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

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 

机构地区：[1]School of Materials Science and Engineering,Beijing Institute of Technology,Beijing,China [2]Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing,China [3]School of Mechanical Engineering,Beijing Institute of Technology,Beijing,China [4]CITIC Dicastal Co.,Ltd.,Qinhuangdao,Hebei Province,China

出　　处：《Materials Genome Engineering Advances》2024年第3期117-129,共13页材料基因工程前沿（英文）

基　　金：supported by the National Natural Science Foundation of China(grant number 52073030);the National Natural Science Foundation of China-Guangxi Joint Fund(U20A20276).

摘　　要：Al-Si alloys are widely used in automotive casting components while microporosity has always been a detrimental defect that leads to property degradation.In 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 concentration.By 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 g.It 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 stable.In addition,the linear regression between secondary dendrite arm spacing and the equivalent pore diameter has been studied for the first time,matching well with experiments.This 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 

分 类 号：TG14[一般工业技术—材料科学与工程]