Melt conditioning by advanced shear technology (MCAST) for refining solidification microstructures
Melt conditioning by advanced shear technology (MCAST) for refining solidification microstructures
复制标题
通过先进剪切技术 (MCAST) 进行熔体调节，以细化凝固微观结构
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
G. Scamans
中科院分区：
文献类型：
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作者：
Z. Fan;M. Xia;H. Zhang;G. Liu;J. Patel;Z. Bian;I. Bayandorian;Y. Wang;H. Li;G. Scamans
摘要MCAST （melt conditioning by advanced shear technology）是近年来发展起来的一项在凝固前对液态金属进行调理的新型加工技术。MCAST工艺采用双螺杆机构，对液态金属施加高剪切速率和高强度的湍流，使被调节的液态金属温度均匀，化学成分均匀，氧化物颗粒分散均匀，粒度细，粒度分布窄。显微组织的细化是通过在随后的凝固过程中提高非均相成核率和提高核存活率来实现的。本文介绍了MCAST工艺及其在轻合金异型铸造和连铸中组织细化的应用。
Abstract MCAST (melt conditioning by advanced shear technology) is a novel processing technology developed recently for conditioning liquid metal prior to solidification processing. The MCAST process uses a twin screw mechanism to impose a high shear rate and a high intensity of turbulence on the liquid metal, so that the conditioned liquid metal has uniform temperature, uniform chemical composition and well-dispersed and completely wetted oxide particles with a fine size and a narrow size distribution. The microstructural refinement is achieved through an enhanced heterogeneous nucleation rate and an increased nuclei survival rate during the subsequent solidification processing. In this paper we present the MCAST process and its applications for microstructural refinement in both shape casting and continuous casting of light alloys.