Qualitative and quantitative analysis of titanium precipitate phases in hot rolled enamel steel with different isothermal situation
Hot rolled enamel steels are required to have sufficient fish-scale resistance.Improving the hy-drogen storage property,that is,increasing the hydrogen trap,the most effective method is to increase the content of precipitated phase in the steel.In this paper,in order to quantitatively analyze the precipitates of hot-rolled enamel steels with different aging treatments,the precipitates are separated from the matrix by electrolysis extraction method.The morphology and structure of the precipitates after extraction are characterized by scanning electron microscopy(SEM)and X-ray diffraction(XRD).Rietveld full spectrum fitting method is used to calculate the composition and content of different precipitates.The nano-scale precipitates are characterized by transmission electron microscopy(TEM)and three dimensional atomic probe(3DAP).Finally,the relationship between precipitate phase and hydrogen storage property in hot rolled enamel steel is discussed.The XRD results show that the main kinds of precipitate in hot-rolled en-amel steel are Ti2CS,TiC0.95 and TiC0.3 N0.7.TEM results show that the precipitates with diameter above 150 nm contain sulfur,which are carbon sulfide titanium.Precipitates with diameter about 100 nm are tita-nium carbide,and a large amount of precipitation with diameter about 10 nm,with disordered distribution,which are confirmed as titanium carbide by 3DAP.The sample treated at 850 ℃ has the highest precipitati-on content,reaching 0.39,％,and the specific surface area of the particles is also the largest.The hydrogen penetration experiment shows that it has the longest average penetration time and higher hydrogen storage performance.
hot rolled enamel steelprecipitate phaseisothermal treatmentelectrolysisqualitative and quantitative analysis
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