Applied sciences

Archives of Foundry Engineering

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Archives of Foundry Engineering | 2025 | vol. 25 | No 4

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Abstract

The article uses the results obtained during the tests of a wide group of metal alloys using a device operating by the Coffin method. The measure of resistance to thermal-mechanical fatigue is the number of cycles that the sample withstands before a macrocrack occurs, at a fixed current and temperature range. The device offers the possibility of working in two modes of sample mounting. The first mode allows the sample to freely elongate parallel to its axis, while the second mounting mode limits this elongation by using a transducer. The aim of the publication is to present possible solutions for anomaly detection. Anomaly detection concerns traps that may occur during the measurement process. Advanced machine learning methods were used to analyze and detect anomalies in data regarding thermal fatigue resistance. Isolation Forest and One-Class SVM algorithms were used for anomaly detection, which allow for effective identification of unusual patterns in the data. The conducted research confirmed the usefulness of one of the selected methods in the process of anomaly identification using the example of elongation.
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Bibliography

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Authors and Affiliations

K. Jaśkowiec
1
ORCID: ORCID
D. Wilk-Kołodziejczyk
2
ORCID: ORCID
K. Nosarzewski
2

  1. Łukasiewicz Research Network – Krakow Institute of Technology, Kraków, Poland
  2. AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Kraków, Poland
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Abstract

The paper presents the results of research on the production and application of a sintered iron-based composite reinforced with natural zeolite particles. Mechanical properties were tested and the quality of the connection between the particles and the metal matrix was assessed. Before the composite production process, the chemical composition and morphology of natural zeolite particles were examined. Zeolite particles with a diameter of less than 0.2 mm were used to produce sinters. The zeolite particles were subjected to chemical composition (EDS) and phase (XRD) analyses. Zeolite particles were introduced into the iron matrix in amounts of 5, 10, and 15% by weight. Before the sintering process, the zeolite particles were compacted in a hydraulic press at a pressure of 400 MPa. Sintering of the green compacts was carried out in a tubular furnace at 950°C in an atmosphere of dissociated ammonia for 60 minutes. The obtained composites were subjected to porosity, hardness, and density measurements. Microstructure and chemical composition studies were conducted using a scanning electron microscope (SEM). Iron–zeolite composites are characterized by higher hardness and porosity compared to sintered iron. The introduction of zeolite particles also reduces the density of the composites.
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Authors and Affiliations

M. Kargul
1
ORCID: ORCID
J.M. Borowiecka-Jamrozek
1
ORCID: ORCID

  1. Kielce University of Technology, Poland
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Abstract

This article presents structural analysis and mechanical property evaluation of two coatings applied using the APS (Air Plasma Spraying) method on a P250GH boiler steel substrate. Two different powders were used for coating deposition: WCCoCr, based on tungsten carbide, and CrCNi, based on chromium carbide. To assess the coating-substrate bond quality, a scratch test was conducted using a Rockwell diamond indenter under a constant load of 10 N, moving from the substrate toward the coating. No delamination at the coating-substrate interface was observed, indicating a high-quality bond. Microhardness measurements were performed using a 200 g load. The average microhardness values were 886 HV0.2 for the WCCoCr coating and 904 HV0.2 for the CrCNi coating. The coatings were also tested for cavitation resistance according to the ASTM G32-16 standard. Surface roughness profiles were measured before and after 120 minutes of cavitation exposure. Cavitation wear was evaluated based on the difference in roughness values, determined by the Sz parameter, which, according to ISO 25178, is defined as the difference between the highest peak and the lowest valley on the surface. The obtained results indicate that APS thermal spray coatings based on tungsten carbide powders can be used for machine components to enhance cavitation erosion resistance.
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Authors and Affiliations

M. Radoń
1
ORCID: ORCID
B. Kupiec
1
ORCID: ORCID

  1. Rzeszow University of Technology, Poland
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Abstract

Verification of design conclusions using experimental methods is often employed and usually more justified than other techniques for producing machine or device components. Castings are characterized by complex shapes, varying sizes and, as a result, diverse physical and mechanical properties. Additionally, relatively small batches of alloys prepared for casting introduce unintended variation that affects final characteristics and acceptance criteria. It is therefore important to consider the slightly different mechanical properties of finished castings, which may vary even within the same part due to different solidification and cooling conditions. Despite these limitations, the foundry industry occupies an important position in national economies, with indicators showing steady development driven by low manufacturing costs, improved technologies, and new designs with stricter acceptance criteria. The aim of this work is to briefly present one experimental method of stress and strain analysis — the photoelastic method.
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Authors and Affiliations

M.L. Maj
1
ORCID: ORCID
W. Stachurski
1

  1. AGH University of Krakow, Faculty of Foundry Engineering, Poland
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Abstract

This paper presents 419 test data from 6 months continuous production. The results show that, through strict control of raw materials, melting, and spheroidization processes, high-quality, as-cast ductile iron casting with stable composition and stable as-cast structure are obtained, and with using advanced professional heat treatment equipment for austempering treatment, the ADI properties are excellent, all higher than the minimum requirements of ASTM and Chinese national standards. The results also show that the dispersion of high strength grade ADI properties is relatively small, while that of high ductility grade ADI is relatively high. By analyzing the statistical data, in order to further reduce the dispersion of mechanical properties in high-volume production and improve the stability and consistency of ADI products, it is necessary to strictly control the production process, ensuring that ADI products for one grade have as similar chemical compositions and as-cast microstructures as possible. Additionally, precise control of the austempering treatment process should be implemented in a categorized manner based on factors such as casting section thickness, chemical and alloying composition, and as-cast microstructure.
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Authors and Affiliations

Wenbang Gong
1
Zhongding Zhou
1
Mintang Zhang
2
Wenqing Yang
2
Li Sun
1

  1. School of Mechanical Engineering and Automation, Wuhan Textile University, China
  2. Henan ADI Casting Co., Ltd, China
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Abstract

This study addresses an existing gap by examining the foundry properties of Ravi River sands, a subject that has not been explored in earlier studies. Several mechanical and physical tests were used to assess the foundry qualities of sands from different areas. These local sands were used to make molds for Al alloy castings, and the parts' surface roughness (Ra) was assessed. The findings showed that the grain size of the sand varied by location, with the highest grain fineness number (GFN) being 106 and the lowest being 71. All samples exhibited a pH > 7, confirming their suitability for strong binder adhesion. The sand from Syed Wala Bridge had the highest grain fineness number (~106), whereas the sand from Sheraza Pattan Bridge had the lowest (~71). All sand samples showed a constant increase in mold strength when the binder (bentonite clay) percentage was raised from 5% to 25%. The study demonstrates the potential of Ravi River sands to eliminate reliance on imported materials and reduce costs.
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Authors and Affiliations

F. Hussain
1
ORCID: ORCID
M. Kamran
1
A. Inam
1
M. Ishtiaq
1
M.H. Hassan
1
ORCID: ORCID
F. Riaz
1
T. Khan
1
M. Ammar
1
M. Salman
1

  1. Institute of Metallurgy and Materials Engineering, University of the Punjab, Lahore, Pakistan.
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Abstract

Austempered Ductile Iron (ADI) casting technology is a combination of the smelting process, its post-furnace treatment and the heat treatment of castings. Maintaining the process parameter stability of this innovative high quality cast iron with high Tensile Strength UTS and ductility properties is the aim of a number of studies on the control of graphitization inoculation and inoculation of the metal matrix. The ability to graphitise the liquid alloy decreases with its holding in the furnace, time of pouring into moulds from pouring machines. The tendency to dendritic grains crystallization and the segregation of elements such as Si, Ni and Cu decrease the ductile properties. The austenitizing process can introduce austenite grains growth negatively affecting of the ausferrite morphology. The modifying effect of small amounts of additives on the metal matrix in steel and low alloy cast steel, well known in materials engineering, has been applied to ADI. The addition of cast iron chips, Fe-V and Fe-Nb to the liquid alloy in the first inoculation is an example of a hybrid interaction. The introduction of graphitization nucleus particles and austenite crystallisation nucleus particles resulted in a stabilisation of the ductility of ADI and an increase in mechanical properties. Grains refinement of the primary austenite and precipitation hardening of ausferrite stabilise the mechanical properties of ADI. As a result of graphitization and additive structure inoculation, graphite and ausferrite morphology is improved. The obtained results point the way to further research in the field of hybrid inoculation of Ductile Cast Iron.
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Bibliography

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Authors and Affiliations

A. Zaczyński
1
ORCID: ORCID
M. Królikowski
1
ORCID: ORCID
A. Nowak
1
ORCID: ORCID
M. Sokolnicki
1
ORCID: ORCID
J. Jaroszek
1
A. Burbelko
2
ORCID: ORCID

  1. Odlewnie Polskie S.A., 27-200 Starachowice, inż. Władysława Rogowskiego Street 22, Poland
  2. AGH University of Krakow, Faculty of Foundry Engineering, 23 Reymonta Str., 30-059 Krakow, Poland
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Abstract

The article focuses on the mechanical properties of mould parts created using 3D printing technology, for use in the production of castings by High-Pressure Die Casting (HPDC). The mould shapes produced by 3D printing technology bring innovative approaches to optimising production processes. H13 tool steel is widely used for its excellent mechanical properties and resistance to thermal stress. The study focuses on the comparison of the mechanical properties of mould parts produced by traditional methods and 3D printing, with emphasis on their strength, hardness and wear resistance under repeated working cycles. The experimental part includes roughness measurements and tests of mechanical properties, which provide important data on the ability of these components to withstand high mechanical loads and temperature fluctuations during the HPDC process. The results of the study show the advantages and limitations of 3D printing compared to traditional manufacturing processes and give insight into the use of additive technologies in industrial manufacturing. Specifically, the study identified clear quantitative differences in mechanical properties: the 3D printed mould parts had comparable ultimate tensile strength and yield strength to conventionally manufactured parts, but significantly lower ductility (below 1% compared to about 20% in traditional parts) due to higher porosity (0.25–0.30% compared to 0.03–0.04%). Additive mould parts exhibited higher hardness (approximately 510 HV) compared to conventional parts (approximately 450 HV). Surface roughness of the 3D printed parts was more variable, highlighting the need for optimising printing parameters. Thus, additive technology offers benefits in stable hardness and comparable strength, albeit at the expense of reduced ductility and increased variability in surface quality. The research also includes an analysis of the effect of repetitive loading on the mechanical properties of the mould parts made of H13, which provides valuable information for improving their durability and reliability in practice. This research contributes to the development of 3D printing technologies in the field of HPDC and offers new opportunities for improving the efficiency and quality of manufacturing processes in industrial applications.
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Bibliography

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Authors and Affiliations

M. Pinta
1
ORCID: ORCID
L. Socha
1
ORCID: ORCID
J. Sviželová
1
ORCID: ORCID
L. Kucerova
2
ORCID: ORCID
M. Dvořák
3
J. Häusler
4

  1. Department of Applied Technologies and Materials Research, Institute of Technology and Business in České Budějovice, Okružní 517/10, 370 01 České Budějovice, Czech Republic
  2. Department of Materials and Engineering Metallurgy, Faculty of Mechanical Engineering, University of West Bohemia, Univerzitní 2732/8, 301 00 Plzeň, Czech Republic
  3. Tool Shop Division, MOTOR JIKOV Fostron a.s., Kněžskodvorská 2277, 370 04 České Budějovice, Czech Republic
  4. MOTOR JIKOV Strojírenská a.s., Zátkova 495, 392 01 Soběslav II, Czech Republic
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Abstract

This paper presents the results of research concerning manganese cast steel, also called Hadfield cast steel. The aim of the research was to determine the effect of Ni addition on the usable properties, i.e., hardness and impact resistance of manganese cast steel for cast components of railway crossovers. The scope of the research included making test castings with a unit weight of 1.5 kg in molds from molding sand prepared using Alphaset technology on a chromite sand matrix. The technological process of the test castings included heat treatment, i.e., oversaturation in water from a temperature of 1050°C. The effect of Ni addition from approx. 0,1 to approx. 1,5 wt.% on the usable properties of manganese cast steel were assessed through impact resistance tests performed in a railway impact bending test, Brinell hardness measurements, and microstructure analysis using light optical and scanning electron microscopy. Analysis of the obtained experimental results allowed for the optimization of the chemical composition of manganese cast steel for cast elements of railway infrastructure.
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Authors and Affiliations

T. Wróbel
1 2
ORCID: ORCID
S. Sobula
3
ORCID: ORCID
G. Tęcza
3
ORCID: ORCID
D. Bartocha
1 2
ORCID: ORCID
J. Jezierski
1 2
ORCID: ORCID
K. Kostrzewa
2

  1. Silesian University of Technology, Department of Foundry Engineering, Towarowa 7, 44-100 Gliwice, Poland
  2. Huta Małapanew Sp. z o.o., Kolejowa 1, 46-040 Ozimek, Poland
  3. AGH University of Science and Technology, Department of Alloys and Cast Composites Engineering, Reymonta 23, 30-059 Kraków, Poland
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Abstract

This study investigates the formation and influence of the Fe₂Al₅ intermetallic phase in Al–Fe sintered composites produced via solid-state powder metallurgy. Aluminium–iron powder mixtures containing 25, 29, and 34 at.% Fe were compacted under a pressure of 400 MPa and vacuum-sintered at 580 °C. Microstructural characterisation was performed using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). Image analysis confirmed the presence of three distinct regions: an aluminium matrix, Fe-rich zones, and a newly formed η-phase (Fe₂Al₅). The formation of the Fe₂Al₅ phase was observed locally at the interfaces between the aluminium matrix and iron particles, as a result of solid-state diffusion during sintering. The growth direction of this phase suggests that aluminium diffused into iron, resulting in the formation of reaction layers characteristic of aluminium-rich compositions. XRD analysis revealed no detectable peaks corresponding to FeAl₃ or FeAl₂ phases, confirming that intermetallic phase evolution proceeded entirely in the solid state. Microhardness measurements showed significantly elevated values in Fe₂Al₅-rich regions, highlighting its strengthening potential. The results confirm that Fe₂Al₅ can be effectively synthesised via solid-state diffusion, without liquid phase formation. This approach enables the controlled development of intermetallic phases in Al–Fe systems and offers promising prospects for low-temperature manufacturing of materials with improved mechanical properties.
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Bibliography

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