The influence of aging treatment on precipitation behavior of η phase in a new Ni-Co-Cr fastener superalloy, AEREX350, was investigated by means of optical microscopy, scanning electron microscopy （SEM） and transmi...The influence of aging treatment on precipitation behavior of η phase in a new Ni-Co-Cr fastener superalloy, AEREX350, was investigated by means of optical microscopy, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The precipitation behavior of η phase with two kinds of morphologies in this material was found to be sensitive to the temperature and time of aging treatment. Time-temperature-transformation curves of these two η phase were achieved. Furthermore, diffraction patterns revealed the semi-coherent orientation relationship between η phase and γ matrix. This approach may be used to optimize the microstructure of the alloy for excellent mechanical properties.展开更多
The microstructure of hot rolled AEREX350 alloy under various solution treatments was investigated by scanning electron microscope （SEM） and transmission electron microscope （TEM）. It was found that with increasin...The microstructure of hot rolled AEREX350 alloy under various solution treatments was investigated by scanning electron microscope （SEM） and transmission electron microscope （TEM）. It was found that with increasing solution temperature, η phase precipitated firstly at grain boundaries in parallel at 800 ℃ and then within grains at about 980 ℃. The η phase precipitated at grain boundaries played a role in preventing the migration of grain boundaries, and the η phase precipitated within grains would form Widmannstatten structure with further increasing solution temperature. η phase precipitated at grain boundaries was dissolved at temperature ranging from 1080 ℃ to 1095 ℃, resulting in grain growth promptly owing to release of the pinning effect on grain boundaries. γ phase precipitated during the process of air cooling after hot rolling and dissolved at temperature ranging between 1010 ℃ and 1020 ℃.展开更多
文摘The influence of aging treatment on precipitation behavior of η phase in a new Ni-Co-Cr fastener superalloy, AEREX350, was investigated by means of optical microscopy, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The precipitation behavior of η phase with two kinds of morphologies in this material was found to be sensitive to the temperature and time of aging treatment. Time-temperature-transformation curves of these two η phase were achieved. Furthermore, diffraction patterns revealed the semi-coherent orientation relationship between η phase and γ matrix. This approach may be used to optimize the microstructure of the alloy for excellent mechanical properties.
文摘The microstructure of hot rolled AEREX350 alloy under various solution treatments was investigated by scanning electron microscope （SEM） and transmission electron microscope （TEM）. It was found that with increasing solution temperature, η phase precipitated firstly at grain boundaries in parallel at 800 ℃ and then within grains at about 980 ℃. The η phase precipitated at grain boundaries played a role in preventing the migration of grain boundaries, and the η phase precipitated within grains would form Widmannstatten structure with further increasing solution temperature. η phase precipitated at grain boundaries was dissolved at temperature ranging from 1080 ℃ to 1095 ℃, resulting in grain growth promptly owing to release of the pinning effect on grain boundaries. γ phase precipitated during the process of air cooling after hot rolling and dissolved at temperature ranging between 1010 ℃ and 1020 ℃.
