NANOHARDNESS AS A MODERN METHOD OF DIAGNOSTICS OF PRODUCTS SURFACE LAYER QUALITY

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

Related Articles

СОДЕРЖАНИЕ И СТРУКТУРА МОДЕЛИРОВАНИЯ ПРОЦЕССА ЭКСПЛУАТАЦИИ МОСТОВЫХ СООРУЖЕНИЙ

При анализе фактической ситуации, возникающей при эксплуатации мостовых сооружений, ситуация «как есть» является исходной моделью для моделирования состояния «как должно быть». В соответствии с выбранными целями определя...

АНАЛІЗ КОЕФІЦІЄНТІВ ПОЗДОВЖНЬОГО ЗГИНУ З УРАХУВАННЯМ МІЦНОСТІ СТАЛІ

Проведено дослідження стійкості стальних стиснутих елементів конструкцій та деталей машин, проаналізовано експериментальні дані про роботу цих елементів та теоретичні розробки щодо їх розрахунків, побудувано графіки коеф...

[b]НОЖОВО-ФРЕЗЕРНИЙ БЕЗТРАНШЕЙНИЙ УКЛАДАЧ ТРУБ [/b]

Представлено нову конструкцію ножово-фрезерного безтраншейного укладача труб, який технологічно забезпечує високий коефіцієнт передачі тепла в масив, аналіз стану і напрямів досліджень для його реалізації. 

INFLUENCE OF RUBBER CRUMB ON THE PROPERTIES OF BITUM AND ASPHALT CONCRETE

The results of influence of finely dispersed rubber crumb on the properties of petroleum bitumen and asphalt concrete are presented in the study. The parameters of the optimal regime of bitu-men and rubber crumb mixing a...

ПРОБЛЕМНІ ПИТАННЯ ВИЗНАЧЕННЯ ПАРАМЕТРІВ РУХУ ТРАНСПОРТНИХ ЗАСОБІВ ПРИ ДОСЛІДЖЕННІ ДТП

Розглянуто проблематику дослідження процесу руху транспортного засобу після дорожньо-транспортної пригоди. Проаналізовано недоліки у визначенні параметрів ефективності гальмування транспортного засобу розрахунковим шляхо...

Download PDF file
  • EP ID EP480237
  • DOI 10.30977/BUL.2219-5548.2018.82.0.114
  • Views 65
  • Downloads 0

How To Cite

V. I. Moschenok, N. O. Lalazarova, І. Е. Kukharevа, S. V. Ponikarovska (2018). NANOHARDNESS AS A MODERN METHOD OF DIAGNOSTICS OF PRODUCTS SURFACE LAYER QUALITY. Вестник Харьковского национального автомобильно-дорожного университета, 82(), 114-118. https://europub.co.uk/articles/-A-480237