Abstract Scope |
The operating temperature of the high pressure turbine in the USC(ultra super critical)power generation environment is 600°C-650°C, but the A-USC power generation environment is a high efficiency power generation environment where the operating temperature of the high pressure turbine is 700°C-760℃. For this reason, it is impossible to use the austenitic heat-resistant steel which is currently used in the high-pressure turbine. Instead of it, Ni-base superalloy should be used for the high temperature usage. A variety of casting alloys that can be applied as casing components to A-USC thermal power plants are being studied worldwide and alloy 263, 282, 625, and 740Hare one of the candidates. In this study, we evaluated these materials. The differences in microstructure were analyzed by optical microscope, scanning electron microscope.Mechanicaltestssuch as tensile test, hardness test, and creep test were also conducted. |