Increasing wear resistance of components made of 50MnSi4 steel by Fe-Cr-C-Mo based hardfacing alloys

Abstract

The work aims to evaluate the possibility of increasing the resistance of 50MnSi4 steel to wear by hardfacing Fe-Cr-C-Mo type alloys. For this purpose, two types of filler metals for gas metal arc welding (GMAW) were used -Carbofil A 350 and Magmaweld FCH 360. Metallographic evaluation of the hardfacing structure was performed on the prepared samples, supplemented by hardness measurement. Standard tribological tests were used to test adhesive and abrasive wear resistance. The test results clearly showed that the types of filler metals used for weld cladding significantly increased the resistance of the 50MnSi4 steel substrate to adhesive and abrasive wear. When evaluating the adhesive wear, the positive effect of the hardfacing was manifested not only by a decrease in the weight loss of the samples but also by the coefficient of friction. In the case of the evaluation of resistance to abrasive wear, the best indicators were found in the application of the filler metal Magmaweld FCH 360, where the highest hardness of the martensitic structure of the hardfacing 719 HV0.2 was noticed. K e y w o r d s : hardfacing, weld cladding, gas metal arc welding, adhesive wear, abrasive wear