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Ironmaking
Название Analysis of methods for determination of cast iron hardness based on assessment of measurement accuracy
DOI 10.17580/chm.2024.07.05
Автор V. A. Ivanova, A. G. Panov
Информация об авторе

Yaroslavl State Technical University, Yaroslavl, Russia.

V. A. Ivanova, Dr. Eng., Associate Prof., Director of the Institute of Engineering and Machinery Manufacturing, e-mail: ivanovava@ystu.ru


Naberezhnye Chelny Institute, Kazan (Volga Region) Federal University, Naberezhnye Chelny, Russia
A. G. Panov, Dr. Eng., Prof., e-mail: panov.ag@mail.ru

Реферат

The paper concerns with the assessment of hardness measurements accuracy provided by standard methods. We performed hardness measurement by the Brinell method (GOST 9012-59), by the Rockwell method on the C scale (GOST 9013-59), and by the Vickers method (GOST 2999-75). The measurement by the Brinell method included a load of 250 kgf, a ball diameter of 5 mm, and an exposure time of 10 seconds. We used samples of alloyed cast iron with vermicular graphite with a uniform distribution and a high proportion of vermicular graphite after isothermal quenching. We provided the isothermal quenching at a temperature of 900 °C for 30 minutes under a layer of birch charcoal and cast iron chips, followed by quenching in a salt melt at a temperature of 290 °C with exposure for 30 minutes. The processing of the hardness measurement results was performed in accordance with GOST R 8.736-2011 “State system for ensuring the uniformity of measurements. Multiple direct measurements. Methods of measurement results processing. Main principles”. According to the assessment results, the Brinell hardness measurement method has the highest accuracy in measuring the hardness of cast iron with vermicular graphite. The Rockwell and Vickers hardness measurement methods have lower accuracy (test load 50 g). The Vickers measurement method has the lowest accuracy of hardness measurement of cast iron with vermicular graphite (test load 15 g). The larger phase inhomogeneity in the area of the print obtained by the Rockwell and Vickers hardness measurement methods compared to the Brinell method might explain the results.

Ключевые слова Assessment of measurement accuracy, hardness measurement, cast iron with vermicular graphite
Библиографический список

1. Ten E. B., Drokin A. S., Kaldybaeva S. T. Study of structure, phase compositions and heat-physical properties of high-alloyed iron with globular graphite. Chernye Metally. 2011. No. 5. pp. 9–12.
2. Abdullaev K. S., Bobodustov Z. M., Khudoiberdiev R. Kh. et al. The influence of heat treatment on the structure of wear-resistant cast iron. Vestnik nauki. 2020. No. 1 (22). pp. 135–139.
3. Kovalko M. S., Volochko A. G., Ziziko A. V., Rubanik V. V. Formation of structure and properties in high-strength cast iron during its isothermal hardening using ultrasonic. Lityo i metallurgiya. 2020. No. 4. pp. 118–124.
4. Polzin Т., Schwenk D. Method for uncertainty determination of hardness testing. Materialpruefung. 2002. Vol. 44, Iss. 3. pp. 64–71.
5. Shevchuk S. A., Zasetsky V. V. Measuring the hardness of cast iron castings using the Poldi device. Metallurgiya mashinostroeniya. 2009. No. 4. pp. 34–37.
6. Panov A. G., Shaehova I. F., Gurtovoy D. A. Effect of isothermal holding on the structure and microhardness of cast iron with vermicular graphite, hardened to upper bainite. Liteynoe proizvodstvo. 2021. No. 10. pp. 2–8.
7. Useinov A., Kravchuk K., Maslenikov I. Indentation. Measuring the hardness and crack resistance of coatings. Kontrol i izmereniya. 2013. No. 7/45. pp. 48–56.
8. Ramensky V. V., Filippov K. Yu. Comparative analysis of methods for hardness determination. Collection of proceedings of the VI International Scientific and Practical Conference “Current Issues of Aviation and Cosmonautics”, Krasnoyarsk, April 13–17, 2020. In 3 volumes. Volume 1. Krasnoyarsk : Reshetnev Siberian State University of Science and Technology, 2020. pp. 28–30.
9. Korchevsky V. V., Metlitskaya L. P., Rimlyand V. I. Measurement of microhardness at various stages of steel tempering. Vestnik Tikhookeanskogo gosudarstvennogo universiteta. 2014. No. 1(32). pp. 141–146.
10. Kanaev A., Moldakhmetova A., Kossanova I. Investigation of the surface layer of wheel steel by indentation method. Vestnik Evraziyskogo natsionalnogo universiteta imeni L. N. Gumileva. Seriya: Tekhnicheskie nauki i tekhnologii. 2023. No. 3(144). pp. 41–51.
11. Chikova O. A., Shishkina E. V., Petrova A. N., Brodova I. G. Measuring the hardness of submicrocrystalline industrial aluminum alloys obtained by dynamic pressing using the nanoindentation method. Fizika metallov i metallovedenie. 2014. Vol. 115. No. 5. pp. 523–528.
12. Mikhalchenkov A. M., Kiseleva L. S. Dispersion of microhardness values during plastic deformation of cast iron and steel. Nadezhnost i control kachestva. 1993. No. 2. pp. 44–47.
13. GOST 9012–59. Metals. Method of Brinell hardness measurement. Introduced: 01.01.1960.
14. GOST 9013–59. Metals. Method of measuring Rockwell hardness. Introduced: 01.01.1969.
15. GOST 2999–75. Metals and alloys. Vickers hardness test by diamond pyramid. Introduced: 01.07.1976.
16. GOST R 8.736–2011. State system for ensuring the uniformity of measurements. Multiple direct measurements. Methods of measurement results processing. Main principles. Introduced: 01.01.2013.

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