Effects of Dendrite Cell Size and Eutectic Si Particle Morphology on Fatigue Crack Growth in Cast and HIPed AC4CH Alloys

Kumai, Shinji; Aoki, Saiko; Han, Sang-Won; Sato, Akira

doi:10.2320/matertrans1989.40.685

Cited by 19 publications

(14 citation statements)

References 6 publications

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“…At the fatigue crack tip, large acicular Si particles yield a high-strengthened matrix for the following reasons. Even if the volume fraction of Si particles is the same in both specimens, the gaps among the acicular Si particles allow numerous slip band pile-ups with shorter slip band length, which brings about an elevated yield strength [17,18]. Thus, the fatigue crack grows more slowly over the strengthened alloy with acicular Si particles.…”

Section: The Effect Of Eutectic Si Shape On the Fatigue Crack Growthmentioning

confidence: 98%

“…If the acicular Si particles do not severely crack in low ΔK, the particles increase the strength of plastic zone. Furthermore, the acicular Si particles promote deflection of fatigue crack [18]. These effects of acicular Si particles result in low fatigue crack growth rates for the low ΔK region.…”

Section: The Effect Of Eutectic Si Shape On the Fatigue Crack Growthmentioning

confidence: 99%

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Fatigue crack growth behaviors in Al−Si−Mg sand cast alloys

Han

Kim

2004

Met. Mater. Int.

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The fatigue crack growth behavior of Al-Si-Mg sand cast alloys has been investigated with reference to the effects of solidification structure and aging condition. Fatigue crack growth tests have been carried out under constant load amplitude and a stress ratio of R=0.1 using CT specimens. The amount of pores in the matrix was limited by performing HIP treatment. The pores tended to promote deflection of fatigue cracks, which decreased the fatigue crack growth rate at low ΔK regions and increased the number of cycles until final fatigue fracture. Refining and spheroidizing of eutectic Si particles increased the fatigue crack growth rates over a wide range of ΔK up to larger ΔK values. The difference of aging conditions significantly affected the da/dN-ΔK eff relationship.

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Section: The Effect Of Eutectic Si Shape On the Fatigue Crack Growthmentioning

confidence: 98%

Section: The Effect Of Eutectic Si Shape On the Fatigue Crack Growthmentioning

confidence: 99%

Fatigue crack growth behaviors in Al−Si−Mg sand cast alloys

Han

Kim

2004

Met. Mater. Int.

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“…5,8 Because of the absence of casting defects, the fatigue life of A319 alloy is strongly dependent on the value of SDAS, morphology, and distribution of eutectic Si particles. With the increasing of porosity, the fatigue life decreases.…”

Section: Relating Fatigue Parameters With Microstructure Characterimentioning

confidence: 99%

“…However, these components are usually subject to cyclic loadings during service which can cause initiation of fatigue crack, as well as failure of the whole structure. Kumai 8 investigated the growth and closure of fatigue crack in Al-Si alloy by performing fatigue crack growth tests on structurally variable AC4CH alloys with different casting methods and modification conditions. [4][5][6][7] Among all affecting factors, solidification cooling rate and modification of eutectic Si particles play an important role in controlling microstructure of Al-Si casting alloys which is closely related to alloy's properties.…”

Section: Introductionmentioning

confidence: 99%

Quantitative relationship between microstructure characteristics and fatigue parameters of A319 casting alloy

Liu

et al. 2019

Fatigue Fract Eng Mat Struct

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This paper describes a microstructure-based uniaxial strain-controlled fatigue life prediction model applied to A319 aluminum alloy which is widely used in automobile industry. The materials made with different casting conditions are characterized and quantified in terms of secondary dendrite arm spacing (SDAS), size, and aspect ratio of eutectic Si particles. Uniaxial low cycle fatigue tests have been performed on four groups of A319 alloy under different casting conditions in which cooling rate and Sr addition are variables. It is shown that the effect of various degrees of microstructure on the fatigue life and fatigue behavior is obvious. The first part of the paper is quantitatively characterizing the microstructure of samples to identify the influence of different casting conditions. With regard to mechanic properties, the tensile properties and fatigue behavior of samples are analyzed combining with microstructure. Finally, a microstructure-based Manson-Coffin-Basquin model is proposed to predict fatigue life of Al-Si alloy.

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“…Since Al-Si-Mg cast alloys have some advantages of high strength, net-near shaping and low cost, their usage, rather than the usage of extruded or extended alloys, is expected to expand as construction materials of transportation machines. But for expanding the usage, the effects of solidification structure on fatigue endurance should be precisely examined [4][5].…”

Section: Introductionmentioning

confidence: 99%

Effects of solidification structure on fatigue crack initiation and fatigue strength in Al−Si−Mg cast alloys

2002

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Rotating-bending uniaxial fatigue tests and micro-fatigue crack initiation tests were carried out using a permanent mold cast (PMC) and semi-solid die cast (SDC) with Al-7%Si-0.35%Mg composition in order to examine the relationship between solidification structures and fatigue behaviors. The crack length was measured using a replication method. Fatigue strength was improved in SDC, which was almost consistent with the predicted fatigue strength using the size of Si particle cluster. Resistance to fatigue crack initiation and fatigue strength were improved in SDC owing to the finer Si cluster and to higher ultimate tensile strength. Fatigue crack in PMC was preferentially initiated at pores. For SDC, the fatigue crack was initiated at the Si particle/ matrix interface, and then sucessively grew along eutectic cell boundaries.

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Effects of Dendrite Cell Size and Eutectic Si Particle Morphology on Fatigue Crack Growth in Cast and HIPed AC4CH Alloys

Cited by 19 publications

References 6 publications

Fatigue crack growth behaviors in Al−Si−Mg sand cast alloys

Fatigue crack growth behaviors in Al−Si−Mg sand cast alloys

Quantitative relationship between microstructure characteristics and fatigue parameters of A319 casting alloy

Effects of solidification structure on fatigue crack initiation and fatigue strength in Al−Si−Mg cast alloys

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