Abstract
A low carbon steel (LCS)/high chromium white cast iron (HCCI) bimetal wear plate about 20 mm in thickness was prepared by liquid-liquid bimetal composite casting technology to substitute for the welding wear plate. A clear and distinguishable composite layer between the LCS and the HCCI was detected with SEM, and the composition and phase were analyzed through EDS and XRD. The composite layer was composed of three sublayers from the LCS to the HCCI: pearlite transition layer, composite layer, and HCCI transition layer. The Vickers hardness from the pearlite transition layer to the HCCI transition layer was 360 HV to 855 HV. The austenite grows as dendrites between the composite layer and the HCCI transition layer under constitutional undercooling. A large amount of C and Cr, and a small amount of Si and Mn dissolve in the matrix. Granular Cr7C3 is uniformly distributed. Due to the solute redistribution at the solid-liquid interface, the primary austenite grows from planar to cellular and finally to the distinct dendrite crystals. The dendrite crystals have an obvious growth direction perpendicular to the composite layer.
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Zun-jie Wei Male, Ph. D., Professor. Research direction: Solidification theory and new materials under ultra high pressure.
This work was financially supported by the National Natural Science Foundation of China Project under grant No. 51371090, the Science and Technology Support Program of 12th Five-Year Plan under grant No. 2011BAD20B03010401, the Educational Department Surface Project of Heilongjiang Province under grant No. 12521519, the Cultivation Plan of the New Century Excellent Talents of Heilongjiang Province under grant No. 1155-NCET-017, the College Student Science and Technology Innovation of Heilongjiang Province under grant No. 201410222037, the College Student Science and Technology Innovation of Jiamusi University under grant No. xsld2014-002, and Graduate Student Science and Technology Innovation of Jiamusi University LZR2014_007
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Zhu, Yc., Wei, Zj., Rong, Sf. et al. Formation mechanism of bimetal composite layer between LCS and HCCI. China Foundry 13, 396–401 (2016). https://doi.org/10.1007/s41230-016-5021-2
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DOI: https://doi.org/10.1007/s41230-016-5021-2