Investment Casting of Near-Net Shape Gamma Titanium Aluminide Automotive Turbocharger Rotor

The objective of this study was to optimize the casting design of gamma titanium aluminde automotive turbocharger rotor by means of the practical experiment and numerical simulation. Gamma titanium aluminide rotors were produced by centrifugal casting methods on a laboratory scale. Based on the metal-mold reaction of gamma titanium aluminide, the investment molds were manufactured by an electro-fused Al2O3 mold. The experimental results showed that the castings failed to reach the end of the cavities due to insufficient centrifugal force and a lower fluidity compared to the other metals. Although the satisfactory results were not obtained in the numerical simulation, it was concluded that numerical simulation aided to achieve understanding of the casting process and defect formation in gamma titanium aluminide turbocharger rotor castings.

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Advancement of Plasma Cold-Hearth Melting for Production of Gamma Titanium Aluminide Alloys within Arconic

MATEC Web of Conferences ◽

10.1051/matecconf/202032108008 ◽

2020 ◽

Vol 321 ◽

pp. 08008

Author(s):

Ernie Crist ◽

Birendra Jena ◽

Michael Jacques ◽

Matt Dahar ◽

Don Li ◽

...

Keyword(s):

Titanium Aluminide ◽

Centrifugal Casting ◽

Hot Isostatic Pressing ◽

Industrial Applications ◽

Vacuum Arc ◽

Gamma Titanium Aluminide ◽

Gamma Titanium ◽

Arc Melting ◽

The Impact ◽

Titanium Aluminide Alloys

Utilization of gamma titanium aluminide alloys in aerospace and automotive/industrial applications has placed significant demand on melting sources for products to be used in cast, wrought, and direct-machining applications. There is also an increased demand for input stock used in gas atomization of powders. Current technologies used in ingot manufacturing include plasma arc melting, vacuum arc melting, and induction skull melting + centrifugal casting. Subsequent processing may include forging, re-melting + casting, or machining directly into components. Over the past six years, Arconic Engineered Structures has developed a robust melting method using plasma cold-hearth melting technology, including the design and implementation of a new 3-torch system to produce Ti-48-2-2 cast bars. General discussions concerning plasma cold-hearth melting, manufacturing challenges, and metallurgical attributes associated with cast Ti-48-2-2 bars will be reviewed. Emphasis will be on understanding the impact of hot isostatic pressing on internal voids, residual stress cracking and resulting mechanical properties.

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Qualification of an Investment Casting Process for Production of Titanium Aluminide Components for Aerospace and Automotive Applications

Materials Science Forum ◽

10.4028/www.scientific.net/msf.638-642.1275 ◽

2010 ◽

Vol 638-642 ◽

pp. 1275-1280 ◽

Cited By ~ 6

Author(s):

Julio Aguilar ◽

Ulrike Hecht ◽

Andre Schievenbusch

Keyword(s):

Investment Casting ◽

Titanium Aluminide ◽

Titanium Aluminides ◽

Centrifugal Casting ◽

Casting Process ◽

The Past ◽

Production Route ◽

Automotive Parts ◽

Near Net Shape ◽

Cluster Design

Over the past years significant efforts were dedicated to developing production processes for aerospace and automotive parts from light weight titanium aluminides. Considerable progress was achieved worldwide in the field of near net shape casting. Access has developed an own production route, based on centrifugal investment casting. Various components from TiAl-based alloys, including turbocharger wheels and stator vanes were successfully cast and supplied for engine tests. A newly developed automated centrifugal casting line was recently taken into operation. This presentation will describe our activities that aimed to qualify the casting line for series production of turbocharger wheels: apart from basic issues of casting cluster design, process control and quality inspection we will discuss the casting process from the perspective of its techno-economic characteristics

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Investment Casting of Near-Net Shape Gamma Titanium Aluminide Automotive Turbocharger Rotor

Materials Science Forum - PRICM-5 ◽

10.4028/0-87849-960-1.2547 ◽

2005 ◽

pp. 2547-2550

Author(s):

Myoung Gyun Kim ◽

Si Young Sung ◽

Gyu Chang Lee ◽

Joon Pyo Park ◽

Young Jig Kim

Keyword(s):

Investment Casting ◽

Titanium Aluminide ◽

Gamma Titanium Aluminide ◽

Gamma Titanium ◽

Near Net Shape

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Limitations of an Indentation Model for Grinding Gamma Titanium Aluminide

Dynamic Systems and Control ◽

10.1115/imece2002-32038 ◽

2002 ◽

Author(s):

H. Ali Razavi ◽

Steven Danyluk ◽

Thomas R. Kurfess

Keyword(s):

Force Control ◽

Titanium Aluminide ◽

Normal Force ◽

Removal Rate ◽

Cubic Boron Nitride ◽

Normal Component ◽

Grinding Force ◽

Cutting Depth ◽

Gamma Titanium Aluminide ◽

Gamma Titanium

This paper explores the limitations of a previously reported indentation model that correlated the depth of plastic deformation and the normal component of the grinding force. The indentation model for grinding is studied using force control grinding of gamma titanium aluminide (TiAl-γ). Reciprocating surface grinding is carried out for a range of normal force 15–90 N, a cutting depth of 20–40 μm and removal rate of 1–9 mm3/sec using diamond, cubic boron nitride (CBN) and aluminum oxide (Al2O3) abrasives. The experimental data show that the indentation model for grinding is a valid approximation when the normal component of grinding force exceeds some value that is abrasive dependent.

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The Dependence of Tensile Ductility on Investment Casting Parameters in Gamma Titanium Aluminides

MRS Proceedings ◽

10.1557/proc-552-kk2.1.1 ◽

1998 ◽

Vol 552 ◽

Author(s):

R. Raban ◽

L. L. ◽

T. M.

Keyword(s):

Titanium Aluminide ◽

Titanium Aluminides ◽

Tensile Ductility ◽

Gamma Titanium Aluminide ◽

Cooling Rates ◽

Gamma Titanium ◽

Investment Cast ◽

Thermal Data ◽

Titanium Aluminide Alloys ◽

Simulation Package

ABSTRACTPlates of three gamma titanium aluminide alloys have been investment cast with a wide variety of casting conditions designed to influence cooling rates. These alloys include Ti-48Al-2Cr-2Nb, Ti- 47Al-2Cr-2Nb+0.5at%B and Ti-45Al-2Cr-2Nb+0.9at%B. Cooling rates have been estimated with the use of thermal data from casting experiments, along with the UES ProCAST simulation package. Variations in cooling rate significantly influenced the microstructure and tensile properties of all three alloys.

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