Abstract
The present paper is the result of the investigations of the properties and structure of nanocrystalline layers deposited from iron-based nanoalloy on steel S355N substrate by manual metal arc welding method (MMA) compared to selected abrasion-resistant construction materials currently used in industry. The resultant deposit welds were subjected to macro and microscopic metallographic examination. Working properties of obtained nanocrystalline deposits weld compared to currently used materials were evaluated based on the hardness, abrasive wear of metal-to-mineral. The results of deposits weld working properties measurements were compared with property of wear resistant steel HARDOX 400 type used as reference material.
Highlights
The current scientific, technical and economic issue is the problem of wear of machine parts caused by a decrease in working properties of the working surface
The metallographic examinations of the materials selected for the tests did not show any internal and external defects of the layers made by manual surfacing with coated electrodes and surfacing using GMA method
Measurement of the grain size of the crystallographic nanocrystalline microstructure of Fe-Cr-Nb-B type made using the Xpert PRO X-ray diffractometer from PANalytical showed that the layers were made of crystallites at 20 nm, which classifies these layers as nanocrystalline
Summary
The current scientific, technical and economic issue is the problem of wear of machine parts caused by a decrease in working properties of the working surface. The different properties of materials with a nanostructured structure compared to steel mean that the use of nanomaterials in surfacing technologies brings new possibilities. These nanomaterials are single or multi-phase polycrystals characterized by a microstructural grain size of 1x10-9 to 250x10-9 m. The special heat treatment of cast iron allows to obtain a microstructure consisting of chromium-molybdenum carbides in an almost completely martensitic matrix The base of these abrasive plates is soft structural steel. It is possible to cut flat elements of any shape from abrasion resistant plates and shape them by bending and rolling They are attached to the regenerated substrate with fillet welds, continuous or intermittent, depending on the type of abrasive plate load. The high content of carbon, chromium and niobium allows obtaining a structure similar to that of cast iron with very hard chromium borides, niobium carbides and iron carbides
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