Low Melt Height Solidification of Superalloys

Montakhab, M.; Bacak, Mert; Balikci, Ercan

doi:10.1007/s11661-016-3466-y

Cited by 8 publications

(1 citation statement)

References 29 publications

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“…The reduction of the temperature gradient to G = 12 to 15 K/cm (v = 6 mm/min) resulted in a greater increase of PDAS. [36] Montakhab et al [38] reported the increase of PDAS with an increasing solidification rate of CMSX-4 casting, manufactured using standard and equipped with a submerged baffle Bridgman method and applying a constant temperature gradient of 24 K/ cm as well as solidification rate of 5 mm/min. For the withdrawal velocity of 5 mm/min, the highest temperature gradient achieved in the analyzed blades and in Reference 38 was equal to G = 24 K/cm.…”

Section: E Effect Of Solidification Parameters On the Microstructurementioning

confidence: 99%

Effect of Processing Parameters and Shape of Blade on the Solidification of Single-Crystal CMSX-4 Ni-Based Superalloy

Szeliga

2018

Metall Mater Trans B

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The effect of mold withdrawal velocity, heater and pouring temperatures and the thickness of blade root on the solidification parameters and shape of the liquidus isotherm as well as microstructure of single-crystal CMSX-4 nickel-based superalloy, manufactured by the Bridgman method, has been analyzed in the article. The temperature gradient G, solidification rate v and location of the liquidus isotherm were determined in relation to the radiation baffle on the basis of temperature measurements conducted in nine test points along the height of castings (140 mm) with different thicknesses of root (27, 15 and 7 mm) and withdrawal velocities of 3 and 5 mm/min. The increase of root thickness, relative to the airfoil, resulted in the rise of inhomogeneity of solidification parameters as well as the primary dendrite arm spacing and unsteady state solidification along the whole blade height. However, in the case of blade with constant thickness, the steady-state solidification was created at the distance of 65 to 130 mm from its base. The increase of mold withdrawal velocity caused the decrease of temperature gradient. However, the solidification rate was different from the mold withdrawal velocity, especially in the root and middle part of the airfoil. The increase of heater temperature resulted in a rise of temperature gradient and reduction of the curvature of the liquidus isotherm, whereas the pouring temperature did not affect the solidification parameters in the blade. Particularly unfavorable conditions of the solidification process could occur in the middle part of the airfoil and root because of the lowest value of G/v and the largest primary dendrite arm spacing.

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Section: E Effect Of Solidification Parameters On the Microstructurementioning

confidence: 99%

Effect of Processing Parameters and Shape of Blade on the Solidification of Single-Crystal CMSX-4 Ni-Based Superalloy

Szeliga

2018

Metall Mater Trans B

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The Control of Solidification of Ni‐Based Superalloy Single‐Crystal Blade by Mold Design Modification using Inner Radiation Baffle

2018

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This work is focused on an investigation of the directional solidification process of CMSX‐4 single‐crystal blades in the mold modified by application of inner radiation baffle (IRB). Micro‐ and macrostructure examination is carried out along the height of single‐crystal blades which are manufactured using standard and modified mold, at the withdrawal rates of 3 and 5 mm min−1. It is established that application of modified mold allows better control over liquidus isotherm and leads to increase in temperature gradient, as compared to the manufacturing of blades using standard mold. The average value of temperature gradient in airfoil increases from 14 up to approx. 30 K cm−1 and from 16 up to approx. 40 K cm−1, for withdrawal rate of 5 and 3 mm min−1, respectively. The curvature of liquidus isotherm diminishes and attains near‐flat profile along the airfoil for both values of withdrawal rate. The application of proposed technique results in reduction of primary dendrites arm spacing (PDAS) particularly in the inner and middle part of the blade. PDAS reaches average value of approx. 360 μm for withdrawal rate of 5 mm min−1 and is lower as compared to the standard mold casting withdrawn at the rate of 3 (433 μm) and 5 mm min−1 (468 μm).

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A Method of Stray Grain Suppression for Single-Crystal Superalloy During Seed Melt-Back

Wang

Lan

Liu

et al. 2016

Metall Mater Trans A

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Low Melt Height Solidification of Superalloys

Cited by 8 publications

References 29 publications

Effect of Processing Parameters and Shape of Blade on the Solidification of Single-Crystal CMSX-4 Ni-Based Superalloy

Effect of Processing Parameters and Shape of Blade on the Solidification of Single-Crystal CMSX-4 Ni-Based Superalloy

The Control of Solidification of Ni‐Based Superalloy Single‐Crystal Blade by Mold Design Modification using Inner Radiation Baffle

A Method of Stray Grain Suppression for Single-Crystal Superalloy During Seed Melt-Back

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