工艺条件对消失模铸造ZL101铝合金组织与性能影响
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摘要
采用不同填充砂和直浇道类型的消失模工艺铸造ZL101合金试样,分析比较其组织与性能。结果表明,填充铁丸比填充宝珠砂的消失模铸造ZL101合金针孔少、组织细小,铸态与T6热处理后的抗拉强度提高10%以上;用空心纸管代替EPS泡沫做直浇道,可以减少铸件针孔,改善合金组织,从而提高铝合金铸件的力学性能。
The ZL101 castings were produced by using LFC process with different supporting sand and sprue,and microstructure and mechanical properties of LFC ZL101 castings were analyzed comparatively.The results show that the microstructure of ZL101 castings produced by LFC process with steel shot filling is finer with less pin-hole,and a tensile strength at as-cast and T6-treated is 10% higher than those of ones with ceramcore sand filling.Using paper hollow sprue instead of foam sprue is beneficial in reducing pinhole,improving the microstructure and mechanical properties of aluminum alloy castings.
The ZL101 castings were produced by using LFC process with different supporting sand and sprue,and microstructure and mechanical properties of LFC ZL101 castings were analyzed comparatively.The results show that the microstructure of ZL101 castings produced by LFC process with steel shot filling is finer with less pin-hole,and a tensile strength at as-cast and T6-treated is 10% higher than those of ones with ceramcore sand filling.Using paper hollow sprue instead of foam sprue is beneficial in reducing pinhole,improving the microstructure and mechanical properties of aluminum alloy castings.
引文
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[9]熊小青.型砂激冷能力对铝合金消失模铸件组织性能的影响[J].铸造技术,2007,28(7):958-960.
[10] FANG Q T,GRANGER D A.Porosity formation in modified and unmodified A356alloy casting[J].AFS Transactions,1991(99):83-90.
[11] SUN Y,TSAI H L.Investigation of wetting and wicking properties of refractory coating in the EPC process[J].AFS Transactions,1992(100):297-308.
[2]樊自田.先进材料成形技术与理论[M].北京:化学工业出版社,2006.
[3]樊自田,蒋文明,赵忠.铝(镁)合金消失模铸造近净成形技术研究进展[J].中国材料进展,2011,30(7):38-47.
[4]MLLER H,GOVENDER G,STUMPF W E.Application of shortened heat treatment cycles on A356automotive brake calipers with respective globular and dendritic microstructures[J].Transactions of Nonferrous Metals Society of China,2010,20(9):1 780-1 785.
[5]魏尊杰,吴维冈,陈琼,等.干砂消失模铸造铝合金充型能力的理论分析及涂料性能对其影响的研究[J].铸造,1992(9):1-7.
[6] TSENG C H.Thermal and chemical analysis of the foam,refractory coating and sand in the EPC process[J].AFS Transactions,1992(100):509-518.
[7] CONLEY J G,HUANG J,ASADA J,et al.Modeling the effects of cooling rate,hydrogen content,grain refiner and modifier on microporosity formation in Al A356alloys[J].Materials Science&Engineering,2000,A285(1-2):49-55.
[8]蒋文明,樊自田,刘德均.真空低压消失模壳型铸造和消失模铸造铝合金组织和性能对比[J].中国有色金属学报,2013,23(1):22-28.
[9]熊小青.型砂激冷能力对铝合金消失模铸件组织性能的影响[J].铸造技术,2007,28(7):958-960.
[10] FANG Q T,GRANGER D A.Porosity formation in modified and unmodified A356alloy casting[J].AFS Transactions,1991(99):83-90.
[11] SUN Y,TSAI H L.Investigation of wetting and wicking properties of refractory coating in the EPC process[J].AFS Transactions,1992(100):297-308.