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Fabrication of Fe–TiC–Al_2O_3 composites on the surface of steel using a TiO_2–Al–C–Fe combustion reaction induced by gas tungsten arc cladding
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| 【文章作者】Mahmood Sharifitabar;Jalil Vahdati Khaki;Mohsen Haddad Sabzevar; |
| 【文章摘要】 The aim of the present study was to fabricate Fe-TiC-Al_2O_3 composites on the surface of medium carbon steel.For this purpose,TiO_2-3C and 3TiO_2-4Al-3C-xFe(0 ≤ x ≤ 4.6 by mole) mixtures were pre-placed on the surface of a medium carbon steel plate.The mixtures and substrate were then melted using a gas tungsten arc cladding process.The results show that the martensite forms in the layer produced by the TiO_2-3C mixture.However,ferrite-Fe_3C-TiC phases are the main phases in the microstructure of the clad layer produced by the 3TiO_2-4Al-3C mixture.The addition of Fe to the TiO_2-4Al-3C reactants with the content from 0 to 20wt%increases the volume fraction of particles,and a composite containing approximately 9vol%TiC and A1_2O_3 particles forms.This composite substantially improves the substrate hardness.The mechanism by which Fe particles enhance the TiC + A1_2O_3 volume fraction in the composite is determined. |
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