Agnieszka Szczotok

The paper summarizes selected examples from quantitative metallography of engineering materials and indicates potential errors which should be avoided. Problems in the areas of sample preparation (cutting, grinding, polishing and etching), microscopic observation, image collection, image processing, quantitative image analysis together with the interpretation of the results were shortly characterized.

The paper concerns testing Cu−Mo coatings deposited over carbon steel C45, which were then eroded with a laser beam. The analysis involved the measurement of macrogeometry and microhardness of selected areas after laser treatment. The coatings were deposited by means of an ELFA-541 device and they were laser treated with a Nd:YAG laser, the parameters being variable.

The paper summarizes the results of observation and quantitative analysis of porosity in IN713C superalloy in as-cast and after the creep test. The sources of porosity in castings are shortly described and the methodology of pores measurement is circumscribed. The results of pores in as-cast and after the creep test were shown and, finally, the interpretation of the result was presented.

W artykule badano wpływ obróbki laserowej na właściwości powłok nanoszonych elektroiskrowo. Ocenę właściwości powłok po obróbce laserowej przeprowadzono na podstawie obserwacji mikrostruktury, analizy składu fazowego oraz pomiarów struktury geometrycznej powierzchni i mikrotwardości. Badania przeprowadzono, wykorzystując elektrody WC-Cu, które zostały wytworzone przez spiekanie nanostrukturalnych proszków. Do nanoszenia powłok elektroiskrowych użyto urządzenie model EIL-8A. Obróbkę laserową nałożonych powłok elektroiskrowych wykonano laserem Nd:YAG, model BLS 720.

The paper is concerned with the performance properties of electro-spark deposited coatings. The properties were assessed by analyzing the coating microstructure, X-ray diffraction, microgeometry, microhardness, and corrosion tests. The studies were conducted using WC-Co-Al2O3 electrodes produced by the sintering of powders. The anti-wear coatings were electrospark deposited over C45 carbon steel by means of an EIL-8A. These coatings are likely to be applied in sliding friction pairs and as protective coatings.