House. 1989. 34
Zhou Jin, Chang Xin, Guo Kexin. Residual porosity and crystalline step in aluminium alloy forgings. Acta Metallurgica Sinica (in Chinese). 1978, 14(3):246
Northwest University of Technology Non-ferrous Metal Compiler Group. Non-ferrous metal forging (in Chinese). Beijing: National Defence Industry Press. 1979. 98
Bryant A J. Identification of oxide defects in high-strength aluminium alloy plate. Journal of the Institute of Metals, 1963–64, 92(9):253–254
Dong Changqin, Zhuang Shuyan. Study on the relationship between hydrogen content and oxide film in aluminium alloy melt. Shanghai Metal (Non-ferrous Sub-volume), 1981, 6:34–41
Hamid Shahani. Effect of hydrogen on the shrinkage porosity of aluminium copper and aluminium silicon alloys. Scand J Metallurgy, 1985, 14:306–312
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Project supported by the National Nonferrous Metals Industry Corporation of China
Synopsis of the first author Zhang Shenghua, professor, born in 1942. Major research areas are conform process of aluminium, clad materials and physical base of plastic forming.
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Zhang, S., Zhu, X., Lin, G. et al. Study on the formation of defects in duralumin forgings. J Cent. South Univ. Technol. 4, 16–19 (1997). https://doi.org/10.1007/s11771-997-0022-3
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DOI: https://doi.org/10.1007/s11771-997-0022-3