浇注温度对A380铸造铝合金显微组织中含Fe相的影响  

Effect of Pouring Temperature on Fe-Containing Phase in Microstructure of A380 Cast Aluminum Alloy

作　　者：孔建 王金涛 于文强[2] KONG Jian;WANG Jintao;YU Wenqiang(Yantai Engineering&Technology Co llege,Yantai 264006,China;School of Mechanical Engineering,Shandong University of Technology,Zibo 255000,China)

机构地区：[1]烟台工程职业技术学院,山东烟台264006 [2]山东理工大学机械工程学院,山东淄博255000

出　　处：《热加工工艺》2023年第11期150-153,共4页Hot Working Technology

基　　金：山东省科技厅重点研发项目(2019GGX101037)。

摘　　要：A380铸造铝合金因其优异的耐磨性和耐腐蚀性、低热膨胀系数和高强度质量比而被广泛应用于汽车的缸体、缸盖和活塞等零件上。浇注温度是A380合金获得优异力学性能的重要工艺参数。本文在700~900℃的不同浇注温度下研究了A380铸造铝合金(Fe=1.1wt%)显微组织中含Fe中间相的演化过程。结果表明,当浇注温度高于800℃时,合金中有害β-Fe相的析出几乎得到了抑制。当浇注温度为700~900℃时,随着浇注温度的升高A380合金的二次枝晶臂间距逐渐减小,硬度值总体呈增加趋势,这与金相组织中α-Fe相与β-Fe相的含量与比例相对应。The A380 cast aluminum alloy is widely used in the cylinder block,cylinder head and piston of automobile due to its excellent wear resistance and corrosion resistance,low thermal expansion coefficient and high strength-to-mass ratio.The pouring temperature is an important process parameter for A380 alloy to obtain excellent mechanical properties.The evolution of Fe-containing phase in the microstructure of A380 aluminum alloy(Fe=1.1wt%)was studied at different pouring temperatures of 700-900℃.The results show that the precipitation of the harmful β-Fe phase in the alloy is almost suppressed when the pouring temperature is above 800℃.With the increase of pouring temperature,the secondary dendrite arm spacing of the A380 alloy gradually decreases when the pouring temperature is ranging from 700℃ to 900℃,the hardness of A380 alloy is generally increased,which corresponds to the content and proportion ofα-Fe phase andβ-Fe phase in the microstructure.

关 键 词：A380铝合金 浇注温度 显微组织 二次枝晶臂间距(SDAS) 硬度 

分 类 号：TG292[金属学及工艺—铸造]