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Decarbonizing of Ductile Cast Iron Surface for Usage in Two-Layered Casting

100%

Rzepka G. , Nawrocki J. , Sieniawski J.

Advances in Manufacturing Science and Technology

2020

tom Vol. 44, nr 4

113--120

The main purpose of the present study is to verify the possibility of decarbonizing the surface of heat-resistant ductile iron GJS-XSiMo5-1 to provide a significant difference in carbon content between this material and gray cast iron EN-GJL-250. In the future, this will allow to increase the diffusion of elements during the creation of the two-layered material using the casting process with materials in a liquid state and solid state. The above method was assumed to solve the problem of defects on turbocharger’s housing in an economically justified manner which occurred in some high-performance premium applications. Evaluation of decarbonized surface quality was investigated by microstructure observation (light microscopy) and alloy elements diffusion (scanning electron microscopy), and hardness measurement and the element content were checked by spark optical emission spectrometry and glow discharge optical emission spectrometry, respectively.

Recovery of Leachate from Everbearing Strawberry Cultivation as an Element of Retardation

51%

Kopeć M. , Mierzwa-Hersztek M. , Gondek K. , Zaleski T. , Bogdał S. , Bieniasz M. , Błaszczyk J. , Kaczmarczyk E. , Knaga J. , Łapczyńka-Kordon B. , Nawrocki J. , Pniak M.

2020

tom Vol. 21, nr 7

197--203

Due to the scale of leachate formation in soilless crop technologies, water and nutrient management is becoming more and more important and can determine the production efficiency. Closed systems, including recirculation or recovery of leachate from fertilisation, are an opportunity to retard unfavourable nutrients and water, which has become an important element of modern technology and has a significant environmental impact. Re-application of leachate, despite very low concentrations of macroand microelements, must be performed taking into account the properties of the substrate/soil, the requirements of the plant and the dose of leachate. In the case of maize cultivation on two soils, irrigation of the crop with leachate from soilless strawberry production led to the soil salinization. From the point of view of the leachate fertiliser value, the source of water for fertigation and the component concentration in the media, which can cause ion imbalance, remain important.