Microstructural Evolution of AlSi7Mg Alloy Prepared by Semi-continuous Casting at Low Superheat during Reheating

Zhao Dazhi1; Yu Fuxiao1; He Kezhun2; Liu Fang2; Zuo Liang2

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Microstructural Evolution of AlSi7Mg Alloy Prepared by Semi-continuous Casting at Low Superheat during Reheating
Vol. 31, Issue 10, Pages: 917-920(2011)
Published： 2011 ，
DOI：

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[1]赵大志,于福晓,何克准,刘芳,左良.AlSi7Mg合金低过热度半连续铸造组织的重熔演变[J].特种铸造及有色合金,2011,31(10):917-920.

Zhao Dazhi1, Yu Fuxiao1, He Kezhun2, et al. Microstructural Evolution of AlSi7Mg Alloy Prepared by Semi-continuous Casting at Low Superheat during Reheating. [J]. Special Casting & Nonferrous Alloys 31(10):917-920(2011)
[1]赵大志,于福晓,何克准,刘芳,左良.AlSi7Mg合金低过热度半连续铸造组织的重熔演变[J].特种铸造及有色合金,2011,31(10):917-920. DOI：

Zhao Dazhi1, Yu Fuxiao1, He Kezhun2, et al. Microstructural Evolution of AlSi7Mg Alloy Prepared by Semi-continuous Casting at Low Superheat during Reheating. [J]. Special Casting & Nonferrous Alloys 31(10):917-920(2011) DOI：

摘要

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。

Abstract

Microstructure and grain size of AlSi7Mg alloy billet prepared by semi-continuous casting at low superheat

which was reheated at different heating temperatures and holding time

were observed by optical microscope and image analyzing software to understand microstructure evolution and grain growth during reheating process combining with differential scanning calorimetry（DSC） . The results reveal that microstructure evolution is closely related with reheating temperature and holding time. With increasing in heating temperature and holding time

grain is grown spherically

and microstructure evolution is faster and faster with increasing in heating temperature. Grain is grown more and more spherically with extending in holding time. The AlSi7Mg alloy billets with homogeneous and spherical as well as fine structure can be prepared by effectively controlling reheating temperature and holding time.