Portable Hardness Tester for Instrumental Indentation

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 componen...

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Bibliographic Details
Published in:Surface investigation, x-ray, synchrotron and neutron techniques x-ray, synchrotron and neutron techniques, 2020-07, Vol.14 (4), p.846-850
Main Authors: Gladkikh, E. V., Maslenikov, I. I., Reshetov, V. N., Useinov, A. S.
Format: Article
Language:English
Subjects:
Actuators
Aging (metallurgy)
Aluminum
Chemistry and Materials Science
Diameters
Diamonds
Fused silica
Hardness
Indentation
Materials Science
Modulus of elasticity
Nozzles
Particle board
Portable equipment
Railway tracks
Silicon dioxide
Surfaces and Interfaces
Thin Films
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Description
Summary: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.
ISSN:1027-4510
1819-7094
DOI:10.1134/S102745102003026X