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采用光学显微镜及图像分析仪,研究了AlSi7Mg合金低过热度半连续铸造坯料在不同加热温度及保温时间下重熔的微观形貌及尺寸特征,结合差热分析的方法研究了加热过程中组织演变及晶粒长大过程。结果表明,重熔加热温度及保温时间共同影响着合金重熔组织的演变进程,随着加热温度升高及保温时间延长,晶粒逐渐球化并长大。加热温度越高,组织演变速度越快;保温时间越长,晶粒球化并长大越明显。有效控制AlSi7Mg合金重熔加热温度及保温时间,能够获得均匀、圆整且相对细小的半固态浆料组织。
The microstructure and size characteristics of AlSi7Mg semi-continuous low-superheat semi-continuous casting billets at different heating temperature and holding time were studied by optical microscope and image analyzer. The microstructure and microstructure of remelted AlSi7Mg alloy were investigated by differential thermal analysis And grain growth process. The results show that the remelting heating temperature and holding time together affect the evolution of remelted alloy. With the increase of heating temperature and holding time, the grains gradually become nodular and grow up. The higher the heating temperature, the faster the microstructure evolves. The longer the holding time, the more coarsening and more obvious the grains grow. Effective control of AlSi7Mg alloy remelting heating temperature and holding time, can be uniform, round and relatively small semi-solid slurry organization.