影响铝合金铸件显微疏松的因素  

The Factors Influencing Microporosity of Aluminum Castings

作　　者：麻向军[1] 金胜灿[2] 佟国栋[2] 侯骏[2] 赵立信[2] 苏俊义[1] 

机构地区：[1]西安交通大学,陕西西安710049 [2]中国第一汽车集团公司,吉林长春130011

出　　处：《铸造》2002年第7期403-407,共5页Foundry

摘　　要：从铝合金铸件显微疏松的形成机理出发 ,综述了熔体洁净度、熔体处理、合金成分及凝固条件对铝合金显微疏松的影响。氢含量对显微疏松具有决定性的作用 ,并且氢与夹杂及Sr存在交互作用 ,使疏松倾向增大。增大冷却速度和提高温度梯度可以减小显微疏松。指出Based on forming mechanism of micro porosity in aluminum castings, the effects of melt cleanness, melt treatment, alloy composition and solidification condition on micro porosity are discussed in this paper. Among the many factors, hydrogen content is a key factor, and the micro porosity is increased by the interaction of hydrogen with inclusions and Sr. Micro porosity can be decreased with increasing the cooling velocity and temperature gradient. It is pointed out that the research on reliable criterion function for porosity prediction of aluminum castings should be given more attention.

关 键 词：铝合金铸件 显微疏松 熔体洁净度 熔体处理 合金成分 凝固条件 

分 类 号：TG292[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]