High Temperature Oxidation Behavior of New Martensitic Heat-Resistant Steel

Abstract

The research focuses on the high temperature oxidation resistance of martensitic heat-resistant steel. A new type of martensitic heat-resistant steel was developed with the addition of Al and Cu, and the oxidation behavior of the new martensitic heat-resistant steel at 650 °C and 700 °C was analyzed. The high temperature oxidation kinetics curves of new martensitic heat-resistant steel at 650 °C and 700 °C were determined and plotted by cyclic oxidation experiment and discontinuous weighing method. XRD technique was applied to qualitatively analyze the surface oxide of the material after oxidation. The surface and cross-section morphology of the material were observed by field emission scanning electron microscope (SEM) and energy dispersive spectrometer (EDS), and the oxidation mechanism at high temperature was analyzed. The results show that the oxide film can be divided into two layers after oxidation at 650 ºC for 200 h. The outer oxide film is mainly composed of Fe and Cu oxides, and the inner oxide film is mainly composed of Al2O3, SiO2 and Cr2O3. After oxidation at 700 ºC for 200 h, the outer layer is mainly composed of Fe, Cu, Mn oxides, and the inner layer is mainly composed of Cr, Al and Si oxides. The addition of a small amount of Cu promotes the diffusion of Al and Si elements, facilitates the formation of Al2O3 and SiO2, and improves the high-temperature oxidation resistance of martensitic heat-resistant steel.

High-Temperature Oxidation Behavior of Cr-Ni-Mo Hot-Work Die Steels

“…The parabolic rate law was assumed for the sake of simplicity, and the approximate parabolic rate constants k ″ (oxidation constant) of the two test steels were calculated from Figure 2 using the equation: Δ W 2 = k ″ t where Δ W is the weight gain per unit area (mg·cm −2 ), and t is the oxidation time (h) [ 27 ]. The derived k ″ values are shown in Figure 3 with those from previous studies [ 28 , 29 , 30 , 31 ]. As shown in Figure 3 , the oxidation constant k ″ gradually increases as the oxidation temperature rises, indicating a gradual decrease in oxidation resistance with increasing temperature.…”

“… Parabolic rate constants k” of oxidation of two hot-work die steels at 600 °C. The other k” values of hot-work steels were reported by Tilen [ 28 , 29 ], Ziming [ 30 ], and Hong [ 31 ]. …”

Experimental Study of the Evolution of Creep-Resistant Steel’s High-Temperature Oxidation Behavior

“…In the case of an oxidation temperature of 650 • C, Co oxide was identified. As the authors stated in the paper [47] concerning the different intensity of diffraction peaks in XRD patterns, it was found that the oxidation of the materials was accelerated with the increase in experimental temperature. To identify the phases present in the oxidation products, an XRD analysis was also performed on the oxidized surface of the MarBN steel after 3000 h exposure in a mixed environment at a temperature of 650 °C (Figure 10).…”

“…In the case of an oxidation temperature of 650 °C, Co oxide was identified. As the authors stated in the paper [47] concerning the different intensity of diffraction peaks in XRD patterns, it was found that the oxidation of the materials was accelerated with the increase in experimental temperature.…”