涂装工艺对A356合金轮毂性能和组织的影响

Research of painting technology for properties and structures of A356 alloy wheel

研究了三级涂装工艺对T6处理和双级时效工艺下的低压铸造A356合金轮毂力学性能和组织的影响。研究表明:三级涂装工艺使T6状态下合金的抗拉强度增加15 N/mm2,双级时效工艺条件下A356合金抗拉强度增加了5 N/mm2,屈服强度增加了15 N/mm2,对合金伸长率基本没有影响。电导率和DSC分析表明,三级涂装工艺不同程度地改变了合金中强化相和平衡相的分布数量和密度,引起了合金力学性能的变化。该研究对进一步优化A356合金轮毂T6处理工艺和双级时效工艺具有一定的意义。

The effects of painting technology, on mechanical properties and structures of low pressure die casting of A356 alloy wheel with T6 and double aging heat-treatment were studied, h was found that, the three class painting technology could make the tensile strength increased by 17 N/mm^2 after T6 heat treatment, and also eould make the tensile strength increased by 5 N/mm^2 and yield strength increased by 21 N/mm^2 after double aging heat-treatment, while elongation was not influenced by three class painting techn- ology. Electrical conductivity and DSC test showed that three class painting technology changed the mechanical properties by changing the population and density of strong-phase β＂ ,β＇and balance phase β in different extent .The study has some good meaning for optimizing the technology of T6 and double aging.