Contribution to the Assessment of Thermal Shock Resistance of Metals

• Autorzy: Jakubus A. , Soiński M. S.

Identyfikatory

DOI

10.24425/afe.2020.133354

• Języki publikacji: EN

Abstrakty

EN

The study presents a concept of generation of micro-cracks (or cracks) in metal specimens in order to assess their material with respect to the thermal shock resistance. Both the method of conducting the experiment and the criteria of the assessment of the material resistance to the rapid temperature changes are discussed. The schematic diagram of the research stand used for repeated heating and rapid cooling of specimens, constructed in the Foundry Institute of the Częstochowa University of Technology, is presented. The proposed solution enables to maintain constant conditions of the experiment. The tests were held for flat specimens 70 mm long, 20 mm wide, and 5 mm thick, tapered over a distance of 15 mm towards both ends. The specimens were induction heated up to the specified temperature and then, in response to the signal produced by a pyrometer, dipped in the tank containing the cooling medium. The thermal shock resistance of the material can be assessed on the basis of either the total length of the micro-cracks arisen at the tapered parts of a specimen after a specified number of heating-and-cooling cycles, or the number of such cycles prior to the total damage of a specimen, or else the number of thermal cycles prior to generation of the first crack. The study includes an exemplary view of the metal specimen after the thermal shock resistance tests, as well as the illustrative microstructure of the vermicular cast iron which reveals a crack propagating from the edge towards the core of the material.

Słowa kluczowe

EN

resistance of metals; thermal shocks; research methodology; induction heating

PL

odporność metalu; szoki termiczne; metodologia badań; ogrzewanie indukcyjne

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2020
• Tom: Vol. 20, iss. 4
• Strony: 97--100
• Opis fizyczny: Bibliogr. 20 poz., fot., rys., wykr.

Twórcy

autor

Jakubus A.

• Jacob of Paradies University in Gorzów Wielkopolski, ul. Teatralna 25, 66-400 Gorzów Wielkopolski, Poland

autor

Soiński M. S.

• Jacob of Paradies University in Gorzów Wielkopolski, ul. Teatralna 25, 66-400 Gorzów Wielkopolski, Poland

Bibliografia

• [1] Krawczyk, J. (2008). Structural causes of defects in a cast iron mill roll. Archives of Foundry Engineering.8(2), 93-98.
• [2] Zych, J. & Wróbel, J. (2014). Influence of the selected factors on thermal fatigue of the adi in an aspect of its suitability as the material for metal moulds. Archives of Metallurgy and Materials. 59(2), 693-697.
• [3] Collinia, L., Pirondia, A., Bianchia R., et al. (2011). Influence of casting defects on fatigue crack initiation and fatigue limit of ductile cast iron. Procedia Engineering. 10, 2898-2903.
• [4] Zhan, J., Li, M., Huang, J., et al. (2019). Thermal Fatigue Characteristics of Type 309 Austenitic Stainless Steel for Automotive. Manifolds. Metals. Open Access Metallurgy Journal. 9(2), 129.
• [5] Gerla, A., Wałęga-Chwastek, H., Kalarus, A. (2011). Comparative tests of thermal shock resistance of magnesite material. Works of The Institute of Ceramics and Building Materials. Warsaw – Opole. Vol. 7, (pp. 37-53). (in Polish).
• [6] Podrzucki, C., Wojtysiak, A. (1988). Plastic non-alloy cast iron. Cracow: Part II, Ed. AGH. (in Polish).
• [7] Podrzucki, C. (1991). Cast iron. Structure, properties, applications, vol. 1 and 2. Cracow: Ed. ZG STOP. (in Polish).
• [8] Wang, Y., Charbal, A., Hild, F., et al. (2019). Crack initiation and propagation under thermal fatigue of austenitic stainless steel. International Journal of Fatigue, Elsevier. 124, 149-166.
• [9] Warmuzek, M. & Polkowska, A. (2020). Micromechanism of Damage of the Graphite Spheroid in the Nodular Cast Iron During Static Tensile Test. Jurnal od Manufacturing and Materials Processing. 4, 22.
• [10] Wojciechowski, A., Sobczak, J. (2001). Composite brake discs of road vehicles. Warsaw: Motor Transport Institute. (in Polish).
• [11] http://www.instron.us/. 28.02.2016r. godz. 13.10.
• [12] Grochal, T., Jaśkowiec, K., Pytel, A. (2012). A device to test the thermal fatigue of metallic materials. Modern materials resistant to thermal fatigue. Part 1. General problems. Institute of Foundry, Cracow (pp. 98-108). (in Polish).
• [13] Weroński, A. (1983). Thermal fatigue of metals. Warsaw, Ed. WNT, (in Polish).
• [14] Zych, J., Wróbel, J. (2010). Influence of thermal fatigue of ductile iron GJS (Ni1,5MoCu) - base for producing ADI – on structure and tensile sterngth. Archives of Foundry Engineering. 10(spec.2), 177 -181.
• [15] Maj, M. (2011). Application of modified low-cycle fatigue test in studies of inoculated cast iron. Archives of Foundry Engineering. 11(spec.4), 83-86.
• [16] Qiu, Y., Pang, J.C., Zhang, M.X. et al. (2018). Influence of temperature on the high-cycle fatigue properties of compacted graphite iron. International Journal of Fatigue. 112, 84-93.
• [17] Jakubus, A., The influence of austempering treatment on the wear resistance and the thermal shock resistance of vermicular cast iron. Doctoral thesis. Częstochowa 2016. (in Polish).
• [18] Jakubus, A. & Soiński, M.S. (2018). Thermal shock resistance of cast iron with various shapes of graphite precipitates. Archives of Foundry Engineering. 18(2), 121-124.
• [19] Stradomski, G., Gzik, S., Jakubus, A. & Nadolski, M. (2018). The assessment of resistance to thermal fatigue and thermal shock of cast iron used for glass moulds. Archives of Foundry Engineering. 18(3), 173-178.
• [20] Stradomski, G., Krupop, M., Jakubus, A., Nadolski, M. (2018). The resistance of thermal shock of the 21crmov5-7 steel. Metal 2018 May 23rd -25th, Brno, Czech Republic, EU.