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M. Poręba; J. Sieniawski; M. Zielinska (2007)
Publisher: International OCSCO World Press
Journal: Archives of Materials Science and Engineering
Languages: English
Types: Article
Subjects: Alloys, Nickel superalloys, Grain refinement, Mechanical properties, Materials of engineering and construction. Mechanics of materials, TA401-492, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Technology, T, DOAJ:Materials, DOAJ:Technology and Engineering
Purpose: Nickel based superalloys are widely used for turbine and stator blades of compressor in aero-engines. The objective of this work is to determine the influence of the inoculant’s content (cobalt aluminate) in the surface layer of the ceramic mould on the microstructure and mechanical properties of high temperature creep resisting superalloy René 77.Design/methodology/approach: Experimentally investigated castings have been made of commercially produced nickel superalloy René 77. Stepped and cylindrical samples have been casted for: microstructure and mechanical examinations. During preparation of ceramic face mould, it has been added the suitably inoculant’s content of: 0, 5, 10% mass in zirconium flour. The microstructure analysis has been made by the use of light microscopy. Verification of the influence of CoAl2O4 on the mechanical properties of castings has been investigated on the basis of results obtained form tensile and creep tests.Findings: Modification of the face coat of ceramic mould results in the reduction of the grains size of γ matrix and disintegration of carbide precipitates. It results in the improvement of mechanical properties of the alloy. On the grounds of the obtained results, it was found that the sufficient incoulant concentration in the surface layer of ceramic mould is 5%mass.Research limitations/implications: As the cost of material and process are very high, the castings were made with only three different contents of cobalt aluminate in the surface layer of ceramic mould.Practical implications: Originality/value: It was revealed, that inoculant content have a significant impact on the microstructure of superalloy René 77 depending on the casting section thickness. It was proved that modification of surface layer of ceramic mould has a positive effect on the mechanical properties of superalloy. The researches allowed to find the optimal concentration of CoAl2O4 in ceramic mould to produce casting elements made from superalloy René 77.

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