Features of Measuring the Hardness of a Metal Surface Modified with Ultrafine Particles of Minerals
One of the important characteristics of the surface properties of metal parts subjected to friction is hardness. Hardness measurements are important for determining the operational characteristics of parts and monitoring the technological regimes of surface modification. However, hardness measuremen...
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Belarusian National Technical University
2020-09-01
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| Series: | Приборы и методы измерений |
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| Online Access: | https://pimi.bntu.by/jour/article/view/665 |
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| author | A. V. Skazochkin G. G. Bondarenko P. Żukowski |
| author_facet | A. V. Skazochkin G. G. Bondarenko P. Żukowski |
| author_sort | A. V. Skazochkin |
| collection | DOAJ |
| description | One of the important characteristics of the surface properties of metal parts subjected to friction is hardness. Hardness measurements are important for determining the operational characteristics of parts and monitoring the technological regimes of surface modification. However, hardness measurements of thin modified layers made by different methods can lead to differences in measurement results. The aim of the article was to study the hardness of a metal surface modified with ultrafine particles of minerals by two different methods (instrumental indentation and Vickers hardness measurement) and a comparative analysis of the measurement results obtained by these methods.Standard Vickers hardness measurements at loads of 0.025, 0.1 and 0.5 kgf showed a qualitative difference between the hardness values of the two samples modified with different mixtures of ultrafine particles of minerals and a large heterogeneity of the hardness values over the area. By the method of instrumental hardness, standard measurements were performed without preliminary selection of the indentation site (at a load of 1.05 N) and measurements during indentation into even sections (at low loads of 10 mN).It is noted that the high precision of measurements implemented by instrumental indentation, due to the large roughness of the samples, leads to large values of the error in calculating the measurement results. An additional difference in the results of measurements performed by two methods at shallow indentation depths may be due to the fact that the object under study has a complex structure consisting of a metal matrix and particles distributed over the depth of the sample. A possible way out of the situation lies in the transition from the use of hardness measures when calibrating instruments to standard samples of properties for which the constancy of mechanical properties in the measured range of indentation depths will be ensured, but which are not yet available in research practice. Therefore, at present, when carrying out work related to the search for optimal conditions for obtaining thin wear-resistant layers on the surface of metals modified with ultrafine particles of minerals, comparative measurements performed by one measurement method are recommended. |
| format | Article |
| id | doaj-art-36a5c0017ecc444d829dad0a2d1fdd01 |
| institution | Kabale University |
| issn | 2220-9506 2414-0473 |
| language | English |
| publishDate | 2020-09-01 |
| publisher | Belarusian National Technical University |
| record_format | Article |
| series | Приборы и методы измерений |
| spelling | doaj-art-36a5c0017ecc444d829dad0a2d1fdd012025-02-03T05:16:51ZengBelarusian National Technical UniversityПриборы и методы измерений2220-95062414-04732020-09-0111321222110.21122/2220-9506-2020-11-3-212-221520Features of Measuring the Hardness of a Metal Surface Modified with Ultrafine Particles of MineralsA. V. Skazochkin0G. G. Bondarenko1P. Żukowski2Kaluga branch of the Russian Presidential Academy of National Economy and Public AdministrationNational Research University Higher School of Economics3Lublin University of TechnologyOne of the important characteristics of the surface properties of metal parts subjected to friction is hardness. Hardness measurements are important for determining the operational characteristics of parts and monitoring the technological regimes of surface modification. However, hardness measurements of thin modified layers made by different methods can lead to differences in measurement results. The aim of the article was to study the hardness of a metal surface modified with ultrafine particles of minerals by two different methods (instrumental indentation and Vickers hardness measurement) and a comparative analysis of the measurement results obtained by these methods.Standard Vickers hardness measurements at loads of 0.025, 0.1 and 0.5 kgf showed a qualitative difference between the hardness values of the two samples modified with different mixtures of ultrafine particles of minerals and a large heterogeneity of the hardness values over the area. By the method of instrumental hardness, standard measurements were performed without preliminary selection of the indentation site (at a load of 1.05 N) and measurements during indentation into even sections (at low loads of 10 mN).It is noted that the high precision of measurements implemented by instrumental indentation, due to the large roughness of the samples, leads to large values of the error in calculating the measurement results. An additional difference in the results of measurements performed by two methods at shallow indentation depths may be due to the fact that the object under study has a complex structure consisting of a metal matrix and particles distributed over the depth of the sample. A possible way out of the situation lies in the transition from the use of hardness measures when calibrating instruments to standard samples of properties for which the constancy of mechanical properties in the measured range of indentation depths will be ensured, but which are not yet available in research practice. Therefore, at present, when carrying out work related to the search for optimal conditions for obtaining thin wear-resistant layers on the surface of metals modified with ultrafine particles of minerals, comparative measurements performed by one measurement method are recommended.https://pimi.bntu.by/jour/article/view/665hardnessmetal surfacevickers measurementsindustrial indentationmineral coatings |
| spellingShingle | A. V. Skazochkin G. G. Bondarenko P. Żukowski Features of Measuring the Hardness of a Metal Surface Modified with Ultrafine Particles of Minerals Приборы и методы измерений hardness metal surface vickers measurements industrial indentation mineral coatings |
| title | Features of Measuring the Hardness of a Metal Surface Modified with Ultrafine Particles of Minerals |
| title_full | Features of Measuring the Hardness of a Metal Surface Modified with Ultrafine Particles of Minerals |
| title_fullStr | Features of Measuring the Hardness of a Metal Surface Modified with Ultrafine Particles of Minerals |
| title_full_unstemmed | Features of Measuring the Hardness of a Metal Surface Modified with Ultrafine Particles of Minerals |
| title_short | Features of Measuring the Hardness of a Metal Surface Modified with Ultrafine Particles of Minerals |
| title_sort | features of measuring the hardness of a metal surface modified with ultrafine particles of minerals |
| topic | hardness metal surface vickers measurements industrial indentation mineral coatings |
| url | https://pimi.bntu.by/jour/article/view/665 |
| work_keys_str_mv | AT avskazochkin featuresofmeasuringthehardnessofametalsurfacemodifiedwithultrafineparticlesofminerals AT ggbondarenko featuresofmeasuringthehardnessofametalsurfacemodifiedwithultrafineparticlesofminerals AT pzukowski featuresofmeasuringthehardnessofametalsurfacemodifiedwithultrafineparticlesofminerals |