Therm Chip removal processes for improving theproperties of sprayed coatings containing manganese

In many cases, chip removal processes must be utilised for the post-processing of thermally sprayed coatings in order to set the desired surface roughness and dimensional accuracy. The research results published here are based on the idea of using this post-processing step in addition to the rise in the mechanical properties of the coatings, particularly in the hardness and the wear resistance. Metastable, austenitic iron-based materials containing manganese or straight manganese steels which, as solid material, are known to permit the stressinduced phase transformation of the austenite into martensite were selected for this purpose. In order to qualify this group of materials for thermal spraying, more detailed investigations were conducted into the aspects of the processability, the critical stress required for the phase transformation and the resulting coating quality. The arc wire and HVOF technologies were tested as the spraying processes.