Irmantas Gedzevičius

The Study of Vehicle Traffic Noise

Santrauka. Straipsnyje nagrinėjama automobilių keliamo triuksmo žala eismo dalyviams ir aplinkiniams, taip pat apžvelgiami Lietuvoje ir Europos Sąjungoje galiojantys dokumentai, reglamentuojantys triuksmo prevenciją ir ateityje įgyvendinamas triuksmo mažinimo priemones. Eksperimentinėje dalyje pateikiama aikstelėje stovincių automobilių variklių keliamo triuksmo matavimo metodika ir miesto teritorijoje transporto srauto sukelto triuksmo eksperimentiniai tyrimai. Remiantis gautais rezultatais pateikiamos isvados.

Effect of alloying additives on impact-abrasive wear of manual arc welded hadfield steel hardfacings

The results of studying the impact-abrasive wear of manual arc welded Hadfield steel hardfacings and this steel alloyed with Cr, Ni, Mo, B, Cu, and Si, both without and with coarse-grained tungsten carbide reinforcement, are presented. It has been found that under conditions of impactless wear the presence of the hardening phase in the Hadfield steel increases its wear by 40% on average compared to the wear of the base and alloyed Hadfield steels. With an increase in the impact energy from 2.8 to 5.6 J, the wear of the reinforced Hadfield steels decreases and becomes comparable with the wear of the base and alloyed Hadfield steels. Under the conditions of erosion by coarse particles, layers of the Hadfield steel reinforced by tungsten carbide have slightly lower wear rate than unreinforced ones.

Wear and Corrosion Resistance of Electric-ARC Coatings Sprayed from Powder Wires of the Stein-Mesyfil Series

We investigate the influence of the chemical composition and modes of spraying of electric-arc coatings from powder wires of the Stein-Mesyfil series, in particular, 953V, 932V, 954V, and 957V, on their abrasive wear resistance and corrosion characteristics. It is established that all coatings obtained at a current of arc burning of 350 А, have the smallest porosity and largest resistance to abrasive wear resistance, and coatings obtained from 932V and 957V wires are most wear resistant. An influence of the chemical composition and spraying modes on the electrochemical properties of the coatings in a 3% solution of sodium chloride is not found.

The Research of Thermal Arc Sprayed Coatings Tribological Properties by Using Rubber Wheel Test

This paper present the result obtained from new experimental STEIN-MESYFIL 953 V; STEIN-MESYFIL 954 V coatings. The surfacing material was wires of 1.6 mm diameter. The tests aimed at determining wear resistance of coatings sprayed on steel substrate. The investigation shows that the tribological behaviour of new experimental thermal arc sprayed coatings is greatly affected by its microstructural constituents such as porosity, oxide inclusions, and microhardness of coatings. Results show that increasing porosity of coatings twice, it doubles the mass loss. Results for thermal sprayed coatings of all experiments showed their high wear resistance and are discussed.