Effect of pouring temperature on microstructure and microsegregation of as-cast aluminum alloy

Ferreira, Alexandre Furtado; Chrisóstimo, Wemberson Bitencourt; Sales, Roberto Carlos; Garção, Wysllan Jefferson Lima; Sousa, Nathália de Paula

doi:10.1007/s00170-019-03979-6

Cited by 15 publications

(7 citation statements)

References 17 publications

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“…Over the years, regarding either vertical unidirectional solidification [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][27][28][29][30] or equal-channel angular pressing 19−26, 31, 32 experiments, sundry works have focused on the resulting microstructure. Since microstructure control is a key factor in generating excellent properties in metals and their alloys, determination of parameters which can affect said microstructures is of primary importance.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Microhardness of Directionally Solidified Al-Si Alloys Subjected to an Equal-Channel Angular Pressing Process

et al. 2022

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The directional solidification technique allows the study of growth of the solid phase, as-cast structure and, finally, its mechanical characteristics as a consequence of thermal parameters. On the other hand, in the last decade, a process called equal-channel angular pressing (ECAP) has emerged as a widely-known technique in fabrication of ultrafine-grained metals and alloys. Applicability of the ECAP technique affords an excellent potential for changing, in a controlled and beneficial manner, the resulting properties of metals and alloys. For this paper, an experimental research has been conducted to study the effects of solidification parameter (cooling rate) on resulting microhardness in hypoeutectic Al-Si alloys, upon use of an ECAP procedure. The influence of cooling on the scale of the dendritic patterns is presented and discussed with recourse to equations. The resulting microhardness variation with position throughout the as-cast materials and cooling rate were characterized by experimental power laws. Results determined after the solidification experiments have revealed microhardness as a function of both cooling rate and position (P) of the as-cast materials to be dependent on alloy composition. In the ECAP process via route C with three passes, "as-solidified" microstructures have been found to be distorted and fragmented during the severe plastic deformation. This deformation imposed on the billets during the ECAP process facilitated obtaining a fine microstructure and high levels of microhardness were observed. However, even with the ECAP process, it was shown that microhardness is strongly dependent of the cooling rates.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Microhardness of Directionally Solidified Al-Si Alloys Subjected to an Equal-Channel Angular Pressing Process

et al. 2022

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“…On the other hand, the experimental data are not conclusive as to the solidification velocity effect on the concentration profiles. In previous studies presented by Paradela et al 27 and Ferreira et al 33 , the concentration profiles move upward with the increase in solidification velocity. However, binary alloy systems were considered in those works presented by authors.…”

Section: Resultsmentioning

confidence: 65%

Analysis of Microsegregation in Al-Si-Cu Ternary Alloys: Interdependence of Solute Composition at the Solubility Limit during Non-Equilibrium Solidification

et al. 2020

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Virtually all metals used industrially undergo a solidification process during their production. Depending on the material and its manufacturing process, its physical/mechanical properties are affected to a greater or lesser extent by the microstructure and microsegregation obtained during the phase change. Aluminum casting alloys are good examples of products where this microstructure is vital for obtaining the desired properties. A sequence of experiments to analyze the upward vertical unidirectional solidification with transient heat transfer conditions in Al-Si-Cu ternary alloys was developed in the present work. The experimental results obtained were compared with classical microsegregation models. Discrepancies related to their use for ternary alloys were raised. Since the calculated results by these models do not take into account the influence of one alloying element on the solubility of the other element, disparities were founded between experimental and numerical results. A microsegregation model was proposed based on the solubility limits of the Si in the alloy as a function of the Cu concentration present in the liquid. The model, combined with the concepts of classical microsegregation theory, allows a realistic description of the microsegregation phenomenon. The model showed an excellent agreement between microsegregation profiles of solute experimentally measured and calculated.

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“…This increasing dendritic spacings with the position in the steel slabs should be associated to the decrease in cooling rate for regions away from the bottom surface. According to Ferreira et al 28 and Sales et al 29 , the cooling rate is an aspect acting in parallel with pouring temperature during solidification experiments, which conditions the changes of the size and morphology in macrostructure of as-cast material. The cooling rate as function of secondary dendritic arm spacing and carbon concentration is depicted in Figure 15.…”

Section: Resultsmentioning

confidence: 99%

An Experimental Investigation of Continuous Casting Process: Effect of Pouring Temperatures on the Macrosegregation and Macrostructure in Steel Slab

et al. 2020

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The solidification control is of extreme importance, because it strongly affects the final casting quality sanity. The structure obtained is generally not homogeneous and gives rise to great variations in composition, with position at small and large scales, which is known as segregation. An understanding of the way segregation occurs in continuous casting is of great importance for steels and in designing post-casting processes. As-cast structures are responsible the reduction in both scale and extension of segregation, because mass transport is dependent on the time required to diffuse a solute over a characteristic distance, e.g., the dendrite spacing that the characterizes the solidification structure. In this work, the effect of pouring temperature in steel slabs on the continuous casting processes are systematically investigated. Relationships between pouring temperature (P T) and center macrosegregation was qualitatively examined. Photomicrographs of specimen taken from transverse sections of steel slabs, shows that macrosegregation is strongly affected by pouring temperature (P T). For solute of carbon, phosphorus and sulfur, has been shown that the pouring temperature (P T) has a significant role on the resulting macrosegregation profiles, while that the elements as such silicon, manganese and aluminum, the said thermal parameter seems not able to affect its macrosegregation profiles. This is due to the fact that the solutes with lower partition coefficients favors segregation during the continuous casting process. It is shown for considered steels, the pouring temperature (P T) influences the position of the columnar to equiaxed transition (CET). Experimental results show that the end of the columnar region is abbreviated when lower pouring temperatures is used in continuous casting process. One can observe that as the pouring temperature (P T) increase in continuous casting process, the secondary dendritic arm spacing (λ 2) increase, i.e., the dendritic morphology became coarsen.

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Effect of pouring temperature on microstructure and microsegregation of as-cast aluminum alloy

Cited by 15 publications

References 17 publications

Microstructure and Microhardness of Directionally Solidified Al-Si Alloys Subjected to an Equal-Channel Angular Pressing Process

Microstructure and Microhardness of Directionally Solidified Al-Si Alloys Subjected to an Equal-Channel Angular Pressing Process

Analysis of Microsegregation in Al-Si-Cu Ternary Alloys: Interdependence of Solute Composition at the Solubility Limit during Non-Equilibrium Solidification

An Experimental Investigation of Continuous Casting Process: Effect of Pouring Temperatures on the Macrosegregation and Macrostructure in Steel Slab

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