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http://dx.doi.org/10.7777/jkfs.2015.35.6.178

Effect of Primarily Solidified Structure on the Microstructure and the Mechanical Properties of High Cr White Iron  

Jo, Hyun-Wook (Department of Metallurgy and Materials Engineering, Changwon National Univ.)
Do, Jeong-Hyeon (High Temperature Materials Department, Korea Institute of Materials Science)
Jo, Won-Je (Department of Materials Science and Engineering, Seoul National Univ.)
Chung, Hyun-Deuk (KYM-Tech.Co., Ltd.)
Lee, Je-Hyun (Department of Metallurgy and Materials Engineering, Changwon National Univ.)
Jo, Chang-Yong (High Temperature Materials Department, Korea Institute of Materials Science)
Publication Information
Journal of Korea Foundry Society / v.35, no.6, 2015 , pp. 178-184 More about this Journal
Abstract
Due to excellent abrasion resistance the high-chrome white irons are widely used in mining and mineral industries. Minor variation of carbon content in 28% chrome white iron resulted in difference in primarily solidified microstructure. Sub-eutectic (hypoeutectic) composition led to formation of primarily solidified dendrites. Formation of primarily solidified dendrites which were supersaturated with carbon and chrome also caused precipitation of fine secondary carbides that are different from relatively large plate type $M_7C_3$ carbides in the eutectic structure. Small portion of primarily solidified dendrite expected to contribute significantly to the improvement of abrasion resistance of the white iron because the dendrites provided mechanical support to carbides. The relative fraction of primary dendrite increased with reduction of carbon content from the eutectic composition. The increased fraction of primary dendrite increased hardness value of the white irons.
Keywords
White iron; Abrasion resistance; Carbide; Sub-eutectic composition;
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