Austenite Stainless Steel Life Evaluation Method

摘要

The present invention provides a method for evaluating the lifetime of a high-temperature facility for a thermal power plant made of austenitic stainless steel, comprising: a specimen collecting step (S110) of collecting a cross-section and a longitudinal section as a specimen from a high-temperature facility of a thermal power plant made of austenitic stainless steel; a specimen cutting step (S120) of cutting the specimen to an appropriate size; After cutting, the lubricating component of the specimen is removed with a cleaning solution or a cleaning step of removing particles remaining on the surface of the specimen through ultrasonic cleaning (S130); a specimen mounting step (S140) of fixing a specimen made of an austenitic stainless steel material to be polished; Using a sand paper, grinding (Grinding) the specimen primary grinding step (S150) and; A secondary polishing step of polishing using alumina or diamond suspension according to the material (S160); An etching step (S170) of corroding the polished surface to be observed with an etchant to observe the microstructure because it corrodes differently depending on the degree of corrosion of the grain boundary, the type of phase, the crystal direction, the precipitation phase, etc.; a drying step (S180) of washing the etchant with acetone, ethanol, or methanol and drying it so that the etchant does not remain on the specimen; a specimen observation step of observing the microstructure of the austenitic stainless steel constituting the specimen (S190); Austenitic stainless steel thermal power plant high temperature facility life evaluation method, characterized in that it comprises a.