抄録
In the case of cold spraying, small particles are accelerated to subsonic or supersonic velocity by high temperature and supersonic gas flow, and then impact onto a substrate. When particles impact onto a substrate, kinetic energy of the particles is converted to plastic deformation energy, namely plastic deformation is required for deposition. Because of requirement of plastic deformation, hard materials, such as high carbon steels, can be difficult to deposit on the substrate. And also, due to large plastic deformation, work hardening can be occurred. In this study, in order to develop an innovative repairing technique for high carbon steel by cold spraying, microstructures and hardness property of cold sprayed high carbon steel coatings using high carbon steel powders were evaluated. In order to improve and control the hardness of the coating, spray conditions were optimized and mixed powders of high carbon and mild steels were used. By applying mixed powders, a dense and thick coating with appropriate hardness was obtained.
