铸造技术2013，Vol.34Issue(4)：393-396,4.
冷却速率对A357合金凝固组织的影响
Effect of Cooling Rates on Solidification Microstructure of A357 Alloy
摘要
Abstract
Two groups of A357 alloy specimens with the same heights and different diameters were cast m sand and steel moulds.The variation of SDAS (second dendrite arm spacing) from the wall to the center in the cross section was studied,and the effects of the cooling rates caused by different moulds and sample diameters on the microstructures were analyzed.The results show that,in both sand and steel mould samples,SDAS increases from the wall to the center,and also increases with the increase of the sample diameter.Compared to the steel mould samples,the sand model samples have a more significant impact on the microstructures.The relationship between SDAS λ2 and cooling rates v is determined to be λ2=38.76145v-0.27603.关键词
A357合金/凝固组织/冷却速率/二次枝晶间距Key words
A357 alloy/ solidification microstructure/ cooling rates/ SDAS分类
金属材料引用本文复制引用
王善娜,介万奇,高志明,刘永勤..冷却速率对A357合金凝固组织的影响[J].铸造技术,2013,34(4):393-396,4.基金项目
国家重点基础研究(973)资助项目(2011CB610403) （973）
