Tribological properties of cast iron conditioned by a

The article presents test results of a surface layer of cast iron after subjecting it to grinding and pressure rolling at a variable burnishing force of P = 1000 – 4000 N. The surface roughness, bearing surface, strengthening and stress in the surface layer as well as the microstructure of tested cast irons were determined. The following cast irons were selected for the tests: spheroidal pearlitic EN-GJSP, spheroidal ferritic EN-GJSF, and grey ferritic and pearlitic EN-GJLFP. Experimental study revealed that the surface layer after burnishing had favorable indicators of surface geometric structure and physical properties compared with the surface layer obtained after grinding. After the processes of burnishing and grinding, tribological tests were conducted. They indicate that the surface layer formed in the process of burnishing contributes to the reduction of the friction coefficient and wear. It was demonstrated that the wear process is affected by burnishing force, microstructure and the form of graphite.