A statistically significant experimental technique for investigating microsegregation in cast alloys

Gungor, M. N.

doi:10.1007/bf02666687

Cited by 129 publications

(57 citation statements)

References 11 publications

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“…This provided representative compositional information from the dendrite cores to the interdendritic regions. The solid-liquid partition coefficients, or k values (where k = X S / X L ), for each element were then quantified using a modified Scheil-analysis [10,11]. 819 …”

Section: Methodsmentioning

confidence: 99%

Solidification Characteristics of Advanced Nickel-Base Single Crystal Superalloys

Hobbs

Tin

Rae

et al. 2004

Superalloys 2004 (Tenth International Symposium)

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Twenty-two Ni-base superalloy compositions were investigated to assess the influence of the constituent elements on their solidification characteristics. Increasing the amount of Cr and Mo in high refractory single crystal alloys appears to reduce the extent of microsegregation of the dense refractory elements, W and Re. This is likely to be advantageous for maintaining single crystal solidification since alloys containing elevated levels of W and Re are prone to the formation of macroscopic grain defects during single crystal solidification. These findings suggest that elemental interactions between Cr, Mo, W and Re need to be considered when optimising alloys for high temperature creep properties. Ru additions also appear beneficial not only through stabilisation of the microstructure with respect to topological-close-packed (TCP) phase formation but also by reducing the degree to which Re partitions to the dendrite core. Linear regression has been applied to predict the solid-liquid partition coefficients for the major constituent elements and therefore provide an indication of the susceptibility of a given composition to freckle formation during directional solidification.

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Section: Methodsmentioning

confidence: 99%

Solidification Characteristics of Advanced Nickel-Base Single Crystal Superalloys

Hobbs

Tin

Rae

et al. 2004

Superalloys 2004 (Tenth International Symposium)

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“…For this reason, additional experiments were carried out, investigating the amount of microsegregation using the more traditional method of measuring composition as a function of sample fraction. [4] It was concluded that, although the amount of eutectic at the eutectic temperature measured using the calorimeter was as predicted, the final ordered compositionfraction plot did not fit well, particularly at high Cu concentrations. This type of behavior has been found by other authors.…”

Section: Introductionmentioning

confidence: 90%

Microsegregation in Al-Cu alloys

Kurum

Dong

Hunt

2005

Metall Mater Trans A

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A comparison has been made between the amount of microsegregation predicted by a numerical model and that found experimentally in Al-Cu alloys varying in composition between 1 and 8 wt pct Cu. A depleted region was predicted and observed experimentally near the Al 2 Cu. The depleted region was formed below the eutectic temperature and had a significant effect on the ordered compositionfraction plots, particularly for high alloy compositions. Although the fit between experiment and theory was reasonably good, it was concluded that it was necessary to propose that local equilibrium was not maintained between the phases in the solid-state reactions.

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“…Of the techniques available, random sampling approach, which is commonly known as point matrix scan technique, is widely used for characterizing microsegregation in Ni-base superalloys [3,4,7,[11][12][13][14]. This technique has become prevalent because it allows characterizing microsegregation with no dependence on the plane of examination and simply provides a continuous profile with respect to the fraction of solid ( s ).…”

Section: Introductionmentioning

confidence: 99%

Solute Redistribution during Planar and Dendritic Growth of Directionally Solidified Ni-Base Superalloy CMSX-10

Seo

Lee

Yoo

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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The solute redistribution behavior during directional solidification of the alloy CMSX-10 with planar and dendritic solid/liquid (S/L) interfaces has been investigated by directional solidification and quenching (DSQ) technique. In particular, the elemental partitioning coefficient during the solidification of primary γ and γ/γ′ eutectic was quantitatively estimated by electron probe microanalysis (EPMA) on the sample quenched during planar growth of primary γ and γ/γ′ eutectic, respectively. The EPMA compositional profiles clearly revealed that Scheil solidification occurs during the solidification of primary γ with planar S/L interface. Based on this result, the evolution of γ/γ′ eutectic volume fraction with respect to the solidification rate in dendritic solidification regimes could be rationalized by considering the back-diffusion effect on decreasing the extent of microsegregation. The comparison of the compositional profiles of Cr in the planar grown DSQ sample and the local distribution of Cr in dendritically solidified sample indicated that the solidification of the alloy CMSX-10 completes with the formation of supersaturated γ phase after the γ/γ′ eutectic reaction.

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A statistically significant experimental technique for investigating microsegregation in cast alloys

Cited by 129 publications

References 11 publications

Solidification Characteristics of Advanced Nickel-Base Single Crystal Superalloys

Solidification Characteristics of Advanced Nickel-Base Single Crystal Superalloys

Microsegregation in Al-Cu alloys

Solute Redistribution during Planar and Dendritic Growth of Directionally Solidified Ni-Base Superalloy CMSX-10

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