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Open AccessArticle

The Influence of the Depth of Cut in Single-Pass Grinding on the Microstructure and Properties of the C45 Steel Surface Layer

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Department of Materials Engineering and Bonding, Faculty of Mechanical Engineering, Gdańsk University of Technology, G. Narutowicza Str. 11/12, 80-233 Gdańsk, Poland
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Department of Manufacturing and Production Engineering, Faculty of Mechanical Engineering, Gdańsk University of Technology, G. Narutowicza Str. 11/12, 80-233 Gdańsk, Poland
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Department of Mechanics and Mechatronics, Faculty of Mechanical Engineering, Gdańsk University of Technology, G. Narutowicza Str. 11/12, 80-233 Gdańsk, Poland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(5), 1040; https://doi.org/10.3390/ma13051040
Received: 31 January 2020 / Revised: 20 February 2020 / Accepted: 21 February 2020 / Published: 26 February 2020
(This article belongs to the Section Structure Analysis and Characterization)
The paper contains the results of a metallographic examination and nanoindentation test conducted for the medium carbon structural steel with low content of Mn, Si, Cu, Cr, and Ni after its grinding to a depth ranging from 2 μm to 20 μm, at constant cutting speed (peripheral speed) of vs = 25 ms−1 and constant feed rate of vft = 1 m/min. Applied grinding parameters did not cause the surface layer hardening, which could generate an unfavorable stress distribution. The increase in the surface hardness was obtained due to the work hardening effect. Microstructure, phase composition, and chemical composition of the grinded surface layer were examined using an X-ray diffractometer, light microscope, and scanning microscope equipped with X-ray energy-dispersive spectroscopy, respectively. Hardness on the grinded surface and on the cross-section was also determined. It was shown that the grinding of C45 steel causes work hardening of its surface layer without phase transformation. What is more, only grinding to a depth of 20 μm caused the formation of an oxide scale on the work-hardened surface layer. Nanoindentation test on the cross-section, at a short distance from the grinded surface, has shown that ferrite grains were more susceptible to work hardening than pearlite grains due to the creation of an equiaxed cellular microstructure, and that different dislocation substructure was created in the work-hardened surface layer after grinding to different depths. View Full-Text
Keywords: single-pass surface grinding; medium carbon steel; indentation test; work hardening; surface layer single-pass surface grinding; medium carbon steel; indentation test; work hardening; surface layer
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Szkodo, M.; Chodnicka-Wszelak, K.; Deja, M.; Stanisławska, A.; Bartmański, M. The Influence of the Depth of Cut in Single-Pass Grinding on the Microstructure and Properties of the C45 Steel Surface Layer. Materials 2020, 13, 1040.

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