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High-temperature sliding wear behaviour of Stellite®12 and Tribaloy®T400
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.ORCID-id: 0000-0003-1454-1118
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.ORCID-id: 0000-0003-1162-4671
Märkisches Werk GmbH, Research & Development Department, Halver 58553, Germany.
2018 (Engelska)Ingår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 402-403, s. 148-159Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this work, the sliding wear behaviour of the hardfacing alloys Stellite®12 and Tribaloy®T400 during interaction with a CrMo-steel is investigated at elevated temperatures. These materials are typically used for gas exchange valves and seat rings in large bore gas engines where they are subjected to severe operating conditions. The clean combustion and a decreased oil flow towards the tribosystem valve spindle/seat ring in the natural gas-fuelled engines cause excessive wear when operating at high combustion pressures and elevated temperatures.

Commonly employed Co-based alloys for the valve seating faces show a vast variation in their wear behaviour when the high tribological loads act directly on the contact surfaces which are not protected by any type of tribofilm. In order to understand the mechanisms under unlubricated and metal-to-metal contact situation, reciprocating pin-on-disc sliding wear tests were carried out at high temperatures for the two common material combinations, mentioned above. The effects of temperature, initial hardfacing roughness, microstructure, and hardness on the friction and wear response are investigated. The quantitative wear results in combination with microstructural and wear mechanism analysis provide the foundation for a phenomenological description of the wear behaviour. The tendency to form oxides has been found to be a decisive factor in terms of the severity of wear of the investigated hardfacings. Stellite®12 shows low surface oxidation at elevated temperatures whereas the intermetallic phases in Tribaloy®T400 oxidize significantly.

Ort, förlag, år, upplaga, sidor
Elsevier, 2018. Vol. 402-403, s. 148-159
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement
Identifikatorer
URN: urn:nbn:se:ltu:diva-67666DOI: 10.1016/j.wear.2018.02.013ISI: 000429077100016Scopus ID: 2-s2.0-85042387383OAI: oai:DiVA.org:ltu-67666DiVA, id: diva2:1182900
Anmärkning

Validerad;2018;Nivå 2;2018-03-05 (svasva)

Tillgänglig från: 2018-02-15 Skapad: 2018-02-15 Senast uppdaterad: 2018-04-26Bibliografiskt granskad

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Renz, AlexanderPrakash, BrahamHardell, Jens
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