High temperature oxidation behavior of high-vanadium wear resistant alloy in different cooling approaches

The oxidation mass increasing method was adopted to explore the oxidation behavior of high-vanadium wear-resistant alloy at 950℃. The oxidation mechanism and cracks behavior were studied with different cooling types (furnace cooling and air cooling). The results indicated that the weight increment per unit area was obviously large at the beginning of the oxidation due to the matrix being in direct contact with the air. Additionally, the oxidation increase gains of furnace and air cooling were 82.7 mg·cm-2 and 39.1 mg·cm-2, respectively, after 8 h of oxidation. At the same time, the preferential formation of Cr2O3 was observed with 50-200 nm at the matrix and oxidation layer interface. Remarkable thermal stress was produced in the oxidation layer due to the larger cooling rate. The warped phenomenon appeared at the oxidation layer due to the production of growth stress. However, the shedding phenomenon rarely occurred in the oxide layer.