A complex procedure for describing porosity in precision cast elements of aircraft engines made of MAR-M 247 and MAR-M 509 superalloys

Roskosz, S.; Staszewski, Marek; Cwajna, Jan

doi:10.1016/j.matchar.2005.11.005

Cited by 22 publications

(10 citation statements)

References 2 publications

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“…The determination of gas and shrinkage porosity was carried out on the polished samples by quantitative metallography. The complex procedure of the quantitative evaluation of gas and shrinkage porosity, described in [8], was used. The samples were mechanically ground on abrasive paper (grit sizes: 320, 600, 800 and 1000), polished with diamond suspensions (grit sizes: 9 μm, 3 μm, 1 μm and 0.25 μm, respectively) and with alumina suspension (grit size: 0.05 μm).…”

Section: Methodsmentioning

confidence: 99%

Quantitative Evaluation of Porosity in Turbine Blades Made of IN713C Superalloy After Hot Isostatic Pressing

Roskosz¹

2017

Archives of Metallurgy and Materials

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The aim of this paper is an assessment of the influence of hot isostatic pressing treatment on porosity of cast samples -turbine blades and vane clusters made of the IN713C superalloy. Two variants of HIP treatments, differing in pressure from each other, have been used.The quantitative evaluation of the porosity was performed using light microscopy and quantitative metallography methods. The use of the hot isostatic pressing significantly decreased the volume fraction and size of pores in the test blades, the remaining pores after the HIP process being characterized by a round shape. The increased pressure has caused significant reductions in the area fraction and size of the pores.

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Section: Methodsmentioning

confidence: 99%

Quantitative Evaluation of Porosity in Turbine Blades Made of IN713C Superalloy After Hot Isostatic Pressing

Roskosz¹

2017

Archives of Metallurgy and Materials

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“…For microstructural characterization, the samples were sectioned from the mid-airfoil areas, perpendicular to the blade axis. The samples were prepared according to procedure described earlier [9][10][11]. After ultrasonic cleaning, electrochemical etching in 10% oxalic acid solution (voltage: 6V, time: 5s) was applied.…”

Section: Methodsmentioning

confidence: 99%

“…For EBSD analysis, samples were additionally polished using an alumina suspension (grit size: 0.05 µm) for 5 h with vibration. The determination of internal porosity was carried out on polished samples by image analysis based on optical micrographs (using an Olympus GX-70 light microscope) in accordance with procedures described in literature [9][10][11].…”

Section: Methodsmentioning

confidence: 99%

Characterizing the Effects of Hot Isostatic Pressing on IN713C Superalloy Blade Microstructure by Electron Backscatter Diffraction

2016

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The integrity of turbine blades is essential for the safe operation of jet engines. Thus, the mechanical properties, especially creep resistance and fatigue strength at high temperatures, must be thoroughly optimized. In particular, it has previously been observed that the mechanical properties of blades depend on the microstructure and porosity resulting from the casting process. To decrease the internal porosity generated by investment casting, hot isostatic pressing can be applied. This paper aims to evaluate the effects of hot isostatic pressing on the microstructure of IN713C alloy blades. Two variants of hot isostatic pressing treatment, differing in pressure, were carried out, and each resulted in lowered porosity. Microstructural investigations, performed using scanning electron microscopy and electron backscatter diffraction revealed significant changes of γ particles and high strain intensity in the surface layer of the blades after hot isostatic pressing treatment.

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“…Each section was measured in 10 places with 2.94 mm 2 analysis area. MetIlo software was used to calculate porosity values [8]. Average and maximum value (for the worst field) of the area fraction of pores A A of each cross-section have been noted.…”

Section: Experimental Methodsmentioning

confidence: 99%

Porosity of Solid and Cored Turbine Blades of Aircraft Engines

Roskosz

Nawrocki

Kubiak

2015

SSP

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Paper presents results of quantitative evaluation of porosity conducted on big, thin walled airfoil turbine blades made from Inconel 713C alloy. To decrease mass, blades are design and manufacture like thin walled cored castings. Manufacturing of big thin walled casting airfoil blades is extremely difficult. During exploitation casting work undergo cycle fatigue. In that cause casting should be free of casting defects, including porosity. Conducted research focused on Inconel 713C superalloy pouring temperature effect on porosity level of cored casted turbine blade. Results were compared to porosity of solid casted turbine blade. It was found that porosity of cored blades is lower than solid blade porosity. In cored blades higher porosity is located on airfoil convex side. Airfoil concave side has lower porosity.

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A complex procedure for describing porosity in precision cast elements of aircraft engines made of MAR-M 247 and MAR-M 509 superalloys

Cited by 22 publications

References 2 publications

Quantitative Evaluation of Porosity in Turbine Blades Made of IN713C Superalloy After Hot Isostatic Pressing

Quantitative Evaluation of Porosity in Turbine Blades Made of IN713C Superalloy After Hot Isostatic Pressing

Characterizing the Effects of Hot Isostatic Pressing on IN713C Superalloy Blade Microstructure by Electron Backscatter Diffraction

Porosity of Solid and Cored Turbine Blades of Aircraft Engines

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