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Metals 2017, 7(4), 139; doi:10.3390/met7040139

Tribological Properties of Plough Shares Made of Pearlitic and Martensitic Steels

1
Department of Agrotechnical Systems Engineering, Faculty of Environmental Management and Agriculture, West Pomeranian University of Technology, Papieża Pawła VI Street 1, 71-459 Szczecin, Poland
2
Welding and Strength of Materials, Department of Materials Science, Faculty of Mechanical Engineering, Wroclaw University of Technology, Smoluchowskiego Street 25, 50-370 Wrocław, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Robert Tuttle
Received: 11 March 2017 / Revised: 5 April 2017 / Accepted: 11 April 2017 / Published: 14 April 2017
(This article belongs to the Special Issue Alloy Steels)
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Abstract

Tribological properties of ploughshares made of pearlitic and martensitic steels were compared in field tests. Sectional ploughshares consisting of separate share-points and trapezoidal parts were subjected to examinations. Contours of the examined parts were similar, but the thickness of the parts made of pearlitic steel was 1 to 3 mm greater for the share-points and 0.5 to 2 mm greater for the trapezoidal parts. Within the tests, sandy loams, loams, and loamy sands with circa (ca.) 13% humidity were cultivated. A greater intensity of thickness reduction and mass wear of the parts made of pearlitic steel was found, which indicates a lower resistance of this steel to wear in soil. However, contour changes of the share-points and the trapezoidal parts made of pearlitic and martensitic steels were comparable, which was probably influenced by the greater thickness of the parts made of pearlitic steel. The roughness of the rake faces of the parts made of pearlitic steel was greater than that for the parts made of martensitic steel, which can be attributed to lower hardness of the former. The largest differences occurred between maximum peak heights of the roughness profile values (Rp), which indicates stronger ridging in the case of pearlitic steel. Scanning electron microscope (SEM) observations of the rake faces showed that martensitic steel was subjected to wear mostly by microcutting, but pearlitic steel was principally worn by microcutting and microploughing. During tillage, only one share-point made of pearlitic steel was broken. However, the main disadvantage of these parts was that their bending was related to the lower mechanical strength of pearlitic steel. View Full-Text
Keywords: plowshares; wear; durability; martensitic steel; pearlitic steel plowshares; wear; durability; martensitic steel; pearlitic steel
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Stawicki, T.; Białobrzeska, B.; Kostencki, P. Tribological Properties of Plough Shares Made of Pearlitic and Martensitic Steels. Metals 2017, 7, 139.

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