Effects of RE,V, Ti and B composite modification on the microstructure and properties of high chromium cast iron containing 3% molybdenum |
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Authors: | Erjun Guo Lihua Wang Liping Wang Yongchang Huang |
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Affiliation: | School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China |
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Abstract: | The effects of RE, V, Ti and B on the microstructure and properties of high chromium cast iron containing 3% molybdenum under
as-cast and heat treatment conditions were investigated with the method of comparing experiments. The results show that with
the increase of RE content, the primary austenite of high chromium cast iron is obviously refined. The morphology of carbide
is changed from netlike and lath to small multiangular isolated blocks or massive blocks, the isolated degree of carbide is
improved obviously, and the size is significantly refined. The addition of V and B into high chromium cast iron can refine
the microstructure, reduce coarse columnar crystals and make the carbide smaller and uniform. Through composite modification
with RE, V, Ti and B, the hardness, wear resistance and impact toughness of high chromium cast iron are increased conspicuously.
After heat treatment, the hardness of high chromium iron is increased significantly, but the toughness and wear resistance
do not show great improvement. |
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Keywords: | high-chromium cast iron rate earth composite modification microstructure mechanical properties |
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