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Portable Hardness Tester for Instrumental Indentation

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Abstract

An instrument capable of assessing the hardness of materials by instrumental indentation under industrial-production conditions, including pipelines and parts of working mechanisms (bridges, railroad tracks, ship mechanisms, and other products), which operate outdoors, is described. The key components of the device are: a load-applying element (electromagnetic actuator), a displacement sensor (a capacitive sensor mounted on the working rod) and an indenter (a Berkovich diamond tip with a diameter of 500 μm and a radius of 100 nm). The largest force that can be applied to the sample is 10 N, and the maximum movement of the indenter reaches 150 μm. For the convenience of measuring both bulk and thin samples, a portable hardness tester is equipped with two different nozzles. The main peculiar feature of the device is measurement of the hardness and the Young’s modulus of the material within a single working cycle. The device is tested on various materials: steels of grades 40Cr13 and 08Cr18N10T (including samples that underwent aging), aluminum, fused silica, polycarbonate, and laminated chipboard. The roughness of the tested surfaces and the range of loads required to carry out instrumental indentation with a portable device are determined as well. The values of the hardness and elastic modulus are consistent with data obtained by means of laboratory hardness testers.

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Funding

This work was supported by the Ministry of Education and Science of the Russian Federation within the framework of the subsidy agreement no. 14.577.21.0274 (EB no. 075-15-2019-024, unique identifier of the project RFMEFI57717X0274).

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Authors and Affiliations

  1. Moscow Institute of Physics and Technology (National Research University), 141701, Dolgoprudny, Moscow oblast, Russia

    E. V. Gladkikh

  2. Technological Institute of Superhard and New Carbon Materials, 108840, Troitsk, Moscow oblast, Russia

    E. V. Gladkikh, I. I. Maslenikov & A. S. Useinov

  3. National Research Nuclear University MEPhI, 115409, Moscow, Russia

    V. N. Reshetov

Authors
  1. E. V. Gladkikh
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  2. I. I. Maslenikov
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  3. V. N. Reshetov
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  4. A. S. Useinov
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Correspondence to E. V. Gladkikh.

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Translated by O. Maslova

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Gladkikh, E.V., Maslenikov, I.I., Reshetov, V.N. et al. Portable Hardness Tester for Instrumental Indentation. J. Surf. Investig. 14, 846–850 (2020). https://doi.org/10.1134/S102745102003026X

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  • DOI: https://doi.org/10.1134/S102745102003026X

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