| Название |
Al influence on the phase composition, structure and properties of heat- and wear-resistant cast iron of Cr–Mn–Ni–Ti system |
| Реферат |
The results of the complex research of influence of aluminum and temperature of the cooling metal in the mold on the phase composition, structure, wear resistance, heat resistance (scale resistance and expansion resistance) and mechanical properties of white cast iron of Cr–Mn–Ni–Ti system are presented in the paper. The structure of the surface oxide layers, the distribution of elements between structural components of the alloy and surface oxidation were studied. The chemical composition of oxide and sub-oxide cast iron layers is investigated. It has been established that distribution of the elements through the depth of these layers is determined by alloy composition and cooling conditions. It is shown that the surface oxide layer, which corresponds to the areas of the eutectics, is enriched by manganese (more than 30%), by aluminium (about 10%) and by chromium (by 6%). Manganese has a greater affinity to oxygen than chromium and iron. During oxidation it increases permeability of oxide and decrease heat resistance of metal. Aluminum forms a dense protective film. Diffusion through the oxide film is difficult. Hence the film of location zone, corresponding to the dendrites of austenite, is thin due to high aluminium content, the fi lm of location zone, corresponding to the eutectics, is porous and its thickness increases. Thus, it can be concluded that scale resistance is a structural sensitive property. |
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