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The Effect of Shell Thickness, Insulation and Casting Temperature on Defects Formation during Investment Casting of Ni-base Turbine Blades
Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.ORCID iD: 0000-0003-3086-0901
TPC Componenst AB, Hallstahammar, Sweden .
Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
2015 (English)In: Archives of Foundry Engineering, ISSN 1897-3310, E-ISSN 2299-2944, Vol. 15, no 4, p. 115-123Article in journal (Refereed) Published
Abstract [en]

Turbine blades have complex geometries with free form surface. Blades have different thickness at the trailing and leading edges as well as sharp bends at the chord-tip shroud junction and sharp fins at the tip shroud. In investment casting of blades, shrinkage at the tip-shroud and cord junction is a common casting problem. Because of high temperature applications, grain structure is also critical in these castings in order to avoid creep. The aim of this work is to evaluate the effect of different process parameters, such as, shell thickness, insulation and casting temperature on shrinkage porosity and grain size. The test geometry used in this study was a thin-walled air-foil structure which is representative of a typical hot-gas-path rotating turbine component. It was observed that, in thin sections, increased shell thickness helps to increase the feeding distance and thus avoid interdendritic shrinkage. It was also observed that grain size is not significantly affected by shell thickness in thin sections. Slower cooling rate due to the added insulation and steeper thermal gradient at metal mold interface induced by the thicker shell not only helps to avoid shrinkage porosity but also increases fill-ability in thinner sections.

Place, publisher, year, edition, pages
2015. Vol. 15, no 4, p. 115-123
Keyword [en]
Casting defects, Grain structure, Investment casting, Niyama criterion, Shrinkage porosity, Turbine blades, Crystal microstructure, Grain size and shape, High temperature applications, Insulation, Investments, Nickel, Porosity, Shells (structures), Shrinkage, Thermal insulation, Thin walled structures, Turbine components, Turbines, Casting defect, Casting temperatures, Different thickness, Metal-mold interface, Process parameters, Turbine blade, Turbomachine blades
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-29379DOI: 10.1515/afe-2015-0090ISI: 000215109300022Scopus ID: 2-s2.0-84943736284OAI: oai:DiVA.org:mdh-29379DiVA: diva2:862782
Available from: 2015-10-23 Created: 2015-10-23 Last updated: 2018-01-22Bibliographically approved

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Raza, Mohsin

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