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Modification of Structure and Properties of Surface Layer of Grey Cast Iron under High Energy Electron Beam

100%
Alexandrova N., Mackushev S., Melnikov V.
Acta Physica Polonica A
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1996
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vol. 89
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issue 3
383-387
EN
The effect of high energy electron beam irradiation on the crystalline structure and mechanical properties of the surface layer of grey cast iron has been investigated by light and electron microscopy, X-ray analysis as well as microhardness measurements. The electron irradiation leads to the formation of modulated structure of the surface layer, which provides the combination of the high hardness level and the high wear resistance. These properties are caused by the high density of the structural defects in austenite phase, the formation of the high number of dispersed carbides and the existence of a set of phases from ledeburite till sorbite with high level of hardness.
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Mechanical Properties of Surface Strengthened Materials and Designing of Surface Layers

100%
Haś Z., Nakonieczny A.
Acta Physica Polonica A
|
1996
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vol. 89
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issue 2
155-169
EN
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.
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