冷却速度对ZL114A合金二次枝晶臂间距的影响  

Effect of Cooling Rate on Secondary Dendrite Arm Spacing of ZL114A Alloy

作　　者：何娟[1] 邹勇志[1] 黄文貌[1] 李卫超[1] 曾建民[1] 

机构地区：[1]广西大学有色金属及材料加工新技术教育部重点实验室,广西南宁530004

出　　处：《铸造技术》2008年第9期1214-1216,共3页Foundry Technology

摘　　要：利用金相显微镜及自动图像分析仪,测定ZL114A合金在同一凝固条件下、铸件不同壁厚部位的二次枝晶臂间距(SDAS),研究ZL114A合金凝固期热参数与SDAS的关系。结果表明,随着铸件壁厚的增加,冷却速度减小,局部凝固时间增长,二次枝晶臂粗化,SDAS增大;在呋喃自硬树脂砂型铸造条件下,SDAS与冷却速度及局部凝固时间之间的关系为SDAS=20.8tf0.3,SDAS=69.34v-0.3。The relationship between solidification parameters and the secondary dendrite arm spacing （SDAS） of ZL114A alloy was studied by measuring the SDAS in different sections by means of metallographic microscope and automatic image analyzer. The results show that the cooling rate decreases with the increase in the thickness of specimens, meanwhile the local solidification time increases, and secondary dendrite arm is coarsened, thus resulting in SDAS increase. A relationship of SDAS and cooling rate and local solidification time of casting under the condition of furan resin self-hardening sand mould casting is established： SDAS=20.8t1^0.3,SDAS=69.34v^-0.3.

关 键 词：ZL114A合金 二次枝晶臂间距 冷却速度 局部凝固时间 

分 类 号：TG136.1[一般工业技术—材料科学与工程]