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Influence of mold Preheating and Silicon Content on Microstructure and Casting Properties of Ductile Iron in permanent mold

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Journal of Iron and Steel Research(International) 2011年第3期18卷 34-39页

作者： Jafar Khalil-Allafi Behnam Amin-Ahmadi Faculty of Materials Engineering Sahand University of Technology Department of Materials Science and Engineering Sharif University of Technology

The effects of the mold preheating and the silicon content of ductile iron on the percentage of carbides,graphite nodule counts and shrinkage volume were *** results showed that the percentage of carbides and the shrinkage volume decreased when the mold preheating *** ductile iron with the carbon equivalent of 4.45 % and the silicon content of 2.5% without any porosity defects was achieved when the mold preheating was 450 ℃.Increasing the silicon content in the range of 2.1%-3.3% led to the increase in graphite nodule count and graphite size and the decrease in percentage of *** is due to the increase in induced expansion pressure during the graphite formation with the increasing of silicon *** suitable condition for casting a sound product of ductile iron without the riser at the mold preheating temperature of 300 ℃ is the silicon content of 3.3% and carbon equivalent of 4.7%.

关键词： ductile iron permanent mold preheating temperature carbide shrinkage volume silicon content

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Analysis of filling process of Ti6Al4V alloy melt poured in permanent mold during centrifugal casting process

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中国有色金属学会会刊：英文版 2001年第3期11卷 353-357页

作者：盛文斌李东杨锐刘羽寅郭景杰贾均中科院金属所辽宁沈阳 110016 哈尔滨工业大学黑龙江哈尔滨 150001

Ti6Al4V hip joint was foundered and the filling process of the melt poured in permanent mould during the centrifugal casting process was analyzed and the mathematical model of the filling process was established. Furthermore, the mathematical model was validated with a wax model experiment. Calculating results show that the centrifugal field has an important influence on the filling process and the melt fills the mould with variational cross sectional area and inclined angle. The cross sectional area is in inverse proportion to the filling speed and its decreasing speed becomes fast with increasing rotating speed. The tangential value of the melt cross sectional free surface inclined angle is in direct proportion to the filling speed and the inclined angle increases with the filling length. Change curves of the cross sectional inclined angle and area were obtained by the wax model experiment when the rotating speeds were 60, 90 and 120 r/min respectively, which shows that the mathematical model is consistent with the experimental results. [

关键词： flow status Ti6Al4V alloy cross sectional area permanent mold centrifugal casting

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Foundry technology and its applications of ductile iron castings produced by water-cooled copper alloy mold

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China Foundry 2004年第S1期1卷 38-43页

作者： X.B.Qi J.Tang Z.A.Liu D.X.Piao F.Q.Yin S.C.Yang Shenyang Research Institute of Foundry Shenyang 110022LiaoningP.R.China Dongfeng Chaoyang Diesel Engine Co.Ltd Chaoyang 112000LiaoningP.R.China

The high efficiency mechanized foundry technology of castings produced by using water-cooled copper alloy permanent mold has been systematically studied. Through the researching a Cu-Cr-Mg alloy with high conductivity and good combined mechanical properties used for making permanent mold was developed, and the basic design principles of the water-cooled permanent mold along with the control-range of relevant foundry processing parameters were also established. A cast production line equipped with water-cooled copper alloy mold was designed and fabricated for production of ductile iron automobile gear castings, This production line can consistently make automobile gear castJngs Jn QT500-15 and QT600-5 (Chinese Standard) grades of ductile iron with up to 95% casting success rate.

关键词： ductile iron automobile casting permanent mold

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