Measurement of friction in galling testing – An example of its use in characterising the galling behaviour of hardfacings at ambient and elevated temperature

Galling is a category of severe adhesive wear that defined by surface damage arising between sliding solids, distinguished macroscopic, usually localized, roughening and creation protrusions above the original surface. The identification galling through visual observation tested therefore inherently subjective. Due to microscopic processes behind onset being poorly understood, further work needed understand behaviour different materials under conditions, both at room temperature elevated temperature. current paper describes development new testing apparatus, broadly ASTM G196 configuration with addition in-situ torque measurements, an automated worm drive for sample rotation as well band heaters providing capability temperatures up maximum applied stress 950 MPa. Results from tests conducted temperate 300 °C Stellite 6 (Co-based) Tristelle 5183 (Fe-based) hardfacings are presented. results show resistance significantly reduced (<52.8 MPa) compared (158.3 MPa). In case 6, was not observed either or • Automated has been developed. Torque measurement highlighted differences test conditions. did gall pressures MPa across range. fell increased. changes during provide information regarding evolution.