不同冷却速率对A356.2合金组织形貌的影响  

Influence of Different Cooling Rate on Microstructure Morphology of A356.2 Alloy

作　　者：白帮伟 阿拉腾 吴群虎 谢理明 

机构地区：[1]中信戴卡股份有限公司,河北秦皇岛066011

出　　处：《铸造》2014年第11期1158-1160,共3页Foundry

摘　　要：研究了不同冷却速率对A356.2合金组织形貌的影响。采用直径为10 mm的石墨模具和铜模具浇注A356.2合金,测得冷却速率分别为5.2℃/s,113.7℃/s。研究结果表明,与石墨模具浇注相比,铜模具浇注的合金二次枝晶间距仅为8%μm左右,共晶Si颗粒更加细小,分布更加均匀,可以应用于铸造生产,解决热节处缩松及晶粒粗大问题。The influence of different cooling rate on microstructure morphology ofA356.2 alloy was studied.Cooling rate of ingots pouring by graphite mould and copper mould are 5.2 ℃/s and 113.7 ℃/s.The results show that secondary dendrite spacing ofα-A1 in copper casting alloy is about 8 μm,eutectic Si particles is smaller and more evenly distributed,the hot spot dispersed shrinkage and grain coarsening were solved,the process was applied to foundry site.

关 键 词：冷却速率 A356.2合金 组织 

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]