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2 Archives of Metallurgy and Materials

2 2017

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The Impact of the Thickness of the Ceramic Shell Mould on the (γ + γ') Eutectic in the IN713C Superalloy Airfoil Blade Casting

Szczotok A., Nawrocki J., Pietraszek J.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 2A

587--593

In the study the wall thickness of ceramic shell mould influence on (γ + γ') eutectic in the IN713C nickel-based superalloy airfoil blade casting was described. Two castings formed as a blade from two wax pattern assemblies were analysed. In the experiment in one pattern the thick ceramic layer was obtained on pressure side and in another one on suction side of the airfoil blade. The microstructure of the crosssections of the castings were observed on polished and etched metallographic specimens. The microstructure and phases chemical compositions of specimens was analyzed by using the scanning electron microscope Hitachi S-4200 equipped with EDS. It was established, that wall thickness of ceramic shell mould affect size, shape and volume fraction of (γ + γ') eutectic islands in airfoil blade made from IN713C superalloy. The analysis was provided in accordance to the typical statistical methodology [1].

Evaluation of Carbides in Turbine Blade Made of IN713C Superalloy After Hot Isostatic Pressing

Kościelniak B., Roskosz S., Cwajna J.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 1

247--252

The IN713C is nickel-based superalloy, used to produce low pressure turbine blades in a process of investment casting. However, porosity which is formed during the casting, decreases mechanical properties of IN713C. Therefore, to eliminate porosity, a process of hot isostatic pressing was applied. Nonetheless, HIP also least to some changes in the microstructure of tested material. The main aim of this paper is to characterize the morphology of carbides before and after hot isostatic pressing. Microstructural characterization was carried out with the use of a scanning electron microscope equipped with an energy dispersive X-ray spectrometer and an electron backscatter diffraction detector. The size and shape of carbides were evaluated by quantitative metallography methods methods. The results show that the amount, size and heterogeneity of arrangement of the carbides increased after application of HIP treatment.