低温熔体获得方式对熔体温度处理效果的影响

Effect of Different Ways to Get Low Temperature Melt on Thermal Treatment

利用熔体温度处理工艺研究了A3 5 6铝合金低温熔体的不同获得方式对其凝固组织的影响 ,用直接炉内保温和机械搅拌 2种方式改变低温熔体的结构 ,以获得理想的凝固组织。实验结果表明 ,熔体温度处理过程中 ,对低温熔体机械搅拌可以明显改善混合后熔体的组织形貌 ,使组织形貌由树枝晶转变为等轴晶 ;在搅拌基础上选取较低的低温熔体温度 ,能够得到很好的凝固组织。

In this paper, melt thermal treatment (MTT) process is used to refine the hypoeutectic Al Si alloy. The effect of different ways to get low temperature melt (LTM) on the final solidification structure is studied. Heat preservation at different temperature and stirring are considered to be two different ways to get LTM. The results showed that through stirring, the morphology of solidification structure be changed effectively from dendrites to equixed grains. By using a lower temperature LTM, the solidification structure is refined greatly.