Effect of Machining Damage and Repair on U-2Nb Alloy Corrosion Behavior

In the turning process of U-2Nb alloys, pearlite laminae parallel to the machined surface fractures easily at α phase and γ phase interface, resulting in a discontinuous chip breaking process, which leads to a large amount of damage produced on the workpiece surface. The damaged area will exhibit serious local corrosion behavior during the service process. Through surface rolling deformation treatment, the repair of machined damage can be completed, the smoothness and integrity of the workpiece surface can be further improved, and the microstructure of the surface layer can be refined. The local corrosion behavior of the repaired surface is obviously restrained, meanwhile a compact and stable oxide film that formed in the atmospheric environment can effectively prevent the further development of corrosion.