Effects of cooling rate on solution heat treatment of as-cast A356 alloy

Yang, Changlin; Li, Yuan-bing; Dang, Bo; Lü, He-bin; Liu, Feng

doi:10.1016/s1003-6326(15)63952-8

Cited by 38 publications

(33 citation statements)

References 15 publications

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“…Shivkumar [11] found that for A356 alloy, a solution heat treatment of only 50 min at 540 °C was https://doi.org/10.1007/s41230-018-7058-x sufficient to obtain a homogeneous distribution of Si and Mg in α-Al matrix. Yang C L, et al [12] found the solution time could be reduced to about 30 min. In general, the eutectic Si will undergo three successive steps during heat treatment: disintegration, spheroidization and coarsening [13] .…”

Section: Introductionmentioning

confidence: 99%

“…Obviously, there are two opposite views about the time of solution heat treatment: one thinks that a long period time of solution heat treatment is essential, the other believes that the time of solution heat treatment can be greatly reduced. However, these studies [11][12][13][14] concerning short-term heat treatment mainly focus on the evaluation of the microstructure, but ignore the relationship between the microstructure and mechanical properties, especially the influence on tensile strength and ductility. Furthermore, the different results between two kinds of heat treatment and the reasons for these results require further investigation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A new fast heat treatment process for cast A356 alloy motorcycle wheel hubs

Lu¹,

Liu³

et al. 2018

China Foundry

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A 356 cast alloy has been widely used in automotive and aircraft industries owing to its outstanding properties, such as good castability, low density, high corrosion resistance and good weldability [1][2] .Moreover, A356 aluminum alloy has often been used as the material for motorbike wheel hubs [3] . With the requirement for larger delivery capacity, wheel hubs for motorcycles are becoming wider with more complex shapes. As an important part of the motorbike, strict quality rules for the mechanical properties of the wheel hub have been issued to ensure the security of the vehicles. However, as a typical hypoeutectic Al-Si alloy, the as-cast A356 alloy consists of coarse primary α-Al dendrites and needle-shape eutectic silicon, which lowers severely the alloy's mechanical properties [4] . It is known that the mechanical properties are determined by controlling the microstructures of the alloys. Heat treatment is a common means for the spheroidization of the eutectic silicon [5,6] . Therefore, it is vital to control the microstructures of A356 alloy through heat treatment to improve the mechanical properties of the castings. Abstract:The normal T6 heat treatment process for cast A356 alloy generally requires about 15 h. This longperiod procedure increases greatly the manufacturing cost and decreases the productivity in practical production. In this study, a new short-time heat treatment process with only 30 min solution time at 540 °C was developed for the production of motorcycle wheel hubs in order to reduce heat treatment time. Comparisons on microstructure evaluation and mechanical properties, such as tensile strength and ductility, were made between this new fast process and the conventional T6 heat treatment. The results revealed that this new heat treatment process enabled the spheroidization of the eutectic silicon thoroughly, while minimizing the growth of eutectic silicon. The A356 alloy after this new short-time heat treatment shows nearly equal mechanical properties compared with the same alloy heat treated in a normal T6 heat treatment. This investigation makes it possible to significantly improve the efficiency of heat treatment on A356 alloy and, at the same time, improve the mechanical properties of the alloy. Conventional T6 heat treatment, which includes a solution treatment process followed by rapid quenching and an aging process, has been well understood. During this procedure, alloying elements are dissolved into α-Al crystals to form the supersaturated solid solution. After that, intermetallics precipitate from the matrix in the form of β", β' or β among the annealing process, decided by aging time and temperature [7] . As for A356 alloy, belonging to the Al-Si-Mg ternary alloy system, precipitation strengthening may mainly attribute to Mg 2 Si (i.e., β phase) precipitation [8] . Zhang et al [9] reported that Mg 2 Si phase in A356would be dissolved completely at 540 °C in only half an hour, but the spheroidization of eutectic silicon and homogenization of α-Al dendrites generally need a lon...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new fast heat treatment process for cast A356 alloy motorcycle wheel hubs

Lu¹,

Liu³

et al. 2018

China Foundry

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“…A few authors have discussed the characteristics of A356 alloy as well as reinforcements when mixed with organic materials in view as reinforcements. The extant literature revealed a generous number of approaches that have been used to produce A356 composites, primarily solution heat treatment and age hardening [16]. A review of the literature is as follows.…”

Section: Literature Review 21 Extant Literature Review Concerning A3mentioning

confidence: 99%

“…The structural shift arrangement around the crack surface was analysed by scanning electron microscopy (SEM). Yang et al [16] studied the influence of cooling rate on solution heat treatment of as-cast A356 alloy. Kumar et al [28] employed Taguchi experimental design and 30 simulations in suggesting the semi-solid state movement of alloy as well as analyze the thrxo forging properties of semi-solid A356 alloy.…”

Section: Literature Review 21 Extant Literature Review Concerning A3mentioning

confidence: 99%

“…A number of current research papers discuss the probable advantages of e-ISSN: 2289-7771 387 reinforcing A356 with organic materials (e.g. [10][11][12][13]), whereas other investigators have exhibited crucial concern about specific property enhancement for the A356 reinforced composites, including corrosion resistance [14], surface enhancement [15], microstructural and associated property enhancement through heat treatment [16][17][18][19][20][21]. The reported studies are nonetheless principal papers regarding metallic reinforced A356 alloy while very scanty papers were noted for organic reinforced A356 alloy, indicating a very restricted number of experimental research available in the literature on A356 alloy organic reinforced composites.…”

Section: Introductionmentioning

confidence: 99%

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Taguchi Optimisation of Cast Geometries for A356/Organic Particulate Aluminium Alloy Composites Using a Two-Phase Casting Process

Nwafor

Oke

Ayanladun

2019

JASPE

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The A356 alloy is widely known to exhibit an extremely superior casting, machining, mechanical, and corrosion resistance properties. Despite these, it constitutes an environmental nuisance at its improper disposal for worn-out engine blocks. Also, organic reinforcements have the potentials to reduce the environmental impacts of composites. Consequently, there exits significant research potential to fuse A356 alloy with organic materials to obtain enhanced composite properties. In the area of aluminium matrix, as melting and solidifications of materials are done the accuracy of measurements is driven by the huge array of process parameters and the geometrical aspect of cast components is important. For these reasons, we attempt to solve the problem of optimising the geometry of casts in a complicated scenario with the use of the robust Taguchi's methods. To optimise the framework, the significant process parameters are identified and their effects studied in a route using Taguchi, Taguchi-Pareto and Taguchi–ABC methods. Parameters such as the volume of the cast, length, weight, density, height, width, breadth, weight loss and the total weight of organic materials infused into the melting process were studied for parametric changes, interactions and optimisation with L27 orthogonal array. The analysis of variance for the A356 alloy cast revealed that the density parameter of cast 1 had the highest and major significant effect on the casting process with a variance of 333573, followed by weight parameter of casts 1 and 2, total weight of organic material parameters and weight loss with the variance values of 0.007, 0.005, 0.001 and 0.004, respectively. The variance of other parameters was insignificant to the A356 alloy cast.

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The Effect of Surface Roughness and Composition on Wetting and Corrosion of Al−Si Alloys

Behera

Suri

Salowitz

et al. 2020

Israel Journal of Chemistry

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This paper presents results of wetting and corrosion of cast Al−Si alloys with composition varying from 7–50 wt% Si in contact with water. The dependency of the wetting angle and corrosion properties on the alloy composition, surface roughness, size of water droplets, and microstructure were studied. An increase in the Silicon content reduced the water contact angle (WCA) while an increase in the roughness and/or droplet size increased the WCA. No systematic variation in corrosion was found due to change in the Silicon content. The results are of interest for the development of lightweight (Al−Si) alloys with non‐wetting and corrosion‐resistant properties.

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Effects of cooling rate on solution heat treatment of as-cast A356 alloy

Cited by 38 publications

References 15 publications

A new fast heat treatment process for cast A356 alloy motorcycle wheel hubs

A new fast heat treatment process for cast A356 alloy motorcycle wheel hubs

Taguchi Optimisation of Cast Geometries for A356/Organic Particulate Aluminium Alloy Composites Using a Two-Phase Casting Process

The Effect of Surface Roughness and Composition on Wetting and Corrosion of Al−Si Alloys

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