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<p>The article presents the results of studies aimed at ensuring the uniformity of Vickers and Knoop hardness measurements. The components of random and systematic error in reproducing Vickers hardness numbers within the range of 2000–5000 HV and Knoop hardness numbers within the range of 17–2500 HK are estimated. This study is prompted by the fact that the hardness of ceramic materials used in industry and medicine is greater than 2000 HV, and the Vickers hardness measurements of products made of these ceramic materials were not traceable to the GET 31-2010 State primary special standard for Vickers metal hardness. In addition, the Vickers diamond forms a&#xa0;square indentation, so when hardness is measured on a&#xa0;limited surface area, for example, near a&#xa0;welded joint, one of the corners of the indentation goes beyond the boundaries of the measurement area, which leads to incorrect hardness estimation of the surface area under study. The Knoop method, implemented with the use of a&#xa0;pyramidal diamond leaving an indentation in the shape of a&#xa0;stretched rhombus, solves the problem of correct hardness estimation on a&#xa0;limited surface area. A&#xa0;standard system enabling the reproduction of Vickers hardness numbers within the range of 2000–5000 HV and Knoop hardness numbers within the range of 17–2500 HK was developed and included into GET 31-2024 State primary standard hardness machine for Vickers and Knoop scales. Thus, traceability to GET 31-2024 was ensured for measurement results obtained with the use of hardness testers. The metrological characteristics of GET 31-2024 were analyzed. The use of hardness testers traceable to GET 31-2024 provides a&#xa0;means to accurately evaluate the mechanical properties of new materials, predict the performance characteristics of products made of new materials, and improve the reliability of hardness control.</p>

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GET 31-2024 State primary standard hardness machine for Vickers and Knoop scales

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Andrey E. Aslanyan,
  • Edward G. Aslanyan,
  • Demyan N. Pilipenko,
  • Vladimir V. Shvydun,
  • Andrey N. Shchipunov,
  • Lev V. Yurov

摘要

The article presents the results of studies aimed at ensuring the uniformity of Vickers and Knoop hardness measurements. The components of random and systematic error in reproducing Vickers hardness numbers within the range of 2000–5000 HV and Knoop hardness numbers within the range of 17–2500 HK are estimated. This study is prompted by the fact that the hardness of ceramic materials used in industry and medicine is greater than 2000 HV, and the Vickers hardness measurements of products made of these ceramic materials were not traceable to the GET 31-2010 State primary special standard for Vickers metal hardness. In addition, the Vickers diamond forms a square indentation, so when hardness is measured on a limited surface area, for example, near a welded joint, one of the corners of the indentation goes beyond the boundaries of the measurement area, which leads to incorrect hardness estimation of the surface area under study. The Knoop method, implemented with the use of a pyramidal diamond leaving an indentation in the shape of a stretched rhombus, solves the problem of correct hardness estimation on a limited surface area. A standard system enabling the reproduction of Vickers hardness numbers within the range of 2000–5000 HV and Knoop hardness numbers within the range of 17–2500 HK was developed and included into GET 31-2024 State primary standard hardness machine for Vickers and Knoop scales. Thus, traceability to GET 31-2024 was ensured for measurement results obtained with the use of hardness testers. The metrological characteristics of GET 31-2024 were analyzed. The use of hardness testers traceable to GET 31-2024 provides a means to accurately evaluate the mechanical properties of new materials, predict the performance characteristics of products made of new materials, and improve the reliability of hardness control.