Metal injection moulding of Inconel 713C for turbocharger applications
Feature article: PIM International, Vol.5 No.3 September 2011, pages 61-64, 1023 wordsPolyMIM GmbH, Am Gefach, 55566 Bad Sobernheim, Germany
In response to growing interest in the manufacture of high performance turbocharger components via Metal Injection Moulding, PolyMIM GmbH based in Bad Sobernheim, Germany, has started the production of an Inconel 713C feedstock specifically targeted towards the turbocharger market.
In the following article, Dr. Natalie Salk presents the company’s most recent data on the processing and properties of tensile test bars processed using a water soluble binder system.
A turbocharger is a device designed to increase the air pressure within an internal combustion engine, allowing an enhanced quantity of fuel to be burned at each stroke. This significantly raises the power output of the engine and therefore the engine performance.
The turbocharger is powered by a compressor driven turbine, which in turn is driven by the exhaust gases of the respective engine.
These extreme conditions require materials with excellent mechanical properties as well as good oxidation resistance at high temperatures. Here only the superalloys are applicable.
Superalloys  are high-performance nickel-base alloys that exhibit excellent mechanical strength and creep resistance at high temperatures, good surface stability, corrosion and oxidation resistance .
This material class is mainly produced by investment casting, direct solidification , powder metallurgy via hot isostatic pressing, or spray forming . However, powder metallurgy, and here, metal injection moulding (MIM) technology still play a relatively minor role in the production of superalloys.
To overcome this and to exploit the advantages of MIM technology, such as, geometrical complexity, cost effective mass production and material variety, PolyMIM GmbH has developed a new feedstock based on the superalloy Inconel 713C.
In the following tests this material was injection moulded, debound and sintered, and material properties such as density, tensile strength at temperatures up to 1000°C and metallography were examined........
Further sections of this article include:
- Experimental procedure
- Characterisation of material properties
- Conclusions and outlook
Figures and Tables:
Fig. 1 Inconel 713C green parts (left) and sintered tensile test parts (right)
Fig. 2 Micrograph of the Vickers indentation marks in the polished IN713C sample
Fig. 3 Zwick hot tensile test machine located at the Fraunhofer IWU
Fig. 4 Hot tensile tests were only possible after reducing the thickness of the test bar to 2 mm by erosion
Fig. 5 Broken IN713C sample after the hot tensile test (left) and modified fixation (right)
Fig. 6 Graph of the determined tensile properties of IN713C at temperatures of 650°C, 850°C and 1000°C
Fig. 7 Micrographs of the polished (top) and etched (bottom) IN713C material; both pictures illustrate an equal magnification
Table 1 Summary of the theoretical composition of IN713C, the powder composition from the TDS and the measured sintered material
Table 2 Tensile test results at room temperature, with Rp0.2 as tensile strength at 0.2% non-proportional elongation, Rm as ultimate tensile strength and A* as elongation
Table 3 Results of the tensile tests at temperatures of 650°C, 850°C and 1000°C. The tensile tests were performed by applying the as-sintered samples
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