Low cycle thermal fatigue of aluminum alloy cylinder head in consideration of changing metrology microstructure

Tsuyoshi-Takahashi,; Sasaki, Katsuhiko

doi:10.1016/j.proeng.2010.03.083

Cited by 56 publications

(14 citation statements)

References 5 publications

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“…Several studies were conducted to understand the fatigue behavior of aluminum alloys over the years, especially on age-hardening aluminum alloys, such as the 2xxx and 7xxx alloys [1,2,[6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Overaging on the Cyclic Deformation Behavior of an AA6061 Aluminum Alloy

Liu

Mirza

Chen

2018

Metals

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The present work encompasses the effect of overaging on the strain-controlled low-cycle fatigue (LCF) behavior of an extruded AA6061 aluminum alloy at varying strain amplitudes. During the T7 aging treatment, the size of precipitates increased from 60 nm under T6 conditions to 220 nm after aging for 48 h at 200 • C, leading to a decrease in the monotonic tensile strength. During the LCF tests, nearly symmetrical hysteresis loops can be observed in the mid-life cycle under all test conditions, whereas the first-cycle hysteresis loops were moderately inflected under long-aging conditions. With increasing aging time, the cyclic peak stresses decreased and the plastic strain increased. Nearly ideal Masing behavior was exhibited under T6 conditions, while it was lost under T7 overaging conditions. The cyclic stress responses were similar under all tested conditions, involving stabilization at low strain amplitudes and softening at high strain amplitudes, with initial hardening for the first few cycles. Compared to the T6 condition, the fatigue life increased with increasing T7 aging time. Various LCF parameters were estimated based on the Coffin-Manson and Basquin relationships and on the LCF experimental results. The relationship between the fatigue life, strength, and microstructure of the investigated AA6061 aluminum alloy under various aging conditions was discussed.

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Section: Introductionmentioning

confidence: 99%

Effect of Overaging on the Cyclic Deformation Behavior of an AA6061 Aluminum Alloy

Liu

Mirza

Chen

2018

Metals

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“…Low-cycle fatigue testing has been widely employed to evaluate the fatigue properties of Al alloy cylinder heads. 12,13 Generally, low-cycle fatigue test is conducted in a strain controlled mode without change in temperature. By analysing the stress-strain hysteresis loop, the elastic and plastic strain components are separated for a given mechanical strain range.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical studies on thermo‐mechanical fatigue test for aluminium cast alloy

Zhang

Wang

Han³

et al. 2019

Fatigue Fract Eng Mat Struct

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Evaluation of the thermo‐mechanical behaviour and prediction of the service life of cast aluminium alloys are important for the design of automobile engine cylinder heads. In this study, cast Al alloy specimens are extracted from cylinder heads and subjected to in‐phase thermo‐mechanical cyclic loading. The hysteresis curves related to stress and strain were recorded under the individual thermo‐mechanical loading conditions. The number cycles to failure corresponding to multiple mechanical strain and temperature ranges were obtained. It is found that the cyclic stress amplitude decreases and the cyclic softening rate increases with increasing maximum temperature rise. A modified fatigue‐creep model based on energy conservation has been developed for prediction of the fatigue life of cylinder heads. The proposed method shows good agreement with the well‐established Ostergren model and low standard deviations. In summary, the proposed method described in this study provides an option for prediction of the thermo‐mechanical behaviour of metals.

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“…As this alloy comprises a good part of the overall casted products using bulk [3][4][5][6][7] or composite [8][9][10][11] forms, there is a continuous research dedicated to its development and characterization. There has been significant research concerning the A356 α-Al primary dendrites [1,2,12,13], eutectic Si [14][15][16][17], main secondary phases (β-Al 5 Fe 2 Si, and π-Al 8 FeMg 3 Si 6 ) [18][19][20][21] and heat treatments, such as solution [17,22,23] and ageing [24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Heat treatment as a route to tailor the yield-damping properties in A356 alloys

Carneiro¹,

Puga²,

Meireles³

2018

Materials Science and Engineering: A

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A356 is a common industrial alloy due to its relatively good mechanical properties, reduced weight and capability be casted into complex structures. However, in order to display good static mechanical properties (e.g. elevated yield strength) it must be heat treated (usually T6), therefore, compromising its dynamic properties (e.g. damping ratio). This study analyses the role of such heat treatments in the overall microstructure of A356 poured in ceramic block, associating the morphology transformations with the internal mechanisms that enhance yield strength and reduce damping. It is suggested that these variables display an inverse proportionality and a linear model is determined for the design of alloys with tailored yield/damping by the use of different artificial ageing times. Methodology2.1. Alloy casting, heat treatment and sample production A356 alloy study was received in the form of 12.5 kg ingots with the chemical composition shown in Table 1. Melting of 0.3 kg of alloy was

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Low cycle thermal fatigue of aluminum alloy cylinder head in consideration of changing metrology microstructure

Cited by 56 publications

References 5 publications

Effect of Overaging on the Cyclic Deformation Behavior of an AA6061 Aluminum Alloy

Effect of Overaging on the Cyclic Deformation Behavior of an AA6061 Aluminum Alloy

Experimental and theoretical studies on thermo‐mechanical fatigue test for aluminium cast alloy

Heat treatment as a route to tailor the yield-damping properties in A356 alloys

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