ABRASIVE WEAR RESISTANCE OF STEEL M390P AFTER HEAT TREATMENT

In present work abrasive wear resistance after heat treatment of a powder steel M390P with composition 1.9 % C, 0.7 % Si, 0.3 % Mn, 20.0 % Cr, 1.0 % Mo, 4 % V and 0.6 % W was investigated. Machine used for laboratory wear tests is a device that allows to imitate friction conditions in the exploataion of objects. Heat treatment consisting of quenching from 1070ºC in oil and tempering at 450ºC provides maximum hardness of HRC 59 units and suitable for details working at cutting and grinding without high impact load conditions. Quenching from 1150ºC with subsequent twice high temperature tempering at 550ºC achieves hardness of HRC 61. This heat treatment is good for abrasion wear resistance working blades. Hardening at 1070ºC and tempering at 450ºC show wear rate V = 3.6.10-5 g m-1 and E = 27778 m g-1 for abrasive wear resistance. The best parameter values ​​ are respectively V = 1.82.10-5 g m-1 and E = 54745 m g-1 after high temperature quenching at 1150oC and subsequent twice tempering at 550oC.