Effect of titanium and tungsten on the structure and properties of heat-abrasion resistant steel

The effect of Ti and W on the microstructure and properties of austenitic heat-abrasion resistant steel was studied using microstructure examinations, hardness tests, wear resistance and oxidation resistance experiments. The results indicated that the specimens containing Ti and W had a notable increase in hardness and wear resistance, but a slight decrease in oxidation resistance. The structures of specimens with Ti and W included some MC carbides, dispersedly distributed inside grains and at grain boundaries; these specimens also showed an increase in material properties. From oxidation kinetics analysis, the oxidation of austenitic heat-abrasion resistant steel specimens generally agree with parabola rule, oxidation activation energies k p1 and k p2 are calculated to be 304 and 128 kJ/mol. The oxide films composed of Cr 2O 3, spinelle (FeCr 2O 4, NiCr 2O 4), and some Fe 3O 4 were continuous and compact. Cr 2O 3 plays the vital role in the oxidation resistance based on the oxidation activation energy calculation.