Establishing of Rolling - Friction Coefficient, for Hertzian Contacts Between Steel Balls and Different Kinds of Thermochemical Treated Steel Surfaces
It is known that for the ball displacement guide paths, the necessary startmoving force of the mobile half-couple is higher than the displacement-motion keeps force.Within the frame of this work, it has been designed and manufactured special pairs of rolling-motion couples, made from 5115AISI case-h...
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| Format: | Article |
| Language: | English |
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Galati University Press
2005-11-01
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| Series: | The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science |
| Subjects: | |
| Online Access: | https://www.gup.ugal.ro/ugaljournals/index.php/mms/article/view/3249 |
| _version_ | 1819280031374901248 |
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| author | Daniel MUNTEANU |
| author_facet | Daniel MUNTEANU |
| author_sort | Daniel MUNTEANU |
| collection | DOAJ |
| description | It is known that for the ball displacement guide paths, the necessary startmoving force of the mobile half-couple is higher than the displacement-motion keeps force.Within the frame of this work, it has been designed and manufactured special pairs of rolling-motion couples, made from 5115AISI case-hardening steel and 4140 AISI heat treatable steel. After that, some of them (in the first blend) were carburized (at 925 oC) and others carbonitrided (at 890 oC) in gaseous conditions. The rolling - friction tests supposed different arrangements of the half-couples and balls. In order to establish the rolling - friction coefficients for all the thermochemical treated surfaces, a typical method such as the inclined plane slope, was used. Taking into account each kind of superficial treatment category, generally, it has been observed smaller values of equivalent friction coefficient for the carburized surfaces in comparison with the carbonitrided ones. For low - temperature superficial treatments category, a little bit smaller values of equivalent friction coefficient for the nitocarburized surfaces in comparison with the nitrided ones were obtained. The non-treated surfaces have been characterized, in all the cases, by minimum friction coefficient values in comparison with the treated ones. In comparison, the results clearly show a difference between the equivalent friction coefficient values registered for carburized/carbonitrided and nitrided/nitrocarburized surfaces. Thus, in the first case, these values were smaller than in the second case. |
| first_indexed | 2024-12-24T00:37:20Z |
| format | Article |
| id | doaj.art-a93690998c114cae83019e58f724d51b |
| institution | Directory Open Access Journal |
| issn | 2668-4748 2668-4756 |
| language | English |
| last_indexed | 2024-12-24T00:37:20Z |
| publishDate | 2005-11-01 |
| publisher | Galati University Press |
| record_format | Article |
| series | The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science |
| spelling | doaj.art-a93690998c114cae83019e58f724d51b2022-12-21T17:24:03ZengGalati University PressThe Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science2668-47482668-47562005-11-012823249Establishing of Rolling - Friction Coefficient, for Hertzian Contacts Between Steel Balls and Different Kinds of Thermochemical Treated Steel SurfacesDaniel MUNTEANU0Transilvania University of Brasov, RomaniaIt is known that for the ball displacement guide paths, the necessary startmoving force of the mobile half-couple is higher than the displacement-motion keeps force.Within the frame of this work, it has been designed and manufactured special pairs of rolling-motion couples, made from 5115AISI case-hardening steel and 4140 AISI heat treatable steel. After that, some of them (in the first blend) were carburized (at 925 oC) and others carbonitrided (at 890 oC) in gaseous conditions. The rolling - friction tests supposed different arrangements of the half-couples and balls. In order to establish the rolling - friction coefficients for all the thermochemical treated surfaces, a typical method such as the inclined plane slope, was used. Taking into account each kind of superficial treatment category, generally, it has been observed smaller values of equivalent friction coefficient for the carburized surfaces in comparison with the carbonitrided ones. For low - temperature superficial treatments category, a little bit smaller values of equivalent friction coefficient for the nitocarburized surfaces in comparison with the nitrided ones were obtained. The non-treated surfaces have been characterized, in all the cases, by minimum friction coefficient values in comparison with the treated ones. In comparison, the results clearly show a difference between the equivalent friction coefficient values registered for carburized/carbonitrided and nitrided/nitrocarburized surfaces. Thus, in the first case, these values were smaller than in the second case.https://www.gup.ugal.ro/ugaljournals/index.php/mms/article/view/3249SteelCarburizingNitridingRolling-friction coefficient |
| spellingShingle | Daniel MUNTEANU Establishing of Rolling - Friction Coefficient, for Hertzian Contacts Between Steel Balls and Different Kinds of Thermochemical Treated Steel Surfaces The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science Steel Carburizing Nitriding Rolling-friction coefficient |
| title | Establishing of Rolling - Friction Coefficient, for Hertzian Contacts Between Steel Balls and Different Kinds of Thermochemical Treated Steel Surfaces |
| title_full | Establishing of Rolling - Friction Coefficient, for Hertzian Contacts Between Steel Balls and Different Kinds of Thermochemical Treated Steel Surfaces |
| title_fullStr | Establishing of Rolling - Friction Coefficient, for Hertzian Contacts Between Steel Balls and Different Kinds of Thermochemical Treated Steel Surfaces |
| title_full_unstemmed | Establishing of Rolling - Friction Coefficient, for Hertzian Contacts Between Steel Balls and Different Kinds of Thermochemical Treated Steel Surfaces |
| title_short | Establishing of Rolling - Friction Coefficient, for Hertzian Contacts Between Steel Balls and Different Kinds of Thermochemical Treated Steel Surfaces |
| title_sort | establishing of rolling friction coefficient for hertzian contacts between steel balls and different kinds of thermochemical treated steel surfaces |
| topic | Steel Carburizing Nitriding Rolling-friction coefficient |
| url | https://www.gup.ugal.ro/ugaljournals/index.php/mms/article/view/3249 |
| work_keys_str_mv | AT danielmunteanu establishingofrollingfrictioncoefficientforhertziancontactsbetweensteelballsanddifferentkindsofthermochemicaltreatedsteelsurfaces |