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Metallographic Study of the Casting Made from CMSX-6 SC Nickel-Based Superalloy

Szczotok A.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 2A

581--586

Microstructural characterization is an important tool to optimize the properties of engineering materials. Quantitative metallography is a common technique, which provides three-dimensional estimations of phases and structure elements from two-dimensional images. Metallography has been described as both a science and an art [1]. Superalloys are high-performance alloys which exhibits excellent mechanical strength and creep resistance at high temperatures, good surface stability, and corrosion and oxidation resistance. Temperature and corrosion resistant materials such as nickel-based superalloys are prepared mostly with standard metallographic techniques. However, the results can be significantly improved by using finely graded CMP (chemical mechanical polish) polishing solutions on a high napped polishing pad. Sample preparation requires a certain degree of skills and experience, due to the high chemical resistance of most superalloys. Some chemical solutions are able to dissolve the γ matrix and recover the γ' residue, and some others solutions can be used to obtain a contrary effect – dissolve the γ' phase precipitates and recover the γ matrix residue. The aim of the presented research is to describe qualitatively and quantitatively the as-cast microstructure of CMSX-6 SC superalloy. The author’s attention has been concentrated on the γ' phase precipitates morphology. The results of using optical and scanning electron microscopy (SEM) are presented.

Turbine blades of the single crystal nickel based CMSX-6 superalloy

Onyszko A., Kubiak K., Sieniawski J.

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 32, nr 1

66-69

Purpose: Research and Development Laboratory for Aerospace Materials in Rzeszow University of Technology is the place where production of single crystal nickel base superalloys has been proved technically feasible. This paper presents the method of manufacturing the single crystal superalloys turbine blades and the prospective developments of the enterprise. Design/methodology/approach: Turbine blades were produced in the vacuum induction melting furnace ALD for investment casting of equiaxed, directionally solidified and single crystal materials. The CMSX-6 nickel based superalloy is used for production of turbine blades. Findings: The ceramic moulds production process was formulated. All main parameters of single crystal production was accordanted. Research limitations/implications: EBSD analysis clearly revealed that the casted turbine blades are single crystals and possessed [001] crystal orientation. Originality/value: The paper gives a general review of the technology of production single crystals turbine blades.