Comparison of mechanical properties and microstructure of AZ91D alloy motorcycle wheels formed by die casting and double control forming
Comparison of mechanical properties and microstructure of AZ91D alloy motorcycle wheels formed by die casting and double control forming
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压铸与双控成形AZ91D合金摩托车车轮力学性能及显微组织比较
DOI：
10.1016/j.matdes.2012.04.029
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发表时间：
2012-09
期刊：
影响因子：
--
通讯作者：
Luo, Shoujing
中科院分区：
文献类型：
--
作者：
Jiang, Jufu;Wang, Ying;Chen, Gang;Liu, Jun;Li, Yuanfa;Luo, Shoujing
首次开发了摩托车车轮双控成形技术，用于成形具有较高机械性能的复杂零件。对双控成形和压铸成形的AZ91D镁合金车轮的力学性能和显微组织进行了比较。数值模拟结果表明，轮肋的速度值比其他位置的速度值小。压力和温度从轮毂到溢流洗衣机都在下降。较大的表面缺陷浓度表明，氧化物和陷阱主要存在于设计良好的溢流发射器中。试验结果表明，摩托车车轮在注塑过程中采用高速充填可以获得形状复杂的零件，锻造压力使零件的力学性能有了较大的提高。显微组织分析表明，锻造系统产生的高压使初生相α-Mg明显细化，共晶组织由α-Mg和β-17Al12组成的共晶分布均匀。与压铸件相比，双控成形的零件组织细小均匀，无缺陷，具有较高的力学性能，极限抗拉强度为246 MPa，延伸率为9.5%，维氏硬度为87.9。
A double control forming technology of motorcycle wheel was firstly developed to form the complex parts with high mechanical properties. The mechanical properties and microstructure of the AZ91D magnesium alloy motorcycle wheels formed by double control forming and die casting was compared. The results of numerical simulation showed that the velocity magnitude in wheel rib was small than that in other positions. The pressure and temperature decreased from the wheel hub to the overflow launders. Large surface defect concentration indicated the oxides and entrapments existed mainly in the well-designed overflow launders. The experimental results confirmed that the motorcycle wheel’s complex shape can be achieved by the high-speed filling in the injection procedure and the mechanical properties of the parts were greatly improved due to the forging pressure. It is clear from the micrographs that the high pressure caused by forging system results in obvious grain refinement of the primary α-Mg and uniform distribution of the eutectic consisting of the eutectic α-Mg and β-Mg17Al12. Higher mechanical properties including ultimate tensile strength of 246MPa, elongation of 9.5% and Vicker-hardness of 87.9 were obtained in the parts formed by double control forming due to the fine and uniform microstructure without defects in comparison to die casting.
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