Life of Boride Coatings on Steels Under Cyclic Contact Load

The paper presents the results of studying the contact endurance and wear resistance of boride coatings, which were deposited on the 40Kh and ShKh15 steels by chemical heat treatment from boron-containing powders and with the addition of copper. The wear kinetics and mechanism of boride coatings in...

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Bibliographic Details
Published in:Strength of materials 2021-03, Vol.53 (2), p.291-296
Main Authors: Kaplun, P. V., Lyashenko, B. A., Rudyk, O. Yu, Gonchar, V. A.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromium steels
Classical Mechanics
Coatings
Comparative analysis
Contact pressure
Copper
Crack propagation
Cyclic loads
Heat treatment
Lubricants
Lubrication and lubricants
Materials Science
Point contact
Protective coatings
Rolling resistance
Solid Mechanics
Substrates
Wear mechanisms
Wear resistance
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Summary:The paper presents the results of studying the contact endurance and wear resistance of boride coatings, which were deposited on the 40Kh and ShKh15 steels by chemical heat treatment from boron-containing powders and with the addition of copper. The wear kinetics and mechanism of boride coatings in the I-20 lubricant at a pressure of 2140 MPa on the contact area during rolling friction with point contact have been studied. It has been found that the presence of copper in boride coatings increases by a factor of 1.5 their crack resistance compared with those without copper, which favorably affects the life of the coating/substrate composition under cyclic contact load. The life of specimens with boride coatings on steels under rolling friction up to the occurrence of pitting under certain test conditions has been determined. It is shown that the lives of the ShKh15 and 40Kh steels with boride coatings in the presence of copper are 1.9 and 2.4 times longer, respectively, than those of uncoated hardened steels.
ISSN:0039-2316
1573-9325
DOI:10.1007/s11223-021-00288-w