Transformation induced plasticity steel with a high content of Al (Al-TRIP) is an advanced high strength steel. The reaction between Al and SiO 2 would lead to compositional changes in mould fluxes, which results in a decrease in SiO 2 content and an increase in Al 2 O 3 content, and influences the physical properties of the molten fluxes. In the present study, the changes of viscosities of a series of mould fluxes with different additives and addition amounts were examined by a rotating viscometer and the crystals in the D series mould fluxes were analysed by scanning electron microscopy and X-ray diffraction. The results show that (a) the Al 2 O 3 in mould fluxes containing Li 2 O presents amphoteric characteristic; (b) the viscosity of the fluxes with 8% B 2 O 3 decreases with the increase in w(Al 2 O 3 )/w(SiO 2 ) ratio, the result shows that the Al 2 O 3 presents alkaline; (c) the viscosity of flux containing both 4% Li 2 O and 5% B 2 O 3 changes a little with the increase in w(Al 2 O 3 )/w(SiO 2 ) ratio. When the Al 2 O 3 content is 30%, the viscosity is 0?204 Pa s and the break temperature is 1130uC; (d) mould fluxes used for Al-TRIP steel precipitate CaF 2 crystals; (e) base on the Riboud model, a suitable viscosity mathematical model for the mould fluxes with high Al 2 O 3 content is established.
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