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Jarfors, Anders E.W.ORCID iD iconorcid.org/0000-0002-0101-0062
Alternative names
Publications (10 of 233) Show all publications
Bogdanoff, T., Tiryakioglu, M., Jarfors, A. E. .. & Ghassemali, E. (2024). A simple procedure to assess the Complete Melt Quality in aluminium castings: implementation in a die-casting and a rheo-casting. International Journal of Cast Metals Research, 37(1), 71-79
Open this publication in new window or tab >>A simple procedure to assess the Complete Melt Quality in aluminium castings: implementation in a die-casting and a rheo-casting
2024 (English)In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 37, no 1, p. 71-79Article in journal (Refereed) Published
Abstract [en]

A new simple approach was developed to assess the Complete Melt Quality of aluminium cast alloys throughout the production line. The approach relies on the concurrent use of reduced pressure tests (RPT) and tensile tests at each station in the production line when the melt is transferred and/or processed. These tests can be used to determine the source of melt-related problems in the production line. Two case studies from the procedure of both an aluminium die-casting and a rheo-casting plant showed that melts were significantly damaged in the tower furnace and got progressively more damaged through the production line proven by the RPT, tensile test, and fracture surface analysis results.

Place, publisher, year, edition, pages
Taylor & Francis, 2024
Keywords
Melt transfers, bifilms, degassing, liquid metal damage, porosity
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-63218 (URN)10.1080/13640461.2023.2293415 (DOI)001125756600001 ()2-s2.0-85179712295 (Scopus ID);intsam;924887 (Local ID);intsam;924887 (Archive number);intsam;924887 (OAI)
Funder
VinnovaKnowledge Foundation
Available from: 2024-01-08 Created: 2024-01-08 Last updated: 2024-01-08Bibliographically approved
Bogdanoff, T., Ghassemali, E., Jarfors, A. E. .. & Seifeddine, S. (2024). The impact of HIP process and heat treatment on the mechanical behaviour of an Al–Si–Mg alloy component. International Journal of metalcasting
Open this publication in new window or tab >>The impact of HIP process and heat treatment on the mechanical behaviour of an Al–Si–Mg alloy component
2024 (English)In: International Journal of metalcasting, ISSN 1939-5981, E-ISSN 2163-3193Article in journal (Refereed) Epub ahead of print
Abstract [en]

This study investigates the effect of hot isostatic pressing (HIPping) on the static and fatigue properties of sand-casting A356 aluminium alloys. HIPping is a method to improve the fatigue properties in aluminium cast material by reducing or eliminating the inner porosities. Investigation of the complex interaction between the microstructural features on mechanical properties before and after the HIPping process was examined using computed tomography and scanning electron microscopy (SEM). Castings generally contain pores and defects that have a detrimental impact on the fatigue properties. The HIPping process closes the porosities in all investigated samples with an increase in density. Without significant defects, the mechanical performance improved in the finer microstructure. However, a considerable variation in the results was found between the different conditions, whereas the coarser microstructure with larger porosities before HIPping showed remarkably reduced results. The high-cycle fatigue-tested samples showed reduced fatigue propagation zone in the coarser microstructure. Moreover, large cleavage areas containing bifilms in the fracture surfaces indicate that the healing process of porosities is inefficient. These porosities are closed but not healed, resulting in a detrimental effect on the static and dynamic properties.

Place, publisher, year, edition, pages
Springer, 2024
Keywords
Al–Si alloys, castings, fatigue properties, heat treatment, hot isostatic pressing (HIP), Aluminum alloys, Computerized tomography, Defects, Fatigue testing, High-cycle fatigue, Magnesium alloys, Microstructure, Porosity, Scanning electron microscopy, Silicon alloys, Sintering, Al-Si alloy, Al-si-mg alloys, Alloy components, Coarse microstructure, Hot isostatic pressing, Hot-isostatic pressings, Mechanical behavior, Sand-castings, Static properties
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-63436 (URN)10.1007/s40962-023-01226-z (DOI)001141893800001 ()2-s2.0-85182182478 (Scopus ID)HOA;;933494 (Local ID)HOA;;933494 (Archive number)HOA;;933494 (OAI)
Available from: 2024-01-29 Created: 2024-01-29 Last updated: 2024-01-31
Jones, C. A., Jarfors, A. E. .., Rogers, E., Vrethed, P., Silva, P. & Jolly, M. R. (2023). A mathematical examination of the impact of mould transparency to infrared radiation on solidification during the investment casting process. Paper presented at 16th International Conference on Modelling of Casting, Welding and Advanced Solidification Processes (MCWASP 2023), 18–23 June 2023, Banff, Canada. IOP Conference Series: Materials Science and Engineering, 1281(1), Article ID 012040.
Open this publication in new window or tab >>A mathematical examination of the impact of mould transparency to infrared radiation on solidification during the investment casting process
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2023 (English)In: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 1281, no 1, article id 012040Article in journal (Refereed) Published
Abstract [en]

Investment casting is a highly dynamic process during which multiple competing physical phenomena are at work. Those seeking to understand and simulate such processes computationally are confronted with a considerable task, balancing accuracy with efficiency. Approximations and models based on well-understood and documented fundamental physics are powerful tools in a modeller’s arsenal. Driven by observed discrepancies between experimental thermocouple measurements and simulation predictions of casting temperatures, this work explores the additional alloy cooling mechanism of mould transparency to infrared radiation, targeting a new mathematical approximation applicable in such situations. Direct attenuation, scattering from coarse sand, sand distribution in the mould and material temperatures play a role in the extent of radiation transparency that must be considered. From this model, estimation of the additional cooling rate resulting from expected mould transparency can be determined and applied as a corrective measure to computation fluid dynamics (CFD) simulation results that do not capture this phenomenon.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2023
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-63228 (URN)10.1088/1757-899X/1281/1/012040 (DOI)POA;intsam;63228 (Local ID)POA;intsam;63228 (Archive number)POA;intsam;63228 (OAI)
Conference
16th International Conference on Modelling of Casting, Welding and Advanced Solidification Processes (MCWASP 2023), 18–23 June 2023, Banff, Canada
Available from: 2024-01-09 Created: 2024-01-09 Last updated: 2024-01-09Bibliographically approved
Lattanzi, L., Awe, S. A., Jansson, P., Rudenstam, C., Westergård, R. & Jarfors, A. E. .. (2023). Aluminium matrix composites for lightweight components. In: : . Paper presented at 17th European Congress and Exhibition on Advance Materials and Processes, FEMS EUROMAT 2023, 03-07 September 2023, Germany.
Open this publication in new window or tab >>Aluminium matrix composites for lightweight components
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2023 (English)Conference paper, Oral presentation only (Refereed)
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-63233 (URN)
Conference
17th European Congress and Exhibition on Advance Materials and Processes, FEMS EUROMAT 2023, 03-07 September 2023, Germany
Available from: 2024-01-09 Created: 2024-01-09 Last updated: 2024-01-09Bibliographically approved
Jarfors, A. E. .. (2023). Aluminium MMC bromsskivor: Lösningen för att få stopp på utsläpp. Aluminium Scandinavia (4), 30-31
Open this publication in new window or tab >>Aluminium MMC bromsskivor: Lösningen för att få stopp på utsläpp
2023 (Swedish)In: Aluminium Scandinavia, no 4, p. 30-31Article in journal (Other (popular science, discussion, etc.)) Published
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-63283 (URN)
Available from: 2024-01-10 Created: 2024-01-10 Last updated: 2024-01-10Bibliographically approved
Jarfors, A. E. .. (2023). Current state of semisolid processing. In: : . Paper presented at 17th International Conference on Semi Solid Processing of Alloys and Composites (S2P2023), 6-8 September 2023, Brescia, Italy.
Open this publication in new window or tab >>Current state of semisolid processing
2023 (English)Conference paper, Oral presentation only (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-63237 (URN)
Conference
17th International Conference on Semi Solid Processing of Alloys and Composites (S2P2023), 6-8 September 2023, Brescia, Italy
Note

Keynote speech.

Available from: 2024-01-09 Created: 2024-01-09 Last updated: 2024-01-09Bibliographically approved
Zhang, Q., Liljenfors, T., Jansson, S., Jonsson, S. & Jarfors, A. E. .. (2023). Effect of Na-based flux on melt quality assessment of 46,000 alloys. Journal of Materials Research and Technology, 27, 1830-1842
Open this publication in new window or tab >>Effect of Na-based flux on melt quality assessment of 46,000 alloys
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2023 (English)In: Journal of Materials Research and Technology, ISSN 2238-7854, Vol. 27, p. 1830-1842Article in journal (Refereed) Published
Abstract [en]

The influence of Na-Based flux on the melt quality assessment was studied using Density index (DI), bifilm index (BI) and tensile test. The melt was prepared with scrap and ingot with and/or without the addition of Na-based flux. The results show that the addition of Na-based flux decreases the accuracy of the correlation between BI/DI and the hydrogen content due to the increased shrinkage pores. The addition of flux promotes the formation of shrinkage pores by either altering the eutectic solidification behavior or generating more and bigger oxide films which leads to insufficient feeding. Moreover, the addition of flux improves the ductility of specimens by modifying the eutectic phase rather than improving the melt quality.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Bifilm index, Flux, Melt quality, Reduced pressure test, Shrinkage, Tensile test, Eutectics, Oxide films, Solidification, Tensile testing, Bifilm indices, Density index, Eutectic solidification, Hydrogen contents, Quality assessment, Shrinkage pores, Solidification behaviors
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-62753 (URN)10.1016/j.jmrt.2023.10.064 (DOI)2-s2.0-85173992786 (Scopus ID)HOA;;911832 (Local ID)HOA;;911832 (Archive number)HOA;;911832 (OAI)
Funder
Vinnova, 2020-013651
Available from: 2023-10-23 Created: 2023-10-23 Last updated: 2023-11-22Bibliographically approved
Li, Z., Tan, H., Jarfors, A. E. .., Lattanzi, L. & Jansson, P. (2023). Enhancing Rheocasting Process Control with AI-based Systems. In: : . Paper presented at The 35th Swedish Artificial Intelligence Society (SAIS'23) annual workshop.
Open this publication in new window or tab >>Enhancing Rheocasting Process Control with AI-based Systems
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2023 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Semisolid casting has emerged as an attractivealternative to conventional casting methods due to its potentialto yield superior mechanical properties, reduce environmentalpollution, and decrease production costs. However, optimizingprocess parameters and controlling the casting process remainschallenging. Process control largely relies on human expertise,associated with significant time and cost expenditures. Inresponse, this study presents a third-circle research project toinvestigate the correlation between the casting process and thesolidification process. The study proposes leveraging AI technologyto digitize the entire process control, thereby increasing thereliability and stability of cast products’ quality. The researchwill focus on understanding the key factors influencing thecasting process and developing an AI-based decision supportsystem to aid in process parameter selection and optimization.The outcomes of this study are expected to contribute to thedevelopment of more reliable and efficient semisolid castingprocesses.

Keywords
semisolid casting, casting process control, AI application
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-62235 (URN)
Conference
The 35th Swedish Artificial Intelligence Society (SAIS'23) annual workshop
Funder
Knowledge Foundation, 2020-0044.
Available from: 2023-08-22 Created: 2023-08-22 Last updated: 2023-08-22
Matsushita, T., Zamani, M., Kump, A. & Jarfors, A. E. .. (2023). Evaluation of the Critical Times for the Crack Susceptibility Coefficient Calculation. International Journal of metalcasting
Open this publication in new window or tab >>Evaluation of the Critical Times for the Crack Susceptibility Coefficient Calculation
2023 (English)In: International Journal of metalcasting, ISSN 1939-5981, E-ISSN 2163-3193Article in journal (Refereed) Epub ahead of print
Abstract [en]

The objective of the present study is to evaluate the hot tearing tendency based on the Clyne and Davies model by evaluating the critical times which can be obtained using a newly developed method. A method to determine the critical times required to calculate the crack susceptibility was presented based on the measurement results with Al–Si alloys, and the method to calculate the crack susceptibility coefficient was presented. In the newly developed method named “Signal intensity method,” signals were generated by tapping the edge of a waveguide which is immersed in molten and solidifying sample and the critical solid fractions were obtained from the signal intensity change. The conventional thermal analysis was also performed simultaneously and the corresponding critical points were identified. The method shown in the present study will enable the determination of the crack susceptibility coefficient with higher accuracy.

Place, publisher, year, edition, pages
Springer, 2023
Keywords
aluminium alloys, crack susceptibility coefficient, hot tear, signal intensity, Aluminum alloys, Silicon alloys, Al-Si alloy, Crack susceptibilities, Critical time, Hot tearing, Hot tears, Intensity change, Intensity methods, Signal intensities, Solids fraction, Thermoanalysis
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-62257 (URN)10.1007/s40962-023-01083-w (DOI)001043356400002 ()2-s2.0-85166987207 (Scopus ID)HOA;;898172 (Local ID)HOA;;898172 (Archive number)HOA;;898172 (OAI)
Funder
Knowledge Foundation, 20180192
Available from: 2023-08-23 Created: 2023-08-23 Last updated: 2023-09-04
Zhang, Q., Jonsson, S. & Jarfors, A. E. .. (2023). Four-point bending fatigue behavior of rheocast AlSi7Mg0.3 alloy: Role of the surface liquid segregation. International Journal of Fatigue, 175, Article ID 107791.
Open this publication in new window or tab >>Four-point bending fatigue behavior of rheocast AlSi7Mg0.3 alloy: Role of the surface liquid segregation
2023 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 175, article id 107791Article in journal (Refereed) Published
Abstract [en]

The surface liquid segregation (SLS) layer in semisolid casting presents higher hardness than the surface of specimens cast using high-pressure die casting (HPDC). Bending fatigue tests showed that semisolid castings present better fatigue properties at higher stress, and this improvement disappears when the applied stress is lower than a critical load. This is because HPDC and SSM castings share the same surface deformation at low stress. More significant deformation is observed for HPDC castings when the stress exceeds the critical load. The presence of surface defects enlarges the difference in deformation at high stress and reduces the critical load.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Four-point fatigue test, Porosity, Semisolid casting, Surface liquid segregation, Bending tests, Die casting, Surface defects, Surface segregation, Bending fatigue, Critical load, Four-point, Four-point-bending, High pressure die casting, High stress, Liquid segregation, Semi solid casting, Fatigue testing
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-62117 (URN)10.1016/j.ijfatigue.2023.107791 (DOI)001037651200001 ()2-s2.0-85163463234 (Scopus ID)HOA;;895947 (Local ID)HOA;;895947 (Archive number)HOA;;895947 (OAI)
Funder
Vinnova, 2018-02831
Available from: 2023-08-15 Created: 2023-08-15 Last updated: 2023-11-22Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0101-0062

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