Solute redistribution during and after solidification of Ni-Al-Ta dendritic monocrystals

Kadalbal, R.; Montoya-Cruz, J. J.; Kattamis, T. Z.

doi:10.1007/bf02654518

Cited by 24 publications

(4 citation statements)

References 14 publications

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“…The purpose of homogenization of ingot was to eliminate the element segregation, thus the segregation ratio ( SR ) can be used to characterize the distribution of alloying elements, which is expressed as follows:

S R = C_{1} / C_{2}

where C 1 is the maximum concentration of alloying elements between dendrites and C 2 is the minimum concentration of alloying elements on the dendrite arm. Obviously, the larger value of SR means the more serious segregation of components.…”

Section: Resultsmentioning

confidence: 99%

Investigation on Alloying Element Distribution in Cr8Mo2SiV Cold‐Work Die Steel Ingot during Homogenization

Ren

et al. 2018

steel research int.

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The effect of different homogenization parameters on the microstructure and element distribution of Cr8Mo2SiV cold-work die steel ingot is investigated. Based on the Thermo-Calc software and laser confocal microscopy, the optimal heat treatment temperature range from 1160 to 1230 C is obtained for experimental steel. In order to improve dendritic segregation of as-cast microstructure consisting of a large number of network eutectic carbides enriched in alloying elements, the homogenization treatment is carried out at the above determined temperatures for 0.5, 1, and 3 h, respectively. Then, according to the segregation ratio of Cr element, the homogenization at 1180 C for 3 h successfully eliminates the microsegregation, which is in agreement with the calculation of the diffusion kinetic model of Cr element.

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S R = C_{1} / C_{2}

Section: Resultsmentioning

confidence: 99%

Investigation on Alloying Element Distribution in Cr8Mo2SiV Cold‐Work Die Steel Ingot during Homogenization

Ren

et al. 2018

steel research int.

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“…The partition coefficients (C s * / C I ) for tantalum, titanium, aluminum, cobalt and tungsten for PWA-1480 are also given in this table. Table 1 also lists the partition coefficients reported in the literature for nickel-base alloys: kAI and kra for the ternary alloy Ni-13.1AI-5.1Ta [8], kef' kw and kri for MAR-M200 [9], and keo for Waspalloy [10], and those for the nickel-base binaries [7]. Table 1 shows that the solute partition coefficients of all these elements in PWA-1480 are reasonably constant in the temperature range investigated.…”

Section: Solute Partition Coefficientsmentioning

confidence: 99%

Solutal partition coefficients in nickel-based superalloy PWA-1480

Tewari

Vijayakumar

Lee

et al. 1991

Materials Science and Engineering: A

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Solutal profiles in dendritic single-crystal specimens of PWA-1480 nickel-base superalloy, which were directionally solidified and quenched, were examined on several transverse cross-sections to obtain the partition coefficients. Similar to their nickel-base binaries, the partition coefficients of tantalum, titanium, and aluminum were found to be less than unity; those of tungsten and cobalt were greater than unity. The partition coefficients were temperature independent in the range 1584-1608 K. The contribution of solid-state diffusion to microsegregation was observed to be negligible.

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“…The alloy elements are well-distributed by atoms migrating from the high to low concentration region during the homogenized treatment. Although there are some researches on the homogenization process for different steels at home and abroad, the study on forged steel with 5% Cr steel is still less [6][7][8][9]. At present, the commonly used homogenized temperature is 1250˚C and the holding time is usually above10h for the Cr steel [5].…”

Section: Introductionmentioning

confidence: 99%

The Microstructure and Elements Distribution of High-Chiromium Hypereatectoid Steel by High-Temperature Homogenization

Yang

Shao

2013

AMR

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The temperature range of high-temperature homogenization was determined by phase diagram calculation and the critical overburning temperature of chromium hypereatectoid steel was measured by DSC. The Comparison of microstructures and element segregation before and after homogenized treatment were investigated for chromium steel ingot by means of optical microscope, scanning electron microscopy and EDS. The results show that the liquation carbides and composition segregation are improved after the chromium steel was treated by high-temperature homogenization. According to the results of EDS analysis and segregation ratio calculation for the samples homogenized at different temperature, the optimum homogenization process for Cr steel is 1210°C for 6h.

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Solute redistribution during and after solidification of Ni-Al-Ta dendritic monocrystals

Cited by 24 publications

References 14 publications

Investigation on Alloying Element Distribution in Cr8Mo2SiV Cold‐Work Die Steel Ingot during Homogenization

Investigation on Alloying Element Distribution in Cr8Mo2SiV Cold‐Work Die Steel Ingot during Homogenization

Solutal partition coefficients in nickel-based superalloy PWA-1480

The Microstructure and Elements Distribution of High-Chiromium Hypereatectoid Steel by High-Temperature Homogenization

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