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Manufacturing of ZrO2-Ni graded composites via centrifugal casting in the magnetic field

Wachowski M., Kosturek R., Winkler H., Miazga A., Lada P., Kaszuwara W., Konopka K., Zygmuntowicz J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2020

Vol. 68, nr 3

539--545

The paper presents the possibility of fabricating ceramic-metal composites by an innovative method of centrifugal slip casting in the magnetic field. It was examined whether the use of this method would allow obtaining a gradient concentration of metal particles in the ceramic matrix. In the applied technique, the horizontal rotation axis was used. The study investigated the effect of solid phase content on the properties and microstructure of the products. Water-based suspensions with 35, 40, 45 and 50 vol.% of solid-phase content were prepared with 10 vol.% additional of nickel powder. The viscosity of prepared slurries was considered. The gradient distribution of nickel particles in the zirconia matrix was observed on SEM. Vickers hardness of ZrO2-Ni composites has been measured. The research revealed that the physical properties depend on the volume fraction of solid content and increase as the volume of solid content increases.

Microstructure and fatigue life of Cp-Ti/316L bimetallic joints obtained by means of explosive welding

Wachowski M., Śnieżek L., Szachogłuchowicz I., Kosturek R., Płociński T.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2018

Vol. 66, nr 6

925--933

This paper describes a study of explosively welded, commercially pure titanium-stainless steel 316L plates. Following welding, the plates were heat-treated at the temperature of 600°C for 90 minutes. Examinations of the bond structure were carried out before and after heat treatment to investigate the processes taking place during explosive welding of materials. Observations were performed using light, scanning electron (SEM) and transmission electron microscopy (TEM). The mechanical properties were examined applying three-point bending tests with cyclic loads. Fractographic examination and hardness measurements were also performed. It has been found that the bonding zones are characterized by a specific microstructure, chemical composition and microhardness. The heat treatment used in the study increases the relative volume of brittle intermetallic phases, causing a reduction in fatigue strength of the joint.

Badania nad zastosowaniem zgrzewania wybuchowego do uzyskania bimetalicznych blach z udziałem staliwa Hadfielda

Kosturek R., Maranda A., Senderowski C., Zasada D.

Materiały Wysokoenergetyczne

2016

T. 8

91--102

Celem pracy było otrzymanie zgrzewanych wybuchowo blach stalowych 22G2A i 15HM z odpornym na ścieranie staliwem Hadfielda za pomocą amonowo-saletrzanych materiałów wybuchowych. Analizowano właściwości strukturalne oraz stopień umocnienia utworzonego złącza, określając jednocześnie odporność na zużycie erozyjne staliwa Hadfielda w stanie po zgrzaniu wybuchowym, w porównaniu do stali 65G stosowanej na elementy koła bijakowego w kotłach pyłowych.

The purpose of this work was to weld steel sheets with sheets made of Hadfield steel (mangalloy) using industrial explosives. The degree of strengthening of the Hadfield steel layer and the structure of the bond between the welded steels, was examined. The results of erosive wear testing between steel 65G (used in hammer mills) and welded Hadfield steel has been compared.