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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 4    August 2003

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Structural heredity of TiC and its
influences on refinement behaviors of
AlTiC master alloy
WANG Zhen-qing(王振卿), LIU Xiang-fa (刘相法),
LIU Yan-hui(柳延辉), ZHANG Jun-yan(张均燕),
YU Li-na(于丽娜), BIAN Xiu-fang(边秀房)

Key Laboratory of Liquid Structure and Heredity of Materials,
Ministry of Education,Shandong University, Ji'nan 250061, China

Abstract:Heredity of microstructure in AlTiC master alloy, grain refiners, was analyzed. It is found that, for morphologies and distributions of TiC particles, there are visible heredity which originates from raw materials or processing methods of Al melt, and will ultimately be transferred to the solid state structure through the melt stage, and this phenomenon can cause hereditary influences on refinement: formation of chain-like TiC morphology results in rapid refinement fading behavior; distribution of TiC along grain boundaries greatly reduces refinement efficiency. Controlling of structural heredity through proper selections of raw materials and processing parameters is of great importance in obtaining ideal microstructures and improving refinement behaviors of AlTiC master alloys.

 

Key words:  heredity phenomenon; AlTiC master alloy; TiC; grain refinement

ISSN 1672-7029
CN 43-1423/U

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