Microstructure and mechanical properties of precision cast TiAl turbocharger wheel

Jovanović, M.; Dimčić, Biljana; Bobić, Ilija; Zec, S.; Maksimović, Vesna

doi:10.1016/j.jmatprotec.2005.03.019

Cited by 48 publications

(33 citation statements)

References 13 publications

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“…A higher preheating temperature not only improves fluidity of liquid metal but it also reduces thermal gradient and cooling rates. However, a higher preheating temperature may lead to a reaction between metal and the mold, thus increasing the propensity for surface porosity [5]. Other disadvantages are coarser grain size and inferior mechanical properties.…”

Section: Resultsmentioning

confidence: 99%

“…It is cheaper than machining since the material removal is not required [4]. Nevertheless, the failure rate in production of the impeller by investment casting has been 30-40% [5]. The important features of investment casting that affect the quality of cast products are the ceramic shell, gating system design and solidification process [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the failure rate in production of the impeller by investment casting has been 30-40% [5]. The important features of investment casting that affect the quality of cast products are the ceramic shell, gating system design and solidification process [4,5]. Some defects commonly appear in products of investment casting: these include misruns, inclusion, macro and micro porosity and hot cracks.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Al-7Si-Mg-Cu Turbine Impeller Produced by Investment Casting

Syahid

Sofyan²,

Basuki

et al. 2013

AMR

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Abstract. Application of a light-weight material, such as an aluminum alloy, on a turbine impeller can enhance the efficiency of an Organic Rankine Cycle power plant that operates at temperatures below 150 o C. The density of an aluminum alloy is only one-third that of steel. However, increased strength of aluminum alloys is needed for turbine impeller qualification. Investment casting was chosen to produce radial inflow turbine impeller due to their complex geometry and precision. It can replace the machining process, which is time-consuming and less efficient because of material removal. This study describes the investment casting process used to produce a radial inflow impeller turbine. The study also identifies defects, microstructures and properties of radial inflow turbine impeller. The turbine impeller were produced from Al-7Si-4Mg alloy with 0.38, 3.82, and 6.0 wt. % Cu. Visual examination showed that the turbine impeller was free of macro defects and misruns. The microstructures of the component were characterized by Optical Microscopy and SEM. The structures consisted of α-Al, Si eutectic, AlMgSi, AlMgFeSi (Chinese script) and CuAl 2 . The higher hardness value of 54HRB was affected by Cu content due to the good mechanical properties of CuAl 2 phase.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of Al-7Si-Mg-Cu Turbine Impeller Produced by Investment Casting

Syahid

Sofyan²,

Basuki

et al. 2013

AMR

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“…Another way is to reduce the weight of fast rotating turbine blades in aircraft engines. Beside the commonly used Ni-based superalloys γ − titanium aluminides offer the required high specific strength from room-temperature up to 1000°C [1,2]. With a specific weight of 3.8 g/cm³ compared to 8 g/cm³ of Ni-based superalloys the overall weight of the components could be reduced drastically.…”

Section: Introduction *mentioning

confidence: 99%

Development of a PIGE-Detection System for in-situ Inspection and Quality Assurance in the Evolution of Fast Rotating Parts in High Temperature Environment Manufactured from TiAl

et al. 2013

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Intermetallic γ-titanium aluminides are a promising material in high temperature technologies. Their high specific strength at temperatures above 700°C offers the possibility for their use as components of aerospace and automotive industries. With a specific weight of 50% of that of the widely used Ni-based superalloys TiAl is very suitable as material for fast rotating parts like turbine blades in aircraft engines and land based power stations or turbocharger rotors. Thus lower mechanical stresses and a reduced fuel consumption and CO 2 -emission are expected. To overcome the insufficient oxidation protection the halogen effect offers an innovative way. After surface doping using F-implantation or liquid phase-treatment with an F-containing solution and subsequent oxidation at high temperatures the formation of a protective alumina scale can be achieved. By using non-destructive ion beam analyses (PIGE, RBS) F was found at the metal/oxide interface. For analysis of large scale components a new vacuum chamber at the IKF was installed and became operative. With this prototype of in-situ quality assurance system for the F-doping of manufactured parts from TiAl some performance test measurements were done and presented in this paper.

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“…For example, modification of the chemical composition by alloying with substitutional elements like vanadium increases ductility and fracture toughness (Hishinuma et al, 1999). Another alternative for enhancing properties of TiAl-based alloys is application of novel processing methods allowing for accurate control of size and distribution of constituent phases (in particular refinement of the lamellar microstructure) and reducing the grain size (Jovanović et al, 2005;Morris & Leboeuf, 1997).…”

Section: Introductionmentioning

confidence: 99%

Mechanical alloying and high pressure processing of a TiAl‐V intermetallic alloy

Dymek

Wróbel

Witczak

et al. 2010

Journal of Microscopy

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SummaryAn alloy with a chemical composition of Ti-45Al-5V (at.%) was synthesized by mechanical alloying in a Szegvaritype attritor from elemental powders of high purity. Before compaction, the powders were characterized by X-ray diffraction and scanning as well as transmission electron microscopy. The compaction of powders was carried out by hot isostatic pressing and hot isostatic extrusion. The resulting material was subjected to microstructural and mechanical characterization. The microstructure investigated by transmission and scanning electron microscopy supplemented by X-ray diffraction revealed that the bulk material was composed of a mixture of TiAl-and Ti 3 Al-based phases, however, the typical lamellar microstructure for such alloys was not observed. The materials exhibited exceptionally high yield strength together with satisfactory ductility and fracture toughness. The high strength was unequivocally due to grain refinement and the presence of oxide dispersoid.

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Microstructure and mechanical properties of precision cast TiAl turbocharger wheel

Cited by 48 publications

References 13 publications

Characterization of Al-7Si-Mg-Cu Turbine Impeller Produced by Investment Casting

Characterization of Al-7Si-Mg-Cu Turbine Impeller Produced by Investment Casting

Development of a PIGE-Detection System for in-situ Inspection and Quality Assurance in the Evolution of Fast Rotating Parts in High Temperature Environment Manufactured from TiAl

Mechanical alloying and high pressure processing of a TiAl‐V intermetallic alloy

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