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Influence of stirring process during slurry formation on the casting defects and high-temperature fatigue of rheocast AlSi7Mg alloys
Department of Management and Engineering, University of Padova, Vicenza, Italy.
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-0431-4352
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-0101-0062
Department of Management and Engineering, University of Padova, Vicenza, Italy.
2023 (English)In: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 1274, no 1, article id 012024Article in journal (Refereed) Published
Abstract [en]

The effects of the stirring phase during slurry formation on the defect’s content and the influence on the high-temperature fatigue behaviour of a rheocast AlSi7Mg alloy were investigated. Single or double-stir step was used during RheoMetal processing. Metallographic and image analysis techniques were performed to quantitatively examine the defect’s changes occurring with different stirring methods. Samples were cross-sectioned along the gauge length, and the pores content was measured. Uniaxial fatigue tests were performed at high temperature (150 °C) with the staircase method, applying a stress ratio of R = −1. Fracture surfaces were examined using a scanning electron microscope to determine the fatigue crack initiation sites, type and size of the defects. Shrinkage porosity has more probability of acting as a crack initiator than gas porosity or oxides. The double-stir step effectively reduces the size of pores compared to the conventional technique; it reduces porosity to less than half if compared to the single-stir process. Shrinkage pores distribution show a higher population of smaller pores for the double-stir process. According to the Dixon-Mood formula, the mean fatigue strengths are comparable. The capability of the double-stir to reduce porosity is evident, even having no significant effect on the high-temperature fatigue life.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2023. Vol. 1274, no 1, article id 012024
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-63251DOI: 10.1088/1757-899X/1274/1/012024Local ID: POA;intsam;926004OAI: oai:DiVA.org:hj-63251DiVA, id: diva2:1825544
Conference
6th International Conference on Advances in Solidification Processes (ICASP-6), 19–24 2022, Le Bischenberg, France
Available from: 2024-01-09 Created: 2024-01-09 Last updated: 2024-01-09Bibliographically approved

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Zhang, QingJarfors, Anders E.W.

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