High temperature oxidation behaviors of FGH96 P/M superaUoy have been studied in air at temperatures ranging from 600 to 1000℃. By means of isothermal oxidation testing, X-ray diffraction, SEM （scanning electron mic...High temperature oxidation behaviors of FGH96 P/M superaUoy have been studied in air at temperatures ranging from 600 to 1000℃. By means of isothermal oxidation testing, X-ray diffraction, SEM （scanning electron microscopy）, and EDS （energy dispersive X-ray spectroscopy） analyses, the oxidation kinetics as well as the composition and morphology of scales were investigated. Thermodynamic calculations were used to explain the oxidation mechanism. The results showed that as the oxidation temperature increased, the oxidation rate, the scale thickness, and scale spallation increased. FGH96 P/M superalloy exhibits good oxidation resistance at temperature below 800℃. The oxidation kinetics follows an approximately parabolic rate law, and the oxide layer was mainly composed of Cr2O3 TiO2 and a little amount of NiCr2O4. The oxidation is controlled by the transmission of chromium. titanium, and oxygen through the oxide scale.展开更多
The segregation behavior of sulfur and phosphorus has been studied by means of scanning Auger microprobe (SAM) on microstructural interfaces,such as grain boundaries and carbide/matrix interfaces,The experimental resu...The segregation behavior of sulfur and phosphorus has been studied by means of scanning Auger microprobe (SAM) on microstructural interfaces,such as grain boundaries and carbide/matrix interfaces,The experimental results clearly reveal that sulfur strongly segregates on carbide/matrix interfaces,while phosphorus predominantly distributes on grain boundaries. Molybdenum tends to segregat on grain boundaries.展开更多
文摘High temperature oxidation behaviors of FGH96 P/M superaUoy have been studied in air at temperatures ranging from 600 to 1000℃. By means of isothermal oxidation testing, X-ray diffraction, SEM （scanning electron microscopy）, and EDS （energy dispersive X-ray spectroscopy） analyses, the oxidation kinetics as well as the composition and morphology of scales were investigated. Thermodynamic calculations were used to explain the oxidation mechanism. The results showed that as the oxidation temperature increased, the oxidation rate, the scale thickness, and scale spallation increased. FGH96 P/M superalloy exhibits good oxidation resistance at temperature below 800℃. The oxidation kinetics follows an approximately parabolic rate law, and the oxide layer was mainly composed of Cr2O3 TiO2 and a little amount of NiCr2O4. The oxidation is controlled by the transmission of chromium. titanium, and oxygen through the oxide scale.
文摘The segregation behavior of sulfur and phosphorus has been studied by means of scanning Auger microprobe (SAM) on microstructural interfaces,such as grain boundaries and carbide/matrix interfaces,The experimental results clearly reveal that sulfur strongly segregates on carbide/matrix interfaces,while phosphorus predominantly distributes on grain boundaries. Molybdenum tends to segregat on grain boundaries.
