The columnar to equiaxed transition during solidification of Sn–Pb alloys

Siqueira, Claudio; Cheung, Noé; Garcia, Amauri

doi:10.1016/s0925-8388(02)01026-5

Cited by 65 publications

(52 citation statements)

References 16 publications

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“…According to this list in table 1, it seems that cooling rate is not sensitive to the position of the CET. On the other hand, the response of The thermal CET criteria are recognized as very good indicative for the macrostructural transition as reported in several articles [12][13][14]17,18 . However, none previous study has been found on determining the solidification thermal parameters associated with the CET of cast iron.…”

Section: Resultsmentioning

confidence: 83%

“…However, none previous study has been found on determining the solidification thermal parameters associated with the CET of cast iron. In the case of Sn-based 12,13,19 and Al-based 14,17,18 alloys investigations have been addressed to single-phase and hypoeutectic alloys. In these cases, critical cooling rate was established as a realistic criterion, since cooling rate (Ṫ) encompasses growth rate (V) and temperature gradient (G), i.e., =G x v. The present investigation deals with a eutectic alloy and in this case it appears that a critical growth rate of about 0.6mm/s is adequate criteria for cast iron.…”

Section: Resultsmentioning

confidence: 99%

“…Svidró and Diószegi 10 stated that there are limited known investigation methods to determine CET in cast iron and consequently there is no information on how metallurgical parameters are affecting its occurrence. Investigations on vertically upward directional solidification of Al-Cu, Al-Si and Sn-Pb alloys have proposed a CET criteria based on critical cooling rates of about 0.2 K/s, 0.17 K/s and 0.014 K/s, respectively, with the columnar growth prevailing throughout the casting for cooling rates higher than these critical values [12][13][14] . The application of such criterion based on a critical solidification thermal parameter has never been verified considering data from solidification of cast iron.…”

Section: Introductionmentioning

confidence: 99%

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Transient Directional Solidification of Cast Iron: Microstructure Formation, Columnar to Equiaxed Transition and Hardness

Spinola

Spinelli

2016

Mat. Res.

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A number of applications may require cast iron. Engine cylinder blocks, flywheels, gearbox cases, machine-tool bases may be manufactured by using grey cast iron while bearing surfaces with white cast iron. Thus, understanding the solidification behaviour of eutectic cast iron becomes an essential task, with certain points to be accomplished. Transient directional solidification may provide particular advantages in order to deal with these items, such as the large variation of growth rate (V) and cooling rate (Ṫ) values, which may allow a variety of microstructures and morphologies to be studied. The aim of this work is to examine the macrostructure regions, scale of the dendritic microstructure, proportions of the formed phases and hardness of samples obtained by transient directional solidification of a eutectic cast iron (Fe-3.5wt%C-2.5wt%Si). It was shown that a CET criterion should be based on a critical V value at the solidification front of about 0.6 mm/s. The effects of the formed phases, their proportions and λ 2 on hardness of the cast alloy are assessed.

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transient Directional Solidification of Cast Iron: Microstructure Formation, Columnar to Equiaxed Transition and Hardness

Spinola

Spinelli

2016

Mat. Res.

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“…Since the heat flow in this experiment was from the heater to the cooler under the suppression of convection, the preferable growing <110> direction of the primary phase must be parallel to this thermal flow direction [11]. This is the reason why the (220)-plane peak was the highest peak in the sample II.…”

Section: Suppression Of Natural Convection By Magnetic Fieldmentioning

confidence: 97%

Crystal alignment of primary phase during solidification

Iwai¹,

Usui²,

Toyoda³

et al. 2009

J. Phys.: Conf. Ser.

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“…Zone 2 ends where the local thermal gradient falls to another critical level (also alloy and cooling rate dependent) that permits the CET to occur [6,25]. Increased cooling ability of the mould in general increases the depth at which the CET occurs, but because it also changes the depth of the DFT, the overall effect on the width of zone 2 is quite variable (Figure 9).…”

Section: / 23mentioning

confidence: 99%

A new multi-zone model for porosity distribution in Al–Si alloy castings

2013

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Link back to DTU Orbit Citation (APA):Tiedje, N. S., Taylor, J. A., & Easton, M. A. (2013). A new multi-zone model for porosity distribution in Al-Si alloy castings. Acta Materialia, 61(8), 3037-3049. DOI: 10.1016/j.actamat.2013 AbstractA new multi-zone model is proposed that explains how porosity forms in various regions of a casting under different conditions and leads to distinct zonal differences in pore shape, size and distribution. This model was developed by considering the effect of cooling rate on solidification and distribution of porosity in Al-Si alloys cast as plates in moulds made with silica, ilmenite or zirconia sand cores or steel chills facing the major plate faces. The alloys cast were Al-7wt% Si and Al-12.5wt% Si in unmodified and modified forms, the latter with either Na or Sr addition. It is found that regardless of cooling condition, Si content and modification treatment the microstructure can be divided into three zones of varying size (across the casting thickness) that are determined by the local cooling conditions and the nucleation and growth mode of the Al-Si eutectic. The zones are: (1) an outer shell-like zone where directional columnar dendritic grains and a fine celled, coherent eutectic form a low porosity shell at the casting surface; (2) a transitional zone where equiaxed, eutectic cells grow between columnar dendritic grains and irregular pores become trapped in the mush; and finally, (3) a central zone where the thermal gradient is low and equiaxed dendritic grains and eutectic cells grow at the centre of the casting and larger rounded pores tend to form. The paper discusses how Si content, modification type and cooling conditions influence the location and size (i.e. depth) of each of these zones and how the distribution of porosity is thus affected.

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The columnar to equiaxed transition during solidification of Sn–Pb alloys

Cited by 65 publications

References 16 publications

Transient Directional Solidification of Cast Iron: Microstructure Formation, Columnar to Equiaxed Transition and Hardness

Transient Directional Solidification of Cast Iron: Microstructure Formation, Columnar to Equiaxed Transition and Hardness

Crystal alignment of primary phase during solidification

A new multi-zone model for porosity distribution in Al–Si alloy castings

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