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Oxidation behavior of TI-6Al-4V alloy exposed to isothermal and cyclic thermal treatments
Universitat Politècnica de Catalunya, CIEFMA/EEBE, Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Universitat Politècnica de Catalunya, Barcelona, Spain.
Universitat Politècnica de Catalunya, CIEFMA/EEBE, Departament de Ciència dels Materials i Enginyeria Metallúrgica, Barcelona, Spain.
Universitat Politècnica de Catalunya, CIEFMA/EEBE, Departament de Ciència dels Materials i Enginyeria Metallúrgica, Barcelona, Spain, Luleå University of Technology, Division of Materials Science, S-97187 Luleå, Sweden.
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för svetsteknologi (SV). (PTW)ORCID-id: 0000-0002-7675-7152
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2017 (Engelska)Ingår i: Proceedings of the conference METAL 2017, TANGER Ltd. , 2017, s. 1573-1579Konferensbidrag, Muntlig presentation med publicerat abstract (Övrigt vetenskapligt)
Abstract [en]

One of the most common titanium alloys for aerospace industry is Ti-6Al-4V (usually designed as Ti-64) which is used for manufacturing aero-engine components, such as fan discs, compressor discs, blades andstators. The maximum service temperature for this alloy is limited partly because of degradation of mechanical properties at elevated temperatures (above 480 ºC). During the first stage of oxidation the oxidescale is protective, whereas after prolonged oxidation time it loses its protective nature and favours higher diffusion of oxygen through the oxide. In the present study, cyclic thermal treatments were performed in air at 500 and 700 ºC, up to 500 hours, and compared with similar studies carried out on isothermal oxidation conditions. The evolution of the surface oxidation was analyzed by metallographic techniques and X-ray diffraction, together with a detailed advanced characterization of the microstructure by Scanning Electron Microscopy and Focus Ions Beam. The results point out that the cyclic thermal treatments induced a strong increase of the weight gain compared to isothermal treatments. The analysis of the oxide scale revealed not only the presence of rutile, at 700 ºC, but also anatase and TiOx at 500 ºC for both isothermal and cyclic thermal treatments. At 700 ºC, thermal stress caused by cyclic thermal treatments promoted the fracture of the oxide after the first 20 hours.

Ort, förlag, år, upplaga, sidor
TANGER Ltd. , 2017. s. 1573-1579
Nyckelord [en]
Titanium, oxidation, isothermal treatments, cyclic thermal treatments
Nationell ämneskategori
Metallurgi och metalliska material
Forskningsämne
TEKNIK, Produktions- och materialteknik; Produktionsteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-11941Scopus ID: 2-s2.0-85043393115ISBN: 9788087294796 (tryckt)OAI: oai:DiVA.org:hv-11941DiVA, id: diva2:1168256
Konferens
26th International Conference on Metallurgy and Materials METAL 2017, Brno, Czech Republic, May 24th-26th, 2017
Tillgänglig från: 2017-12-20 Skapad: 2017-12-20 Senast uppdaterad: 2018-09-17Bibliografiskt granskad

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Pederson, Robert

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