The paper presents the results of abrasive wear resistance tests on Creusabro 4800 and Creusabro 8000 steel. The results obtained for laboratory samples were referred to the structure of the examined types of steel and to the basic indicators characterising their mechanical properties. As a result of the conducted tests, which used the methods of light and scanning microscopy, it has been concluded that, in its delivered condition Creusabro, steel exhibits a complex type of structure, characteristic for steel with the “TRIP effect.” The identified type of structure indicates a precisely adjusted chemical composition and the use of specialised heat treatment and forming processes in the production process of those materials. The abrasive wear resistance tests conducted by means of the “spinning bowl” method in real soil masses, i.e. light soil (loamy sand), medium soil (light till) and heavy soil (normal till), as well as the conducted measurements of hardness, have proven the strict dependence of the obtained indicators of abrasive wear resistance on the phase structure and on the status of the heat treatment of the tested steel. The results of abrasive wear resistance tests for Creusabro steel were referred to 38GSA steel in a normalised condition for comparison.

This article analyses the effect of the size of abrasive soil mass grains on the steel wearing process. The study examined Hardox 500 steel used for working parts exposed to abrasive wear. Wear tests were performed under laboratory conditions using the "spinning bowl" method. The study was carried out using natural soil abrasive mass, in which three grain size fractions were distinguished: 0.05-2 mm -sand, 2-16 mm -gravel, 0.05-16 mm -sandy gravel. Steel wearing tests were completed for each fraction as well as for their mixes. The mixes were prepared using one additional fraction with a grain size below 0.05 mm described as dust and loam. The highest wear impact was recorded for the abrasive mass of a gravel (75 %) and dust-loam (25 %) mix. The wear was higher than that obtained for 100 % gravel. The addition of dust and loam had a different effect on the wear impact of sand. A 25 % addition of dust and loam to sand significantly reduced the abrasive wear of samples in comparison to the application of 100 % sand. The abrasive mass of dust and loam resulted in the lowest mass loss of the examined steel. Based on the results obtained from the wearing process in natural abrasive masses, three types of phenomena of steel wear in soil mass could be distinguished, i.e. by micro-cutting, fatigue wear and ploughing. The type of prevailing wear for different mixes of soil fractions depends on the volumetric content of a given fraction in the composition of soil mass. The wear intensity of the experimental steel is higher in mixes of soil fractions than for the particular soil fractions.

This paper presents a comparative study of polyurethane wear in abrasive soil mass. Two types of polyurethanes of various chemical compositions and untreated 38GSA steel were tested, the latter being used as a reference standard. The study was conducted in a natural soil mass at a "rotating bowl" stand. Relative wear resistance was determined from measurements of mass wear for the materials under study. The conditions of the surface of the materials under wear tests were analysed. słowa kluczowe: zużycie ścierne, poliuretany, glebowa masa ścierna, powierzchnia tarcia. StreszczenieW pracy przedstawiono badania porównawcze zużywania poliuretanów w glebowej masie ściernej. Badaniom poddano dwa rodzaje poliuretanów o różnym składzie chemicznym oraz stal 38GSA w stanie nieobrobionym, która była materiałem wzorcowym. Badania prowadzono w naturalnej masie glebowej na stanowisku typu "wirująca misa". Na podstawie pomiarów zużycia wagowego dla badanych materiałów wyznaczono względną odporność na zużycie. Przeprowadzono analizę stanu powierzchni zużywanych materiałów.

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The paper presents the results of experimental studies on abrasion resistance of Hardox 500 steel and 20MnCr5 steel subjected to thermo-chemical treatment. These types of steel are often used for agricultural or construction machinery. Abrasion tests were performed on a T-11 pin using a disc tester. The test conditions correspond to the wear caused by micro-grinding and grain-cutting using particles from the product as well as a result of abrasion produced by loose abrasive material created through the chipping of silica sand grains. The obtained results can be useful in the selection of materials for machine components.