Casting-chill interface heat transfer during solidification of an aluminum alloy

Velasco, Eulogio; Valtierra, S.; Mojica, J.F.; Talamantes, J.; Cano, S.; Colás, Rafael

doi:10.1007/s11663-999-0039-0

Cited by 23 publications

(11 citation statements)

References 16 publications

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“…6,22 Therefore, to prevent crack initiation, the alloy must have either high yield strength to accommodate stress elastically, or high ductility to delay crack formation. 23,26,27 The former is required to prevent gas leakage, and the latter is required to prevent cracking in the valve bridge area of a cylinder head. Another factor that must be taken into account is the degradation of strength owing to overaging, which makes plastic deformation easier.…”

Section: Thermomechanical Fatiguementioning

confidence: 99%

“…Another factor that must be taken into account is the degradation of strength owing to overaging, which makes plastic deformation easier. 22,26,28 Moreover, there are some other parameters that improve TMF resistance such as: narrow thermal stress hysteresis loop, 26,29 high thermal conductivity, low thermal expansion coefficient, [30][31][32] microstructural stability, 26,28 small secondary dendrite arm spacing (SDAS), 23,33 low porosity level [34][35][36] and low content of coarse intermetallic phases. 26,37…”

Section: Thermomechanical Fatiguementioning

confidence: 99%

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Application of cast Al–Si alloys in internal combustion engine components

Javidani

Larouche

2014

International Materials Reviews

328

112

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Excellent thermal conductivity and lower density make Al-Si alloys a suitable alternative for cast iron in the fabrication of engine components. The increase in the maximum operation temperature and pressure of engines necessitates improving the thermomechanical fatigue performance of Al-Si alloys. This paper has two major parts focussing on the use of Al-Si based alloys in cylinder heads and engine blocks. In the first part, the structural stress-strain and material property requirements of cylinder heads are discussed. In addition, the physical and mechanical properties of different competing materials used in the manufacture of engine components are reviewed. The physical metallurgy, solidification sequence and thermal conductivity of Al-Si based alloys are reviewed. Also discussed is the effect of microstructural features on thermomechanical fatigue lifetime. This part also includes an overview of the strengthening mechanisms of cast Al-Si alloys, by dispersed phases and heat treatment. Demands to improve fuel economy and reduce emissions necessitate modifications in the materials and design of engine blocks. Wear resistance and low friction coefficient are the major characteristics required for engine block materials. In the second part, the most promising alternative approaches to manufacturing liner-less Al-Si alloy cylinder blocks are elaborated.

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Section: Thermomechanical Fatiguementioning

confidence: 99%

Section: Thermomechanical Fatiguementioning

confidence: 99%

Application of cast Al–Si alloys in internal combustion engine components

Javidani

Larouche

2014

International Materials Reviews

328

112

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“…The reactions that take place during solidification and cooling are detected by the inflections that occur in any of the three curves, because second degree reactions (solidification and precipitation in this case) cannot proceed until the latent heat of transformation has evolved, [16,17] and this affects the cooling rate and modifies the shape of the curves. [4,6,10,11] The reactions that were detected are identified and indicated in the three curves by surrounding them by ellipses. The change of different microstructural parameters as a function of distance from the chilled end is shown in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

“…The time-derivative (dT/dt) was obtained by fitting a second-degree polynomial through an odd number of points from the cooling curves; dT/dt was evaluated at the midpoint of the odd points. [2,10,11] The specimens used for microstructural evaluation were sectioned from different heights and prepared for light optical microscopy observation using standard techniques. Analysis of porosity was conducted on as-polished samples; measurements of the dendrite arm spacing and grain size were carried out on samples etched with a solution of 1 pct NaOH, 4 pct KMnO 4 , and 95 pct H 2 O.…”

Section: Methodsmentioning

confidence: 99%

Effect of Solidification Rate and Heat Treating on the Microstructure and Tensile Behavior of an Aluminum-Copper Alloy

Talamantes-Silva

Rodrı́guez²,

Talamantes-Silva³

et al. 2008

Metall Mater Trans B

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An aluminum-copper alloy of the A206 type was melt and cast in molds that promote a thermal gradient during solidification to study the effects that solidification rate exerts on the microstructure of the material. The stress-strain characteristics of heat-treated samples were related to microstructural parameters. The reactions occurring during solidification and cooling were detected and identified by means of thermal analyses. The microstructure of the material was assessed by measuring the secondary dendrite arm spacing, grain size, and porosity. It was found that these parameters increase as the solidification rate decreases. The material was heat treated to T4 and T7 conditions and tested in tension. The stress-strain curves were analyzed to determine the yield and ultimate strengths, as well as the strain to failure and that at which the ultimate strength was achieved. It was found that these properties are enhanced by microstructural refining in either testing condition. It was also found that porosity increased due to dissolution of copper-rich particles during heat treating. The best combination of strength and ductility were achieved in the T4 condition.

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“…The small dots in Fig. 3 indicate the width along the rolled specimen that resulted from tting third-degree polynomial splines [25] to the width measurements (indicated by the symbol "). The change in width (spreading) was used to compensate the equivalent strain, •°c, following the procedure described elsewhere [24]:…”

Section: Methodsmentioning

confidence: 99%

Visioplastic analysis of experimental rolling of steel

Rodríguez-Rodríguez

Valdés-Covarrubias

Zambrano‐Robledo

et al. 2001

Proceedings of the Institution of Mechanical Engineers, Part L:

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A visioplastic analysis was carried out in hot rolled samples of different types of steel to study the way strain distributed during deformation. The studies were conducted on wedge-shaped specimens that were cut along their mid-plane, inscribed with a grid, spot welded at both ends and hot rolled in a two-high experimental mill. The coordinates of the nodal points in the grid were measured prior to rolling and after the samples cooled down to room temperature after deforming. This was done by photographing and digitizing the specimens, the spread that resulted from rolling was measured and used to correct the equivalent values of strain. The local components of strain were evaluated from both sets of coordinates. It was found that the distribution of strain followed different patterns, the shear and equivalent components were higher towards the surface, whereas the normal components show a distribution related to the reduction imparted.

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Casting-chill interface heat transfer during solidification of an aluminum alloy

Cited by 23 publications

References 16 publications

Application of cast Al–Si alloys in internal combustion engine components

Application of cast Al–Si alloys in internal combustion engine components

Effect of Solidification Rate and Heat Treating on the Microstructure and Tensile Behavior of an Aluminum-Copper Alloy

Visioplastic analysis of experimental rolling of steel

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