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Room and high tempe...
Room and high temperature fatigue behaviour of the A354 and C355 (Al-Si-Cu-Mg) alloys : Role of microstructure and heat treatment
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- Ceschini, L. (author)
- University of Bologna
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- Morri, A. (author)
- University of Bologna
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- Toschi, S. (author)
- University of Bologna
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- Seifeddine, Salem (author)
- Jönköping University,JTH. Forskningsmiljö Material och tillverkning – Gjutning
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University of Bologna JTH Forskningsmiljö Material och tillverkning – Gjutning (creator_code:org_t)
- Elsevier, 2016
- 2016
- English.
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In: Materials Science & Engineering. - : Elsevier. - 0921-5093 .- 1873-4936. ; 653, s. 129-138
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Al-Si-Mg alloys are widely used in the automotive industry for the production of engine components. Due to the new stringent emissions standards, these components undergo highertemperatures than in the past; as a result, alloys with higher thermal stability, such as the Al-Si-Cu-Mg, are currently under investigation.The present paper aims at widening the knowledge on the relationship between room temperature (RT) and high temperature fatigue behaviour of A354 and C355 alloys and their microstructural features, in particular, secondary dendrite arm spacing (SDAS) and intermetallic compounds. Samples for fatigue characterization were hot isostatic pressed, aiming to avoid the effect of solidification defects.The results of microstructural analyses and rotating bending fatigue tests highlighted that (i) SDAS influences room temperature fatigue behaviour of the peak-aged A354 and C355 alloys, while its effect on the overaged alloys at high temperature is negligible; (ii) fatigue cracks nucleated mostly from large intermetallic compounds; (iii) at room temperature, C355 alloy is characterized by higher fatigue strength (151 and 135. MPa for fine and coarse SDAS, respectively) in comparison to A354 alloy (133 and 113. MPa); after overaging and testing at high temperature, the behaviour of the two alloys is comparable. A good correlation between ultimate tensile strength and fatigue resistance was found, independent of microstructure and aging condition.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
Keyword
- Casting aluminium alloys
- High temperature fatigue
- Overaging
Publication and Content Type
- ref (subject category)
- art (subject category)
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