Basischarakterisierung der β-erstarrenden TNM™-Legierung für die Anwendung als Turbinenrad im Turbolader

Translated title of the contribution: Basic characterisation of a β-solidified TNM™-alloy for application as turbine wheel in turbochargers

Martin Müller

Research output: ThesisDiploma Thesis

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Abstract

Due to the energy saving trend of downsizing automotive engines, the performance of the turbocharger is getting more and more importance. The great advantage of implementation of TiAl as turbine-wheel material is the low density of about 4,2 g/cm3. Due to this fact, the reaction time of the turbocharger can be reduced in comparison to turbine wheels made of Ni-base alloys with a density of ca. 8 g/cm3. So the turbo-lag at low revolutions per minute can be reduced or even prevented. A turbocharger wheel is produced by means of die-forging of a cylindrical cast and hot-isostatically pressed pre-material. After the forging process, the final contour of the wheel is machined. The motivation of this thesis was the material characterisation before and after the property-optimized die-forging process as well as after forging with parameters deviating from the optimized die-forging process. The basic characterisation was performed by means of scanning electron microscopy, phase fraction analysis based on quantitative metallography and X-ray diffraction, measurements of thermo-physical properties, hardness tests, tensile tests and creep tests.
Translated title of the contributionBasic characterisation of a β-solidified TNM™-alloy for application as turbine wheel in turbochargers
Original languageGerman
QualificationDipl.-Ing.
Supervisors/Advisors
  • Mayer, Svea, Co-Supervisor (internal)
  • Clemens, Helmut, Supervisor (internal)
Award date14 Dec 2012
Publication statusPublished - 2012

Bibliographical note

embargoed until 19-10-2017

Keywords

  • Intermetallic materials
  • turbine wheel
  • titanium aluminide
  • TNM
  • forging
  • mechanical properties
  • thermo-physical properties

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