NANOHARDNESS AS A MODERN METHOD OF DIAGNOSTICS OF PRODUCTS SURFACE LAYER QUALITY
Journal Title: Вестник Харьковского национального автомобильно-дорожного университета - Year 2018, Vol 82, Issue
Abstract
Problem. Given the creation of new materials of thin coatings, there is a problem of determining the properties in nanoscale by measuring nanohardness. Goal. The aim of the study is to improve the method of determining nanohardness by continuous indentation, to study the dimensional effect, which allows evaluating the mechanical properties of ma-terials in nanoscale more accurately and efficiently. Method. A steel exemplary measure of hardness was used as a material. Nano-hardness was measured on the Nano Test device (Micro Materials Ltd., Eng-land). According to the results of the measurements on the nanohardness measuring device, the calcula-tions were performed by the "Nano Test Materials Testing Platform" program according to Oliver and Farr Method (which corresponds to the hardness of indentation according to ISO 14577-4: 2007), which is rather complicated and has a limited area of use. The Berkovich Pyramid was used as an indenter. Results. Indenting curve obtained by the “Nano Test Materials Testing Platform” was used to determine nanohardness. The calculations of surface nano-hardness as the ratio of the load to the plane of the lateral surface of the indenter part squeezed in the material were made in the work, and the dependence of the hardness on the load was obtained. The volu-metric nanohardness was also determined as a ratio of load to the volume of the indenter part squeezed into the material, and its dependence on the load was obtained. Scientific novelty. The surface and volumetric nanohardness can be used for materials different in nature, for evaluation of physical and mechanical properties of thin surface-layers. The method of determining the surface and volumetric nanohardness according to the indenting curves possesses great simplicity, accuracy and productivity, because the depth of indenter indentation, which is measured by the device, is used for its calculation. When measuring surface and volumetric nanohard-ness, a dimensional effect is observed – with increas-ing load the magnitude of nanohardness initially decreases, and then it stabilizes. Practical signifi-cance. The methods of determining the surface and volumetric nanohardness allow evaluating the properties of different materials in nanoscale with high precision and productivity.
Authors and Affiliations
V. I. Moschenok, N. O. Lalazarova, І. Е. Kukharevа, S. V. Ponikarovska
Keywords
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- EP ID EP480237
- DOI 10.30977/BUL.2219-5548.2018.82.0.114
- Views 85
- Downloads 0
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