Fatigue and fatigue crack propagation in AlSi7Mg cast alloys under in-service loading conditions

Stanzl-Tschegg, Stefanie E.; Mayer, H.; Beste, A.; Kroll, S.

doi:10.1016/0142-1123(95)95895-n

Cited by 51 publications

(26 citation statements)

References 7 publications

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“…There is no obvious correlation between microstructure, static properties and fatigue properties [12]. For example, heat treatment modifies the eutectic silicon morphology and the alpha phase hardness and has a strong influence on the yield strength of Al-Si-Mg alloys but it was found to have a limited effect on the alloy fatigue strength [3,5,8].…”

Section: Introductionmentioning

confidence: 99%

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High cycle fatigue strength of permanent mold and rheocast aluminum 357 alloy

Brochu

Verreman

Ajersch

et al. 2010

International Journal of Fatigue

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The high cycle fatigue resistances of aluminum-silicium-magnesium 357 alloy prepared by semi-solid forming (SSM) and conventional permanent mold casting (PM) are compared under fully reversed loading. Results, reported in S-N diagrams, show that rheocasting improves the as-cast alloy mean fatigue strength, by 36% at 10 7 cycles. Part of this improvement is explained by the fact that more SSM specimens are defect free than PM specimens. Comparison of the S-N diagrams also reveals that precipitation hardening slightly increases the fatigue strengths of the PM and SSM alloys, and that eutectic modification has no effect on the fatigue performance of the SSM alloy. Observation of small cracks using replicas shows the existence of crack growth decelerations at grain boundaries. No similar decelerations are observed when the crack enters a new a-Al cell within a grain. According to these results, it is proposed that in the absence of defects, the fatigue strength of aluminum alloy 357 is a function of the grain size (D) rather than of the secondary dendrite arm spacing (SDAS) or the spherical diameter of the alpha phase globules (u sph ). Thus, it is concluded that the fatigue strength improvement of the SSM alloy is also related to the smaller grain of the rheocast specimens.

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Section: Introductionmentioning

confidence: 99%

“…For conventionally cast specimens, shrinkage cavities have been most frequently observed at the crack initiation sites [4,5,8,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

High cycle fatigue strength of permanent mold and rheocast aluminum 357 alloy

Brochu

Verreman

Ajersch

et al. 2010

International Journal of Fatigue

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show abstract

“…In this case, however, the difference between the diagrams of the former standard and the recently elaborated fatigue results for a failure probability of 10 % is not very significant. This can be explained by the surface condition of the stainless steel wires Results of an ultra-high-cycle fatigue test on helical compression springs The so called "fatigue limit" has currently become the object of numerous discussions and more recent investigations [25][26][27], e.g. through ultrasonic fatigue tests.…”

Section: Determination Of Goodman-diagrams For Highly Stressed Helicamentioning

confidence: 99%

Fatigue behaviour of technical springs

Kaiser

Berger

2005

Materialwissenschaft Werkst

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Technical Springs belong to the components with the highest cyclic and superposed static load. Nevertheless they have to fulfill the requirements of lightweight constructions. This is only possible, if high strength materials with special properties are carefully manufactured to well designed springs and special additional treatments are carried out, which impose an advantageous residual stress profile in the surface layers of the springs. After a short historical view on the spring research activities in Professor Thums area, some aspects of the fatigue behaviour of hot formed parabolic leaf springs are presented. Then the fatigue properties of cold formed helical compression springs made of different steel spring wires are discussed. Finally some results on the fatigue behaviour of helical springs at a very high number of load cycles are reported.Keywords: Hot and cold formed springs, parabolic leaf springs, helical springs, fatigue behaviour, very high cycle fatigue, spring materials, shot peening, stress peening, pre-setting.

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“…Stanzl-Tschegg et al 49 studied the effect of microporosity on fatigue crack initiation and propagation in AlSi7Mg cast alloy at very high (10 8 - 10 9 ) numbers of cycles. They concluded that crack initiation sites are casting voids, which lead to stress concentrations.…”

Section: Effect Of Porosity On Fatigue Properties Of Al-si Casting Almentioning

confidence: 99%

Effet des imperfections de la coulée sur les propriétés en fatigue des alliages de fonderie aluminium silicium /

Ammar¹

2006

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Fatigue and fatigue crack propagation in AlSi7Mg cast alloys under in-service loading conditions

Cited by 51 publications

References 7 publications

High cycle fatigue strength of permanent mold and rheocast aluminum 357 alloy

High cycle fatigue strength of permanent mold and rheocast aluminum 357 alloy

Fatigue behaviour of technical springs

Effet des imperfections de la coulée sur les propriétés en fatigue des alliages de fonderie aluminium silicium /

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