新型晶粒细化剂在A356汽车轮毂铝合金中的应用研究  

Application of Novel Grain Refiner in Refinement of A356 Alloy for Wheel Hub

作　　者：姚利军[1] 张海军 王悦博 张亦杰[3] 

机构地区：[1]内蒙古交通职业技术学院,内蒙古赤峰024005 [2]天津航天机电设备研究所,天津300301 [3]上海交通大学材料科学与工程学院,上海200240

出　　处：《铸造技术》2017年第2期360-363,共4页Foundry Technology

基　　金：上海市科委国际合作基金资助项目(14140711000)

摘　　要：铝合金轮毂在铸造成型过程中由于受其形状及模具成型工艺的制约,致使其在不同部位的微观组织、力学性能具有很大程度的差异。有效的晶粒细化可以同时提高强度和伸长率,并减少铸造凝固过程的缺陷。基于对晶粒细化机理的理解,开发出新型铝合金晶粒细化剂用于A356铝合金的晶粒细化。实验结果表明,与Al5Ti1B细化剂相比,新型晶粒细化剂可以更为有效的细化A356合金,使其晶粒尺寸由600μm下降至300μm。经T6处理后,有效细化后A356合金的强度比Al5Ti1B细化的合金提高了13%,伸长率提高了23%。The microstructure, mechanical properties of Al-alloy wheel hub have a large difference in different parts due to its shape and mold forming process constraints. The effective grain refinement can eliminate the difference, improve the mechanical properties and elongation simultaneously, and reduce the casting defects. Based on the understanding of grain refinement mechanism, the novel grain refiner was developed and applied for the refinement of A356 alloy. Experimental results show that the novel refiner can decrease the grain size efficiency compared with the commercial Al5Ti1 B refiner,the grain size of A356 decreasing from 600 μm to 300 μm in diameter. After heat treatment of T6, the ultimate tensile strength and elongation are increased by 13% and 23%, respectively.

关 键 词：A356 晶粒细化 力学性能 轮毂 

分 类 号：TG292[金属学及工艺—铸造]