Effect of elevated temperature on the fatigue strength of casted AlSi8Cu3 aluminium alloys

Garb, Christian; Leitner, Martin; Grün, Florian

doi:10.1016/j.prostr.2017.11.118

Cited by 10 publications

(9 citation statements)

References 22 publications

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“…The examined materials are two Al-Si cast alloys with Strontium (Sr) as eutectic modifier and post-heat treatments to obtain T5 and T6 condition, see previously performed studies [10,22,23]. The T5 heat treatment consists of a quenching process and subsequent artificial aging whereas the T6 heat treatment usually involves three stages; the solution treatment at high temperatures, the quenching, and the age hardening process [24].…”

Section: Methodsmentioning

confidence: 99%

“…As such cast aluminum components are also exposed to elevated temperatures during service, the characterization of the material properties under these conditions is inevitable. Hence, the material properties of Al-Si cast alloys are investigated under elevated temperatures in a preliminary study [10]. This work extends the investigations from Garb et al [10] by means of sampling positions, the statistical evaluation of fatigue fracture-initiating inhomogeneities and a defect-based fatigue strength model at elevated temperature of 150 • C, which was chosen in this study to reflect typical service conditions [11].…”

Section: Introductionmentioning

confidence: 98%

“…Hence, the material properties of Al-Si cast alloys are investigated under elevated temperatures in a preliminary study [10]. This work extends the investigations from Garb et al [10] by means of sampling positions, the statistical evaluation of fatigue fracture-initiating inhomogeneities and a defect-based fatigue strength model at elevated temperature of 150 • C, which was chosen in this study to reflect typical service conditions [11]. Another study [12] proposed the estimation of fatigue life under enhanced temperatures from tensile test results.…”

Section: Introductionmentioning

confidence: 99%

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Application of a area -Approach for Fatigue Assessment of Cast Aluminum Alloys at Elevated Temperature

Aigner

Garb

Leitner

et al. 2018

Metals

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This paper contributes to the effect of elevated temperature on the fatigue strength of common aluminum cast alloys EN AC-46200 and EN AC-45500. The examination covers both static as well as cyclic fatigue investigations to study the damage mechanism of the as-cast and post-heat-treated alloys. The investigated fracture surfaces suggest a change in crack origin at elevated temperature of 150 ∘ C. At room temperature, most fatigue tests reveal shrinkage-based micro pores as their crack initiation, whereas large slipping areas occur at elevated temperature. Finally, a modified a r e a -based fatigue strength model for elevated temperatures is proposed. The original a r e a model was developed by Murakami and uses the square root of the projected area of fatigue fracture-initiating defects to correlate with the fatigue strength at room temperature. The adopted concept reveals a proper fit for the fatigue assessment of cast Al-Si materials at elevated temperatures; in detail, the slope of the original model according to Murakami should be decreased at higher temperatures as the spatial extent of casting imperfections becomes less dominant at elevated temperatures. This goes along with the increased long crack threshold at higher operating temperature conditions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Application of a area -Approach for Fatigue Assessment of Cast Aluminum Alloys at Elevated Temperature

Aigner

Garb

Leitner

et al. 2018

Metals

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“…An example for the cast AlSi8Cu3 (wt.%) alloy in Figure 15 shows that at 150 • C the fatigue strength decreased by up to 25% for locations within the part, having different local porosity [53]. For the AA7075 alloy, fatigue life reduction factor increased with temperature, reaching a maximum of 44% at 225 • C [54].…”

Section: Assessing Thermal Stability Through Mechanical Propertiesmentioning

confidence: 99%

“…A summary of the stress/cycle S/N curves at room temperature and at 150 °C for a survival probability of 50% of AlSi8Cu3 (wt.%) alloy also listed with the fatigue strength reductions in percentage. It shows that at 150 °C the fatigue strength decreased by up to 25%, depending on location within the part due to porosity; Sa-stress amplitude[53].3.3.7. Challenges with Predicting the Effect of Long Service Time at Increased TemperaturesWhen specifying the maximum service temperature of structural materials a distinction is often made between the intermittent and continuous service.…”

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confidence: 99%

Thermal Stability of Aluminum Alloys

Czerwiński

2020

Materials

132

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Thermal stability, determining the material ability of retaining its properties at required temperatures over extended service time, is becoming the next frontier for aluminum alloys. Its improvement would substantially expand their range of structural applications, especially in automotive and aerospace industries. This report explains the fundamentals of thermal stability; definitions, the properties involved; and the deterioration indicators during thermal/thermomechanical exposures, including an impact of accidental fire, and testing techniques. For individual classes of alloys, efforts aimed at identifying factors stabilizing their microstructure at service temperatures are described. Particular attention is paid to attempts of increasing the current upper service limit of high-temperature grades. In addition to alloying aluminum with a variety of elements to create the thermally stable microstructure, in particular, transition and rare-earth metals, parallel efforts are explored through applying novel routes of alloy processing, such as rapid solidification, powder metallurgy and additive manufacturing, engineering alloys in a liquid state prior to casting, and post-casting treatments. The goal is to overcome the present barriers and to develop novel aluminum alloys with superior properties that are stable across the temperature and time space, required by modern designs.

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Three‐dimensional reconstruction of material micropores based on stereology and fatigue life prediction

Sun

Cheng

Zhang

et al. 2020

Materialwissenschaft Werkst

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In this paper, the fatigue life of Al‐Zn713 alloy castings was studied. Based on stereological theory and finite element method, a new idea of material fatigue life prediction was proposed. Goldsmith‐Cruz‐Orive method was used to reconstruct the three‐dimensional distribution of micropores that based on the two‐dimensional distribution information. The stress analysis of the reconstructed three‐dimensional geometric model was carried out by finite element method. Combining with the modified Coffin‐Manson formula, a material fatigue life prediction system based on the distribution of micropores was established, which opened up a new direction for the research of material fatigue behavior and fatigue life.

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Effect of elevated temperature on the fatigue strength of casted AlSi8Cu3 aluminium alloys

Cited by 10 publications

References 22 publications

Application of a area -Approach for Fatigue Assessment of Cast Aluminum Alloys at Elevated Temperature

Application of a area -Approach for Fatigue Assessment of Cast Aluminum Alloys at Elevated Temperature

Thermal Stability of Aluminum Alloys

Three‐dimensional reconstruction of material micropores based on stereology and fatigue life prediction

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