Investigation and analysis of the possibility of diffusionless phase transformations in the surface layer of a part under the action of grinding temperatures

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.140982

Keywords:

austenite, martensite, γ-iron, α-iron, heating rate, transformation temperature, martensite range, surface layer, critical temperature

Abstract

The possibility of diffusionless phase transformations in the surface layer of the ground part under the influence of instantaneous grinding temperature is investigated and analyzed. This is important because the phase Feα-Feγ transformations that may occur when grinding parts lead to the appearance of so-called grinding burns, which 2-3 times reduce the reliability and durability of the part in the working mechanism. The mechanism of phase transformations, the critical temperature of these transformations and the associated processing modes that provide this temperature are determined. This allows a reasonable approach to the definition of grinding modes and, if necessary, the application of the cooling method. In addition, the problem of optimizing grinding regimes can be solved if the processing performance is taken as a target function, and grinding temperature as a limitation. With rapid surface heating of the hardened steel part by the grinding temperature above the Ac1 line, there is a reverse martensitic transformation Feα→Feγ. The martensite range during cooling Mn-Mk to a large extent covers negative temperatures. Therefore, austenite is partially fixed in the surface layer, forming a so-called quenching burn. Dependences for determining the formation temperature for steel of any chemical composition, give the possibility to maintain the value of grinding temperature below this level during grinding. The mechanism of diffusionless reverse martensitic transformation in the high-speed surface heating by cutting grains (instantaneous temperature) is considered. The heating rate and the effect of the pressure produced by the abrasive grain on the metal during the chip removal are experimentally determined. Thus, the possibility of diffusionless phase transformation is substantiated and the dependences for the calculation of austenite formation temperatures are given, which in turn provides the opportunity to calculate safe processing regimes

Author Biographies

Ala Bezpalova, Odessa State Academy of Civil Engineering and Architecture Didrihsona str., 4, Odessa, Ukraine, 65029

PhD, Associate Professor

Department of Organization of construction and labor protection

Vladimir Lebedev, Odessa National Polytechnic University Shevchenka аve., 1, Odessa, Ukraine, 65044

Doctor of Technical Sciences, Professor

Department of technology of structural materials and materials science

Natalia Klimenko, Odessa National Polytechnic University Shevchenka аve., 1, Odessa, Ukraine, 65044

PhD, Associate Professor

Department of technology of structural materials and materials science

Tatiana Chumachenko, Odessa National Polytechnic University Shevchenka аve., 1, Odessa, Ukraine, 65044

PhD, Associate Professor

Department of technology of structural materials and materials science

Inga Uryadnikova, National University of Physical Education and Sport of Ukraine Fizkultury str., 1, Kyiv, Ukraine, 03150

PhD, Associate Professor

Department of Sports Medicine

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Published

2018-08-27

How to Cite

Bezpalova, A., Lebedev, V., Klimenko, N., Chumachenko, T., & Uryadnikova, I. (2018). Investigation and analysis of the possibility of diffusionless phase transformations in the surface layer of a part under the action of grinding temperatures. Eastern-European Journal of Enterprise Technologies, 4(12 (94), 36–42. https://doi.org/10.15587/1729-4061.2018.140982

Issue

Vol. 4 No. 12 (94) (2018): Materials Science

Section

Materials Science

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Copyright (c) 2018 Ala Bezpalova, Vladimir Lebedev, Natalia Klimenko, Tatiana Chumachenko, Inga Uryadnikova

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