Characterization and Prediction of Microporosity Defect in Sand Cast WE54 Alloy Castings

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	Characterization and Prediction of Microporosity Defect in Sand Cast WE54 Alloy Castings
	J. Li; R. Chen; Y. Ma; W. Ke
	2014
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	30 期号:10 页码:991-997
摘要	In order to study the effect of Zr modification and riser size on microporosity defect distributions in WE54 alloy sand castings, the microporosity volume percentage in Zr-free and Zr-containing WE54 alloy plate castings was determined by density measurement based on Archimedes' principle, and the microstructure of the microporosity defects was observed by optical microscopy and scanning electron microscopy. Then by using Procast software, the Niyama criterion was calculated in order to investigate the validity of Niyama criterion on prediction of microporosity defects in WE54 alloy sand castings. It is found from the density measurement results that Zr addition does not affect the microporosity distributions in WE54 alloy castings. While the distribution area of microporosity defect in the plate castings decreases significantly as the riser size increases. Based on the experimental results, a riser selection principle for production of compact WE54 alloy castings is proposed that the solidification modulus of the riser should be greater than that of the casting by 30%, simply m(r) >= 1.3m(c). By comparing the experimental and simulating results, it is found that the predicted microporosity regions by Niyama criterion agrees well with experimental results, and a critical Niyama value of 0.4 degrees C-0.5 s(0.5) mm(-1) is suggested for prediction of microporosity formation in WE54 alloy sand castings.
部门归属	[li, jilin ; chen, rongshi ; ma, yuequn ; ke, wei] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. ; chen, r (reprint author), chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. ; rschen@imr.ac.cn
关键词	Microporosity Defect We54 Alloy Sand Cast Niyama Criterion Shrinkage Porosity Niyama Criterion Design
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73266
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. Li,R. Chen,Y. Ma,et al. Characterization and Prediction of Microporosity Defect in Sand Cast WE54 Alloy Castings[J]. Journal of Materials Science & Technology,2014,30(10):991-997.
APA	J. Li,R. Chen,Y. Ma,&W. Ke.(2014).Characterization and Prediction of Microporosity Defect in Sand Cast WE54 Alloy Castings.Journal of Materials Science & Technology,30(10),991-997.
MLA	J. Li,et al."Characterization and Prediction of Microporosity Defect in Sand Cast WE54 Alloy Castings".Journal of Materials Science & Technology 30.10(2014):991-997.