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An experimental study on wear transitons in the wheel-rail contact
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2007. , 25 p.
Series
Trita-MMK, ISSN 1400-1179 ; 2007:02
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-4389OAI: oai:DiVA.org:kth-4389DiVA: diva2:12088
Presentation
2007-04-23, Rum M37, KTH, Brinellvägen 64, Stockholm, 13:15
Opponent
Supervisors
Note
QC 20101118Available from: 2007-05-22 Created: 2007-05-22 Last updated: 2012-01-27Bibliographically approved
List of papers
1. Influence of surface topography and surface modifications on seizure initiation in lean lubricated sliding contacts
Open this publication in new window or tab >>Influence of surface topography and surface modifications on seizure initiation in lean lubricated sliding contacts
2007 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 262, 986-995 p.Article in journal (Refereed) Published
Abstract [en]

Seizure initiation in lean-lubricated contacts was experimentally studied using a transient test method of ball-on-disc type at two different sliding velocities, 2 and 3.8 m/s. Four different nodular cast iron surfaces were tested against a bearing ball of 100Cr6 steel: a fine-milled and roller-burnished surface, a ground and lapped surface, a ground and lapped laser-melted surface, and finally a ground surface. The results show that the ground surface, even though it is smoother than the fine-milled and roller-burn i shed surface, shows indications of seizure at a lower load. No graphite nodules from the nodular cast iron were visible in the surfaces on inspection with an optical light microscope. In contrast, the ground and lapped surface suffered no initial or total seizure in these tests. In this case, many graphite nodules were visible in the surface, and these nodules became detached in the contact zone, where they probably acted as a solid lubricant. Many graphite nodules were also visible in the ground and laser-melted surface, though in this case the graphite nodules did not become detached. This surface topography initiated seizure under a low normal load, and increased sliding velocity lowered the total seizure load significantly.

Keyword
seizure, surface topography, sliding velocity, lubrication, nodular cast iron
National Category
Reliability and Maintenance
Identifiers
urn:nbn:se:kth:diva-11577 (URN)10.1016/j.wear.2006.10.014 (DOI)000245063500026 ()2-s2.0-33847060484 (Scopus ID)
Note
QC 20100721Available from: 2009-11-20 Created: 2009-11-20 Last updated: 2017-12-12Bibliographically approved
2. Seizure mechanisms of wheel–rail contacts under lubricated conditions using a transient ball-on-disc test method
Open this publication in new window or tab >>Seizure mechanisms of wheel–rail contacts under lubricated conditions using a transient ball-on-disc test method
2008 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 41, 867-874 p.Article in journal (Refereed) Published
Abstract [en]

This study focuses on the transition from mild to severe wear in the wheel and rail contact. Such a transition has been observed at increased loading (normal load, sliding velocity, or bulk temperature) which can be compared to a change from a wheel thread-rail head contact to a wheel flange-rail gauge contact. This transition was experimentally studied using a transient test method of ball-on-disc type at different sliding velocities, contact pressures, and lubricants. It can be seen in the results that different seizure mechanisms are active for different sliding velocities. Also the amount of applied lubricant clearly affects the transition to seizure.

Keyword
rail, wheel, seizure, lubrication
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:kth:diva-11580 (URN)10.1016/j.triboint.2007.12.011 (DOI)000257736800008 ()2-s2.0-44749093034 (Scopus ID)
Note
QC 20100721Available from: 2009-11-20 Created: 2009-11-20 Last updated: 2017-12-12Bibliographically approved
3. Seizure and wear rate testing of wheel–rail contacts under lubricated conditions using pin-on-disc methodology
Open this publication in new window or tab >>Seizure and wear rate testing of wheel–rail contacts under lubricated conditions using pin-on-disc methodology
2008 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, 1425-1430 p.Article in journal (Refereed) Published
Abstract [en]

An increased wear rate and a shift of wear mechanism in the wheel-rail contact has been observed in tight curves, mainly due to the change from an almost pure rolling contact to more of a sliding contact. The wheel flange-rail gauge contact is commonly known to experience the toughest conditions of the overall wheel-rail contact in terms of contact pressure and sliding velocity. The wheel flange-rail gauge contact is preferably lubricated to reduce the wear rate and to minimise the risk of transition to severe wear or seizure. The amount and type of lubrication are therefore important parameters if one is to control the wear rate. In this study, a flange contact is experimentally simulated using pin-on-disc testing, to determine the difference in wear rate among a selection of lubricants under different contact conditions. The selection of lubricants consisted of environmentally adapted oils, mineral oils, and greases containing different amounts of EP and AW additives.The results of the pin-on-disc testing indicate that both the amount and type of lubrication applied is decisive for the wear rate and active wear mechanism. Tests have also been performed to simulate either on-board or wayside lubrication, by applying the lubricant at different intervals. A general observation is that under starved lubrication conditions a transition to severe wear is initiated and the wear rate increases rapidly, i.e., all tests indicate that the contact between wheel and rail must be lubricated to avoid high wear rates.

Keyword
rail; wheel; wear rate; environmentally adapted; lubrication
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:kth:diva-11581 (URN)10.1016/j.wear.2008.03.025 (DOI)000258891700035 ()2-s2.0-48049117761 (Scopus ID)
Note
QC 20100721Available from: 2009-11-20 Created: 2009-11-20 Last updated: 2017-12-12Bibliographically approved

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