Investigation of Wear Resistance of Austenitic Manganese Cast Iron During Sliding Friction Without a Lubricant,

A study was made of the wear resistance of an austenitic Mn cast iron contg. total C 3.50, combined C 1.12, graphitic C 2.38, Mn 10.67, Si 3.69, P O. 135, and S O. 021 percent in conditions of sliding friction without lubricant under a specific pressure of 2.5-35.0 kgsq cm, the rollers being of steel 45 G2 C O. 40-0, 50 and Mn 1.4-1.8 percent. At low specific pressures, i.e. 2.5-12.5 kgsq cm, Mn cast iron is the as-cast condition has the greatest wear resistance and the steel roller the lowest. In the specific pressure range 12.5-35.0 kgsq cm, the wear of the cast iron and the roller increase smoothly at first and then abruptly. The coefficient of friction in the low specific pressure region decreases, with increasing load, from 0.750 to 0.540. In the 12.5-35.0 kgsq cm range the Mn cast iron has the maximum wear resistance after quenching, the roller wearing less than the cast iron. The coefficient of friction for these specific pressures begins to increase up to 0.870 and then with increasing load decreases to 0.660. At low specific pressures, 2.5-12.5 kgsq cm, Mn cast iron, after annealing and quenching, possesses the least wear resistance. At high specific pressures, 12.5-35.0 kgsq cm, annealed and quenched Mn cast iron has a wear resistance intermediate between quenched cast iron and as-cast cast iron. The roller showed little wear as compared with the cast iron. The coefficient of friction, at specific pressure of 20.0-35.0 kgsq cm with an increase in load decreased from 0.826 to 0.616. Author