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Predicting the effect of cooling rates and initial hydrogen concentrations on porosity formation in Al-Si castings

Materials Genome Engineering Advances 2024年第3期2卷 117-129页

作者： qinghuai hou Junsheng Wang Yisheng Miao Xingxing Li Xuelong Wu Zhongyao Li Guangyuan Tian Decai Kong Xiaoying Ma Haibo Qiao Wenbo Wang Yuling Lang School of Materials Science and Engineering Beijing Institute of TechnologyBeijingChina Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijingChina School of Mechanical Engineering Beijing Institute of TechnologyBeijingChina CITIC Dicastal Co. Ltd.QinhuangdaoHebei ProvinceChina

Al-Si alloys are widely used in automotive casting components while microporosity has always been a detrimental defect that leads to property *** this study,a coupled three-dimensional cellular automata(CA)model has been used to predict the hydrogen porosity as functions of cooling rate and initial hydrogen *** quantifying the pore characteristics,it has been found that the average equivalent pore diameter decreases from 40.43 to 23.98μm and the pore number density increases from 10.3 to 26.6 mm^(−3)as the cooling rate changes from 2.6 to 19.4℃/s at the initial hydrogen concentration of 0.25 mL/100 *** is also notable that the pore size increases as the initial hydrogen concentration changes from 0.15 to 0.25 mL/100 g while the pore number remains *** addition,the linear regression between secondary dendrite arm spacing and the equivalent pore diameter has been studied for the first time,matching well with *** work exhibits the application of CA model in future process optimization and robust condition design for advanced automotive parts made of Al-Si alloys.

关键词： Al-Si alloy cellular automata cooling rate microporosity secondary dendrite arm spacing solidification

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