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1996 | 89 | 2 | 155-169
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Mechanical Properties of Surface Strengthened Materials and Designing of Surface Layers

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Technological surface layers, most often met in practice, received by the methods of heat, thermo-diffusion, mechanical and chemical treatment have been described. The range of application of surface layers received as a result of various technological treatments have been presented. Improvement of mechanical properties of the machine elements and constructions after surface treatment is the subject of this paper. The changes of mechanical, static and fatigue properties as well as impact strength, crack resistance and friction properties, such as wear resistance, seizing resistance and friction factor have been discussed. It has been found that the efficiency of the improvement of mechanical properties is a function of technological parameters and of a type of destruction being a result of the mechanical external loads. We claim that it is possible to design surface layers in dependence on the parameters of processing, or on the structure of the layers (determined by hardening, residual stresses) and on the mechanical external loads of machine parts and constructions. Methods of designing surface layers, useful in practice, have been presented. Examples of changes of the mechanical properties after surface treatment have been given.
  • Łódź Technical University, Stefanowskiego 1, 90-924, Łódź, Poland
  • Institute of Precision Mechanics, Duchnicka 3, 00-967 Warszawa, Poland
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