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2768 |
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Thursday, September 29, 2011, Saal C2.2 10:15 AM Pre- & Post-Treatment 2 |
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Thermal spraying and post-processing of metastable austenitic materials |
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Christian Rupprecht* / Chemnitz University of Technology, Composite Materials Group, Germany Bernhard Wielage/ Chemnitz University of Technology, Composite Materials Group, Germany Matthias Kunze/ Chemnitz University of Technology, Composite Materials Group, Germany |
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Thermal spray processes are widely used to fabricate corrosion and wear-resistant coatings. Typically, these coatings have to be finished to assure the required surface properties, e.g. surface roughness and accuracy. Up to now, grinding has been the most common post-processing for thermally sprayed coatings, but due to the high machining efficiency, turning technologies as a coating post-treatment have recently gained increasing interest. In the current research project, the turning process has been investigated in combination with coatings made of metastable austenitic materials. These iron-manganese-based materials are known to perform a martensitic transformation in case of external stresses and plastic deformation. These stresses are usually applied during operation, e.g. in hammer mills, or by a distinct post-treatment process such as shot blasting. During the turning process, an area of tension is built up around the tip of the turning tool. It should be proved which process requirements are necessary to guarantee a martensitic transformation in thermally sprayed coatings in a subsequent turning process to combine the efficiency of the process with a target-oriented modification of the material properties of the coating. In the presentation, the first results concerning the development and application of appropriate feedstock materials, applicable turning parameters and their effect on the superficial properties of the coating will be discussed. |