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Study of alpha case depth in Ti-6Al-2Sn-4Zr-2Mo and Ti-6Al-4V
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
2013 (English)In: 7th EEIGM International Conference on Advanced Materials Research: 21–22 March 2013, LTU, Luleå, Sweden, IOP Publishing Ltd , 2013, 12002Conference paper (Refereed)
Abstract [en]

Titanium alloys, mostly Ti-6Al-2Sn-4Zr-2Mo (Ti-6242) and Ti-6Al-4V (Ti-64) are used in aero engine applications, because they possess high specific strength. The future concept in designing aircraft engines results in higher pressure, which increases the efficiency of aircraft engines by achieving high thrust and lowering the fuel consumption. Nevertheless, higher pressure in the engine means increase of service temperature. These conditions enforce new requirements on the materials used for manufacturing the engine components (compressors). Ti-6242 is mostly used in compressors where the service temperature is in the range of 400-450°C. It is well known that titanium alloys above 480°C for longer service time have tendency to form a hard and brittle oxygen stabilized surface layer (α-case). This layer has impact on the mechanical properties of the surface, by lowering the tensile ductility and the fatigue resistance. Factors that contribute for growth of α-case are: presence of oxygen, exposure time, temperature and pressure. In order to extend the service temperature of titanium alloys, it is required to understand the formation of α-case at high temperatures for long exposure times. In the present study, isothermal oxidation experiments in air were performed on forged Ti-6242 alloy at 500°C and 593°C up to 500 hours. Similar studies were also performed on Ti-64 sheet at 593°C and 700°C. Alpha case depths for both alloys were quantified using metallography techniques and compared.

Place, publisher, year, edition, pages
IOP Publishing Ltd , 2013. 12002
Series
, I O P Conference Series: Materials Science and Engineering, ISSN 1757-8981 ; 1
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-38664DOI: 10.1088/1757-899X/48/1/012002Local ID: d1d7731f-17be-4df5-bced-73461fcdbedfOAI: oai:DiVA.org:ltu-38664DiVA: diva2:1012165
Conference
EEIGM International Conference on Advanced materials research : 21/03/2013 - 22/03/2013
Note
Validerad; 2013; 20130818 (raggad)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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Gaddam, RaghuveerSefer, BirhanPederson, RobertAntti, Marta-Lena
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