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针对工业生产中高锰锌3系铝合金铸轧板组织中出现的中心层偏析缺陷,通过金相显微镜、扫描电子显微镜和能谱分析仪等分析手段对其进行研究,探讨其形成机理,并试图通过工艺优化改善其中心层偏析情况。结果表明:高锰锌3系铝合金铸轧板存在较为严重的中心层偏析,主要原因是铸轧时,富集合金元素的铝液沿枝晶间隙被推到中心区域,凝固结晶成复杂相。高锰锌3系铝合金合金化程度较高,结晶区间大的特性也加剧了中心层偏析的程度。通过控制合适的铸轧速度、浇铸温度、冷却强度、铸嘴结构等工艺条件,能够使中心层偏析得到改善。
Aiming at the defects of central layer segregation in the structure of high manganese zinc-3 series aluminum alloy cast-rolled plate in industrial production, the mechanism of its formation is studied by means of metallographic microscope, scanning electron microscope and energy spectrum analyzer, Improve the center layer segregation through process optimization. The results show that there is a serious center layer segregation in the cast-rolled plate of high manganese zinc-3 series aluminum alloy. The main reason is that the molten aluminum enriched alloying elements is pushed into the central region along the dendrite gap during casting and solidification to form a complex phase . The high manganese-zinc-3-series aluminum alloy has a high degree of alloying and the large crystallization range also aggravates the degree of segregation at the center layer. By controlling the appropriate casting speed, casting temperature, cooling strength, nozzle structure and other process conditions, can make the center layer segregation improved.