低过热度半连续铸造AlMg0.9Si0.6合金重熔工艺的研究  

Study on Reheating Process of AlMg0.9Si0.6 Alloy by Semi-Continuous Casting of Low Superheat

作　　者：赵大志[1] 于福晓[1] 刘芳[2] 何克准[2] 左良[2] 

机构地区：[1]东北大学材料与冶金学院材料成型与控制工程研究所,辽宁沈阳110819 [2]东北大学材料各向异性与织构工程教育部重点实验室,辽宁沈阳110819

出　　处：《铸造》2011年第11期1118-1121,共4页Foundry

基　　金：国家高技术研究发展计划资助项目(2009BAE80B01);国家自然科学基金资助项目(50734006;50771030)

摘　　要：采用光学显微镜及图像分析软件,研究了AlMg0.9Si0.6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AlMg0.9Si0.6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。Microstructures and grain size of AIMg0.9Si0.6 alloy billet prepared by semi-continuous casting of low superheat, and reheated at different heating temperature and with different holding time, were observed by optical microscope. The image analyzing software combining with differential scanning calorimetry （DSC） was used to investigate the microstructure evolution and grain growth during reheating process. The results show that the microstructural evolution is affected by reheating temperature and holding time. With increasing in heating temperature and extending in holding time, the grain grows spherically and gradually. The microstructural evolution is faster and faster with increasing in heating temperature, and the grain grows more and more spherically with extending in holding time. The AIMg0.9Si0.6 alloy billets with homogeneous, round and fine grains can be prepared by effectively controlling reheating temperature and holding time.

关 键 词：半连续铸造 AlMg0.9Si0.6合金 重熔 组织演变 

分 类 号：TG249.7[金属学及工艺—铸造]