Abstract
High heating rates generally characterize the thermal grinding process. Thus, during grinding, secondary surface heat treatment is observed. Notably, that the technology does not provide for this secondary heat treatment, and its modes in most cases are such that they lead to violations of the phase and structural composition of the surface layer or the so-called grinding burns of hardening and tempering. Burns lead to cracks in the surface layer of the part and reduce the reliability and durability by 3–4 times. Tempering burns occur at lower temperatures than hardening burns. Therefore they are more common. It is shown that the temperature of tempering burns is the temperature of the third transformation of tempering, and the value of this temperature depends on the chemical composition of the ground steel and the heating rate. The study made it possible to obtain mathematical dependences for determining the temperature of the tempering burns (the temperature of the third transformation of the tempering). In this work, tables of temperatures of tempering burns have been created for hypoeutectoid, eutectoid, and hypereutectoid steels at different heating rates. It is shown that the grinding modes should provide lower temperatures. The presented material shows that the temperatures of the third transformation of tempering strongly depend on the content of carbide-forming elements, particularly on the concentration of chromium.
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Lebedev, V., Chumachenko, T., Klymenko, N., Frolenkova, O. (2022). Burns of Tempering While Grinding Hardened Steels. In: Tonkonogyi, V., Ivanov, V., Trojanowska, J., Oborskyi, G., Pavlenko, I. (eds) Advanced Manufacturing Processes III. InterPartner 2021. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-91327-4_18
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DOI: https://doi.org/10.1007/978-3-030-91327-4_18
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