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The Quality Assurance of Cast and Wrought Aero Jet Engine Components Made from Ni-base Superalloys with Using of Quantitative Metallography Methods and Alloys Lifetime Prediction

REFERENCES Akca, E., Gurse, l. A., 2015. A Review on Superalloys and IN718 Nickel-Based INCONEL Superalloy. Periodicals of Engineering and Natural Science, 3(1), 15-27. Belan, J., 2012. Study of advanced materials for aircraft jet engines using quantitative metallography . In: R.K. Agarwal (Ed.), Recent Advances in Aircraft Technology, 1 st ed., Vol. 1, InTech, Rijeka, pp. 49-74. Hanumantha Rao, D., Tagore, G.R.N., Ranga Janardhana, G., 2010. Evolution of artificial network (ANN) model for predicting secondary dendrite arm spacing in

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A brief overview and metallography for commonly used materials in aero jet engine construction

References B elan J., K uchariková L., V aško A., C halupová M., Š vecová I. 2016. Employing various metallography methods at high temperature alloy fatigue tests evaluationl . Production Engineering Archives, Vol. 13, No. 4, 11-15. C ampbell F. C. 2006. Manufacturing Technology for Aerospace Structural Materials , Elsevier Ltd., Amsterdam. K onečná R. 2010. Practical Metallography . VEGA. University of Žilina, Žilina. K uchariková L., T illová E., M atvija M., B elan J., C halupová M. 2017. Study of the precipitation

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Microstructural Characterisation of Archeologic Finds Discovered at the Ironworks in Mădăraș

Abstract

In the middle of the 16th century the ironworks of Mădăraș was one of the important centres of iron production. During its one and a half century lifespan its output provided a significant part of Transylvania’s iron supply. While it operated it used up the entire raw material extracted in the iron ore mines of the Felcsík basin. This study presents the reconstructed ground-plan of the ironworks, its layout on the shores of the Mădăraș creek, and the chemical composition and microstructure of the samples discovered during exploration of the location by means of XRF analysis, EDS analysis and metallography. The analysis of the pig iron, the steel and the slag although performed on individual samples, still provides a good approach regarding the products of the ironworks, their chemical composition and microstructural characteristics.

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Advantages of Colour Etching in Quality Control of Recycled Al-Si Cast Alloys

Abstract

Colour Metallography is a set of light metallographic microscopy methodologies that utilize phase colour contrast as a source of new structure information compared to conventional techniques. In many cases, colour contrast can be induced where no identifiable phase contrast is obtained by conventional techniques. With the help of colour contrast, we gain new information on the structure of Al-Si alloys, especially intermetallic phases, in which the benefits of its use in casting quality control are of benefit.

Blue-yellow contrast is definitely more pronounced than dark grey or light grey contrast. There is no substantial reproducible colour reproduction, since it is irrelevant whether the two phases are distinguished by blue-yellow or green-ocher contrast. When using the colour contrast, the structural components differ not only according to their microscopic appearance, but also based on the knowledge of the chemical composition of alloys, interactions between structural components, knowledge of the possible influence of Al-alloys structure (e.g. refining, modifications, heat treatment).

Colour contrast in quality control of Al-Si alloys was applied to AlSiMg cast alloy (AlSi7Mg0.3; AlSi7MgTi; AlSi10MgMn; etc.)

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Verification of the Computed Tomography Results of Aluminum Alloy Welded Joint

Abstract

Computed tomography (CT) of aluminum welded joint specimen has been performed. On the tomographic cross sections some defects have been found. To verify them the metallography cross sections of welded has been done. It was found that selected defects are micro cracks.

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Abrasion Resistance of as-Cast High-Chromium Cast Iron

] Jiyang, Z.: Colour Metallography of Cast Iron I. China Foundry, 2011, Vol. 8, No. 3, p.337. [5] Jiyang, Z.: Colour Metallography of Cast Iron II. China Foundry, 2011, Vol. 8, No. 4, p. 447.

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Possibilities of Evaluation of the Fibre Orientation in Injection Moulding Parts

Abstract

The fibre orientation in short fibre reinforced thermoplastics depends on injection moulding technology parameters. The aim of this paper is to propose possibilities for comparing fibre orientation of the real sample and the result from simulation software. Fibre orientation of selected injection moulding part is simulated. In some selected points second-order tensor of orientation was estimated. Stereological metallography was used for possibility of comparison these results with experimental ones. An experimental result of estimation of degree of fibre orientation is described. The use of stereological metallography allows very simple and effective experimental estimation of short glass fibre orientation, which can be used for experimental verification of numerical simulation model, which can be optimized to obtained coincidence with experiments.

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Ways of Comparation of the Fibre Orientation in Injection Moulding Parts

Abstract

The fibre orientation in short fibre reinforced thermoplastics depends on injection moulding technology parameters. The aim of this paper is to propose possibilities for comparing fibre orientation of the real sample and the result from simulation software. Fibre orientation of selected injection moulding part is simulated. In some selected points secondorder tensor of orientation was estimated. Stereological metallography was used for possibility of comparison these results with experimental ones. An experimental result of estimation of degree of fibre orientation is described. The use of stereological metallography allows very simple and effective experimental estimation of short glass fibre orientation, which can be used for experimental verification of numerical simulation model, which can be optimized to obtained coincidence with experiments.

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Bainite Morphology in Two Experimental Mo-Cr and Mo-Cr-V-Ti Steels

Abstract

The paper presents an investigation of the bainite morphology in two experimental Mo-Cr and Mo-Cr-V-Ti steels using TEM, high speed dilatometry backed by thermodynamic analysis. The microstructure was investigated using metallography and TEM method. After austenitisation at 1200oC followed by bainitic reaction in upper and lower temperatures of isothetmal transformation the bainite was in the form of classical sheaves. The amont, distribution and morphology of retained austenite and bainitic ferrite depend on prior austenitisation and isothermal transformation temperatures within the bainitic range.

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Investigation of Mechanical and Anti-Corrosion Properties of Flame Sprayed Coatings

Abstract

This article presents the results of an examination of the properties of thermal flame sprayed coatings produced by material in the form of four powders (two polymers: PA11 and PA12 CastoPlast, and two high purity: tin and aluminum) on the substrate of the unalloyed structural steel of S235JR grade. Investigations of coating properties are based on metallography tests (SEM and CLSM), measurement of microhardness (acc. to PN-EN ISO 6507-1:2007), anticorrosive (acc. to PN-EN ISO 9227:2017-06) and bend testing. Results demonstrate properties of flame sprayed coatings that are especially promising in the industrial applications where corrosion-resistant coating properties are required. Consequently, performed experiments show that the highest corrosion resistance is demonstrated by steel samples with a polyamide anti-corrosion system. Accelerated corrosion tests showed the lowest corrosion resistance of the tin coating system, however, they do not fully correspond to the corrosion processes in operating conditions.

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