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The Influence of Wall Thickness and Mould Temperature on Structure and Properties of Thin Wall Ductile Iron Castings

100%

Górny M. , Kawalec M. , Witek G. , Rejek A.

tom iss. 2

55--59

The excellent property combination of thin wall ductile iron castings (TWDI), including thin wall alloyed cast iron (e.g. austenitic TWDI) has opened new horizons for cast iron to replace steel castings and forgings in many engineering applications with considerable cost benefits. TWDI is considered as a potential material for the preparation of light castings with good mechanical and utility properties, the cost of which is relatively low. In this study, unalloyed and high Ni-alloyed (25% Ni) spheroidal graphite cast iron, with an austenitic metallic matrix were investigated. The research was conducted for thin-walled iron castings with 2, 3 and 5mm wall thickness, using different mould temperature (20°C, and 160°C) to achieve various cooling rates. The metallographic examinations i.e. characteristic of graphite nodules, metallic matrix, and primary grains of austenite dendrites (in high-nickel NTWDI) and mechanical properties were investigated. The study shows that homogeneity of the casting structure of thin-walled castings varies when changing the wall thickness and mould temperature. Finally, mechanical properties of thin-walled ductile iron castings with ferritic-pearlitic and austenitic metallic matrix have been shown.

Podatność magnetyczna nadprzewodników YBa2Cu3Ox domieszkowanych ZrO2

100%

Woźny L. , Ziaja J. , Witek G. , Mosiądz M.

tom R. 78, nr 11

271-272

Przedstawiono wyniki pomiarów podatności magnetycznej w zależności od temperatury dla nadprzewodników YBa2CU3Ox domieszkowanych ZrO2. Wyznaczono temperatury krytyczne poszczególnych próbek. Omówiono przyczyny braku doskonałego diamagnetyzmu badanych materiałów. Stwierdzono konieczność porównania właściwości magnetycznych z mikrostrukturą i wartościami krytycznych gęstości prądu.

Results of measurements of magnetic susceptibility as function of the temperature for YBa2Cu3Ox doped with ZrO2 were presented. The critical temperatures for individual varieties were disecssed. Reason for observed lack of perfect diamagnetism of tested materials were discussed. Necessity relating of magnetic properties to the microstrukture and critical current density was established.

Impact of Dr Green Prime seed fertilizer on the germination energy and ability of wheat seeds

88%

Gorzelany J. , Matłok N. , Dziura M. , Witek G. , Migut D.

tom Vol. 6, No 4

33--40

The essence of the seed preparation process is the treatment of seed to protect plants against soil pathogens or seed-borne pathogens, as well as against pests attacking plants. Seed fertilizers are mineral fertilizers containing nutrients that, when applied to seed during seed preparation, become readily available to the developing root system during germination and initial plant growth. The purpose of this work was to evaluate the effect of Dr Green Prime seed fertilizer on energy and germination ability of wheat. Within the work wheat seeds in 5 variants were analysed, e.g., with the application of Dr Green Prime seed fertilizer, seed dressing A and fungicide A. The most kernels have germinated in the variant that has been treated with seed dressing A and Dr Green Prime. Only a small level of mould infestation or absence of the infestation was observed for seeds treated with seed dressing A. Aside from germination energy, ability and the level of infestation with moulds, the cotyledons and roots were weighed 12 days after the start experiment. The greatest mass of cotyledons and roots was observed for treatment with seed dressing A and Dr Green Prime 5.5 and 1.7 g, respectively.