Abstract
The oxidation kinetics and behavior of vanadium carbide particle-reinforced Fe-based composites (VCps-Fe-MC) were investigated at 600, 800, and 950 °C. The microstructure of the surface and cross-section of the oxidation layer was characterized by scanning electron microscope (SEM). The composition of the surface of the oxide scales was examined by X-ray diffraction (XRD) and energy-dispersive spectroscopy (EDS). The micro hardness of the specimens was measured by a micro-hardness tester after a high-temperature treatment and subsequent air cooling. The results showed that the growth of the oxide scales on the VCps-Fe-MC followed a parabolic curve with an increase in the oxidation time. In addition, the weight gain increased with the oxidation temperature during the same period. Different oxide scales and oxidation rates occurred in some regions due to different textures. The minimum oxidation rate was in the austenite region because of a high silicon and chromium contents. At the same time, severe cracking and large shedding of the oxide scales were discovered due to growth stress and thermal stress. These defects can provide channels for oxygen diffusion. Based on the micro-hardness values, temperatures greater than 900 °C can be regarded as austenitizing temperatures during heat treatment to improve the mechanical properties and the wear resistance.
Highlights
Vanadium carbide1 has the advantages of high hardness, excellent high-temperature strength, good corrosion resistance, and high chemical and thermal stability, even at high temperatures.2–4 it is widely used in industrial applications.5–7 Vanadium carbide in alloys, such as austenite/martensite steel and cast iron, is formed by a chemical reaction at high temperatures ranging from 1100 ◦C to 1500 ◦C2,8,9 and improves the mechanical properties and wear resistance of composites
Jackson et al.24 oxidized Fe-Mn-Al alloys for 100 hours at 600, 800, and 1000 ◦C respectively; the results indicated that Fe-Mn-(5-10)%(6-10)%Al exhibited a good high-temperature oxidation resistance due to the formation of a dense Al2O3 oxidation layer
The high-temperature oxidation behavior of a vanadium carbide particle-reinforced Fe-based composite (VCps-Fe-MC) composition and morphology of the oxidation layer were studied by scanning electron microscope (SEM), energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD) analysis
Summary
Vanadium carbide has the advantages of high hardness, excellent high-temperature strength, good corrosion resistance, and high chemical and thermal stability, even at high temperatures. it is widely used in industrial applications. Vanadium carbide in alloys, such as austenite/martensite steel and cast iron, is formed by a chemical reaction at high temperatures ranging from 1100 ◦C to 1500 ◦C2,8,9 and improves the mechanical properties and wear resistance of composites. Vanadium carbide has the advantages of high hardness, excellent high-temperature strength, good corrosion resistance, and high chemical and thermal stability, even at high temperatures.. Vanadium carbide has the advantages of high hardness, excellent high-temperature strength, good corrosion resistance, and high chemical and thermal stability, even at high temperatures.2–4 It is widely used in industrial applications.. Vanadium carbide in alloys, such as austenite/martensite steel and cast iron, is formed by a chemical reaction at high temperatures ranging from 1100 ◦C to 1500 ◦C2,8,9 and improves the mechanical properties and wear resistance of composites. A heat treatment is used to improve the properties of the high-vanadium Fe-matrix composites. The high-temperature oxidation behavior of a vanadium carbide particle-reinforced Fe-based composite (VCps-Fe-MC) composition and morphology of the oxidation layer were studied by scanning electron microscope (SEM), energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD) analysis. The growth and exfoliation mechanisms of the oxidation scales were explored and the microhardness of the specimens at different temperature and different time were examined after air cooling
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