Tribological behavior of low-alloyed steel after nitriding

Vicen, Martin; Bokůvka, Otakar; Nikolić, Ružica R.; Bronček, Jozef

doi:10.30657/pea.2020.26.16

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…Vicen et al [ 22 ] investigated the tribological properties of a nitride layer applied to a low-alloyed steel. The authors reported the results of the experimental work, which included determination of the chemical composition and wear resistance, and Rockwell, Vickers and nano-indentation tests, both of the substrate material—the low-alloyed steel—and the deposited nitride layer.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Welding Type and Filler Metal Influence on Performance of a Regenerated Gear

et al. 2021

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This paper presents the results of voluminous experimental investigations conducted to analyze the influence of the welding procedure on the performance of regenerated gears. Cylindrical spur gears were tested, both newly manufactured and regenerated, in two fundamentally different ways: by hard facing (surfacing) with the “hard” filler metal (DUR 600-IG) and with the “soft” filler metal (EVB2CrMo) with subsequent cementation and quenching. The regeneration procedures were defined and executed, while, subsequently, the microstructure and microhardness of the hard-faced layers were established and measured, followed by checking the durability of the hard-faced teeth flanks. Finally, techno-economic analysis was performed to establish the rationality of the conducted regenerations, i.e., the costs of regenerated and newly manufactured teeth were compared. Based on the results of the conducted investigations, it was possible to establish the influence of the welding type on the performance characteristics (primarily the service life) of the regenerated gears. For individual reparatory hard facing, the procedure with the “hard” filler metal exhibited better characteristics, while for batch reparation of numerous damaged gears, the reparation with the “soft” filler metal, followed by cementation and heat treatment, might be more convenient.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Welding Type and Filler Metal Influence on Performance of a Regenerated Gear

et al. 2021

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“…The tribological investigation was performed on model samples, prepared from the hard-faced surfaces, on a tribometer by the “block-on-disc” method, similar to some previous testing [ 30 , 31 ]. The samples were prepared in such a way to simulate the operation conditions of teeth of the coupled gears.…”

Section: Tribological Metallurgical and Hardness Investigationsmentioning

confidence: 99%

Exploitation Characteristics of Teeth Flanks of Gears Regenerated by Three Hard-Facing Procedures

et al. 2021

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Numerous phenomena that occur during the process of machine parts’ regeneration have a significant impact on the loss of their working ability. Therefore, the properties of the working surfaces of the teeth flanks of repaired gears were analyzed in this research. The hereditary properties of the gear teeth are expressed by the interdependence of their geometric and physical-mechanical-metallurgical parameters created during the technological operations of regeneration of worn teeth by welding/hard-facing. The hard-facing was executed with three filler metal types, namely: combination Inox 18/8/6 + EDur 600, Castolin 2 and UTP 670. The tested properties included geometrical accuracy, microstructure and microhardness. Evaluation of the executed regeneration procedures was done by comparing the mentioned parameters of the regenerated gears and the new ones. The tested gears were not withdrawn from production due to damage, but they were newly manufactured and intentionally damaged gears, made of the same materials, subjected to the same manufacturing process. In this way, all influences except for the considered filler metal type were eliminated. Based on results of the conducted experiments, it was possible to establish the influence of the filler metal type on the surface characteristics of the regenerated gears’ teeth flanks.

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“…Their conclusion was that the low-precision gear profile grade reduces the ability to detect faults, while the gears with high quality teeth surfaces allowed for detecting the smaller faults. (Vicen et al, 2020) investigated the tribological properties of a nitride layer applied to a low-alloyed steel. The authors' experimental work included determination of the chemical composition and wear resistance, as well as the Rockwell, Vickers and nano-indentation tests, both of the substrate material and the deposited layer.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Authors of this article have some experience on this subject (Lazić et al, 2009;Lazić et al, 2014;Lazić et al, 2016;Arsić et al, 2016a;Arsić et al, 2016b) and have pointed to possibility of using the reparation for restoring the damaged parts of various machine systems. Based on investigated literature one can conclude that a small number of researchers were considering influence of the regeneration procedure on tribological characteristics of regenerated gears, especially from the point of view of technological inheritance (Vicen et al, 2020). Various hard-facing methods and their application in the repara-tion process of gears were considered in authors' own investigations (Markovic et al, 2011;Markovic et al, 2013;Markovic et al, 2021), where results of experimental metallurgical investigations of the repaired gear teeth were analyzed (Mohammed et al, 2020;Vasić et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Influence of different hard-facing procedures on quality of surfaces of regenerated gears

Nikolić

Marković

Arsić

et al. 2021

Production Engineering Archives

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During the process of regeneration of machine parts, certain phenomena occur that have a significant impact on the loss of their working ability. Hereditary properties are expressed by the interdependence of geometric and physical-mechanical-metallurgical parameters of gear teeth created during the technological operations of regeneration of worn teeth by hard-facing. The influence of the type of additional material (electrodes and their combinations) on the tribological characteristics of welded gear teeth was considered, whereby the so-called hard additional materials were applied. Those are the additional materials that give the required surface hardness of the teeth without subsequent thermal or thermochemical treatment. This research did not involve the regeneration of specific worn gears removed from machine systems, but the new gears were made, which were then damaged and then regenerated by hard-facing using the shielded metal arc welding (SMAW) procedure. Thus, all the tested gears were made of the same material, belonged to one batch and were machined on the same machines with the same machining regimes. The tests were performed on samples made of 20MnCr5 steel for cementation, on a tribometer by the “block on disc” method, which was designed to simulate the operating conditions of coupled teeth of concrete gears in the exploitation conditions. Based on the conducted tribological tests, the average coefficients of friction and topography of the surfaces were determined by measuring the wear trace and it was defined which additional materials give the best tribological characteristics of the surfaces of gears regenerated by hard-facing.

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Tribological behavior of low-alloyed steel after nitriding

Cited by 9 publications

References 12 publications

Analysis of the Welding Type and Filler Metal Influence on Performance of a Regenerated Gear

Analysis of the Welding Type and Filler Metal Influence on Performance of a Regenerated Gear

Exploitation Characteristics of Teeth Flanks of Gears Regenerated by Three Hard-Facing Procedures

Influence of different hard-facing procedures on quality of surfaces of regenerated gears

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