Mulching metallography

Film covered metallography is to select test points on the test workpiece without damaging the workpiece and ensuring the integrity of the workpiece, polish and erode them, and then copy the parts to be observed with film by the method of Metallographic replica, take them to the laboratory for observation, judge whether the production process of the workpiece is perfect, and find out the reasons for the defects of the workpiece.            1. Gold phase replica technology and its principle            The microstructure of the component metal was obtained by means of the combination of the preformed replica material and the metallographic specimen. In the process of copying, the prepared film is softened with solvent to make it have certain fluidity, then the film is contacted with the metal surface, and the material flow on the film surface is filled with the relief of the image on the grinding surface under pressure to copy the metallographic image.            2. Basic characteristic information of Metallographic replica test and evaluation            The Metallographic replica is a non-destructive inspection technology unique to the metallographic inspection method of boiler and pressure vessel, which can provide the surface state information of relevant component materials. The main information obtained from the replica inspection results include: material aging state, carbide precipitation, growth and spheroidization process, etc.; material damage state, degree of creep hole and cracking tendency, etc.; service temperature state, part Equivalent temperature of piece metal, etc.