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Microstructures and formation mechanism of hypoeutectic white cast iron by isothermal electromagnetic rheocast process

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China Foundry 2010年第2期7卷 113-116页

作者： Zhang Wanning Song Dan Zhang Hongbing Li Deyuan Yuan Xiaoguang Qiu Keqiang Shenyang Government Investment Project Evaluation Center Shenyang 1100141 China School of Materials Science and Engineering Shenyang University of Technology Shenyang 110870 China

An investigation was made on the evolution of microstructures of hypoeutectic white cast iron slurry containing 2.5wt.%C and 1.8wt.%Si produced by rheocasting in which the solidifying alloy was vigorously agitated by electromagnetic stirrer during isothermal cooling *** results indicated that under the proper agitating temperatures and speeds applied,the dendrite structures in white cast iron slurry were gradually evolved into spherical structures during a certain agitating *** also revealed that the bent dendrites were formed by either convection force or by the growth of the dendrites themselves in the bending direction;then,as they were in solidifying,they were gradually being alternated into separated particles and into more spherical structures at the end of the isothermal cooling ***,the dendrites were granulated as the bending process proceeding,which suggested that they were caused by unwanted elements such as sulfur and phosphor usually contained in engineering cast ***-ow of the melt caused corrosion on the dendritic segments where they were weaker in strength and lower in melting temperature because of higher concentration of sulfur or *** the granulation process for such dendrites formed in the melt became possible under the ***,dendrite fragments are another factors considerable to function for spherical particles formation.A new mechanism,regarding to the rheocast structure formation of white cast iron,was suggested based on the structural evolution observed in the study.

关键词： white cast iron rheocasting structural evolution structures formationmechanism

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