Abstract
Presented in this work are the properties and structure characteristics of MMA (Manual Metal Arc) deposited nanocrystalline coatings (Fe-Cr-Nb-B) applied to an iron nanoalloy matrix on an S355N steel substrate in relation to selected construction materials resistant to abrasive wear currently used in industry. The obtained overlay welds were subjected to macro and microscopic metallographic examinations; grain size was determined by X-ray diffraction (XRD), and chemical composition of precipitates was determined by energy-dispersive X-ray spectroscopy (EDS) during scanning electron microscopy (SEM). The size of the crystalline grains of the Fe-Cr-Nb-B nanocrystalline microstructure was analyzed using an Xpert PRO X-ray diffractometer. Analysis of the test results of the obtained layers of arc-welded Fe-Cr-Nb-B-type alloy confirmed that the obtained layers are made of crystallites with a size of 20 nm, which classifies these layers as nanocrystalline. The obtained nanocrystalline coatings were assessed by hardness and with the use of metal-mineral abrasion testing. The results of the coatings’ properties tests were compared to HARDOX 400 alloy steel.
Highlights
Wearing of machine parts poses an important problem in terms of scientific, technical and economic potential
A, resistance which is for thethe most demanding of in abrasion resistance, tests ofProcedure abrasive wear selected materials examination were carried out accordance was used for the tests
The metallographic examinations of the materials selected for the tests did not show any internal internal or external defects in the layers formed by manual metal arc (MMA) welding with coated electrodes and GMA
Summary
Wearing of machine parts poses an important problem in terms of scientific, technical and economic potential. The structure and properties of the surface layer are, to a large extent, the main factor when considering materials for machine parts in terms of durability. There has been dynamic research in the development of new abrasion-resistant materials containing layers of unique properties and structures differing significantly from previous work. The wide variety of properties inherent to nano-structually modified materials are a paradigm shift, bringing new possibilities through the use of nanomaterial-based surfacing technologies. Nanocrystalline materials are structurally characterized by a high volume fraction at the grain boundaries, which significantly changes their physical, chemical and mechanical properties in comparison to conventional coarse grains, whose grain size is usually on the order of 10–300 μm. Due to the high cost and continuous development of their production technology, nanostructural materials have not been widely applied [28–33]
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