The Fuzzy Approach to Assessment of ANOVA Results

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].

Section: Discussionsupporting

confidence: 40%

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

Nawrocki

Pietraszek

2017

“…It seems that one should use more sophisticated, but also more computationally expensive statistical non-parametric methods [14][15][16] in further investigation to reveal relationships between factors deeper than it is possible in a classic statistical analysis [12], however the computational cost of such enhancement is very high [17][18]. If the mesh of samples nodes in the space of factors is sparse, it would rather be explored by a factorial approach [19][20][21], while if the mesh is dense, the response surface methodology (RSM), particularly with the local approximation, seems to be more appropriate [22][23].…”

Section: Discussionmentioning

confidence: 42%

Metallographic Study and Repeatability Analysis of γ' Phase Precipitates in Cored, Thin-Walled Castings Made from IN713C Superalloy

Pietraszek

Radek²

2017

The study describes the influence of a surface modification in cored, thin-walled castings of blades from IN-713C nickel superalloy on γ' phase precipitates. The blades were produced by using the investment casting process in the laboratory conditions as parts for a low-pressure turbine rotor. The microstructural observations of the γ' phase precipitates on the cross sections of the blades were performed. The observations were followed by quantitative metallography evaluation, and finally, a comparison of the precipitates between one blade with the conventionally applied ceramic core and one with the core covered layer contained a surface modifier (5% of CoAl 2 O 4 ) was made.

“…The further investigation on data analysis will be conducted involving specific nonparametric methods for the analysis of multidimensional sparse data [14][15][16][17][18][19][20], even with a multiphysics approach [21] and the fuzzy statistics [22].…”

Section: Discussionmentioning

confidence: 48%

The fixed-effects analysis of the relation between SDAS and carbides for the airfoil blade traces

Pietraszek¹,

Radek²

2017

The primary objective was to test a usefulness of the specific fixed-effect model for the analysis of quantitative relationships gathered from the image analysis of the material microstructures. The dataset was obtained from the investigation of turbine blades made from superalloy IN713C. The analysis based on the general linear model resulted in informative plots revealing mutual relationships between secondary dendrite arm spacing and the mean plane section area of carbides in the material. Directions for further research also were obtained.