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AN ASSESSMENT OF NITROGEN CONTENT EFFECT ON THE MECHANICAL PROPERTIES OF MARTENSITIC CAST STEEL


The GX5CrNiCu16-4 martensitic cast steel with graded nitrogen content comprised in a range of 0,064-0,12% was melted; the chemical composition, including oxygen and nitrogen content, was determined. Test bars were ...

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A NOVEL METHOD FOR THE OXYGEN ACTIVITY MEASUREMENT APPLIED IN CONTROL OF THE DUCTILE IRON MANUFACTURING PROCESS


The objective of the present study was to evaluate a method for the measurement of oxygen activity in liquid cast iron to predict the cast iron properties after solidification. A series of experimental melts were made, testing the activity of oxyg...

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Processes of pyrolysis and their effect on cast quality and working conditions


The article discusses the thermal processes undergone by the sand mould in contact with the liquid casting alloy. Depending on the character of the atmosphere in the mould, this can be the process of combustion or pyrolysis (when there is no oxyge...

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Thermophysical properties of Cu-C composites obtained by powder metallurgy


Studies of composite materials of the Cu-C type with additives of different forms of carbon (carbon nanopowder, carbon nanotubes and reduced graphene oxide) were performed by the powder metallurgy method. Based on the structural tests conducted by...

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A comparison of the oxygen, nitrogen and hydrogen content in ductile iron castings and their effect on microstructure and mechanical properties


Two different spheroidization methods were compared in terms of the effect they may have on gas content (oxygen, nitrogen and hydrogen) in ductile iron castings and process efficiency.Two methods of cast iron treatment were investigated, i.e...

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Measurement of gas contents in a metal bath as a method for the optimisation of deoxidation and modification procedures for cast steel


The paper presents the results of works concerning the optimisation of the process of steel melting for castings of industrial fittings in an induction furnace with an acid lining. Materials containing high activity elements such as Al, Ca, Ti, Zr...

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