Pore annihilation in a single-crystal nickel-base superalloy during hot isostatic pressing: Experiment and modelling

Epishin, Alexander; Fedelich, Bernard; Link, Thomas; Feldmann, Titus; Светлов, И. Л.

doi:10.1016/j.msea.2013.08.034

Cited by 57 publications

(60 citation statements)

References 5 publications

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“…The data obtained in this work have been used in an elastoviscoplastic model describing the kinetics of porosity annihilation in CMSX-4 during commercial HIP. [6,7] II. EXPERIMENTAL…”

Section: Introductionmentioning

confidence: 99%

Creep of Single Crystals of Nickel-Based Superalloys at Ultra-High Homologous Temperature

Epishin

Fedelich

Nolze

et al. 2018

Metall Mater Trans A

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The creep behavior of single crystals of the nickel-based superalloy CMSX-4 was investigated at 1288°C, which is the temperature of the hot isostatic pressing treatment applied to this superalloy in the industry. It was found that at this super-solvus temperature, where no c¢-strengthening occurs, the superalloy is very soft and rapidly deforms under stresses between 4 and 16 MPa. The creep resistance was found to be very anisotropic, e.g., the creep rate of [001] crystals was about 11 times higher than that of a [111] crystal. The specimens of different orientations also showed a very different necking behavior. The reduction of the cross-sectional area w of [001] crystals reached nearly 100 pct, while for a [111] crystal w = 62 pct. The EBSD analysis of deformed specimens showed that despite such a large local strain the [001] crystals did not recrystallize, while a less deformed [111] crystal totally recrystallized within the necking zone. The recrystallization degree was found to be correlated with deformation behavior as well as with dwell time at high temperature. From the analysis of the obtained results (creep anisotropy, stress dependence of the creep rate, traces of shear deformation, and TEM observations), it was concluded that the main strain contribution resulted from h01 1i{111} octahedral slip.

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“…The data obtained in this work have been used in an elastoviscoplastic model describing the kinetics of porosity annihilation in CMSX-4 during commercial HIP. [6,7] II. EXPERIMENTAL…”

Section: Introductionmentioning

confidence: 99%

Creep of Single Crystals of Nickel-Based Superalloys at Ultra-High Homologous Temperature

Epishin

Fedelich

Nolze

et al. 2018

Metall Mater Trans A

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“…The most dangerous are large solidification pores. Industrial manufacturing of single-crystal blades is performed by the Bridgeman method with a temperature gradient of [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] • C/mm and a withdrawal rate of 3-25 mm/min depending on the cooling method. Under such solidification conditions the superalloy crystal grows by dendritic growth which has the side effect, that pores form between the developing dendritic arms.…”

Section: Introductionmentioning

confidence: 99%

Hot isostatic pressing of single-crystal nickel-base superalloys: Mechanism of pore closure and effect on Mechanical properties

Epishin

Link

Fedelich

et al. 2014

MATEC Web of Conferences

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Abstract. Pore annihilation was investigated in the single-crystal nickel-base superalloy CMSX-4. HIP tests at 1288• C/103 MPa were interrupted at different times, then the specimens were investigated by TEM, metallography and density measurements. The kinetics of pore annihilation was determined. The pore closure mechanism was identified as plastic deformation on the octahedral slip systems. A model describing the kinetics of pore closure has been developed on the base of crystal plasticity and large strain theory. Mechanical tests with the superalloy CMSX-4 and the Ru-containing superalloy VGM4 showed, that HIP significantly increases the fatigue life at low temperatures but has no effect on creep strength.

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“…Taking temperature as an example, when the HIP temperature is higher than the solution temperature of γ' phase, the nickel base single crystal superalloy can be softened in the case of single phase, and the plasticity can be significantly improved, which is conducive to the closure of pores. However, when the temperature is close to the solidus temperature of the alloy, there is a risk of recrystallization and initial melting inside the material, which is strictly prohibited in engineering applications [12][13] . Therefore, in order to control the cost and ensure the quality of the parts, it is necessary to study the control and influence mechanism of different parameters of HIP treatment on the microstructure and properties of the alloy in detail, and select the optimal matching scheme of process parameters, so as to obtain the alloy material with significantly improved comprehensive performance and give full play to the advantages of HIP technology.…”

Section: Effect Of Hip On Densification Of Nickel Base Single Crystalmentioning

confidence: 99%

“…(a)～ (c)：lower than the dissolution temperature of γ 'phase； (d)～ (e)：higher than the dissolution temperature of γ' phase Alexander Epishin [13] studied the hole healing mechanism of nickel-based single crystal superalloy CMSX-4, and set up a series of interrupt experiments to explore the dynamic mechanism of hole healing. Analyzing the experimental results, the article considers that the hole closure is mainly caused by plastic deformation caused by dislocation slip.…”

Section: Study On Hole Healing Mechanism Under Hot Isostatic Pressurementioning

confidence: 99%

Application research progress of hot isostatic pressing technology in nickel-based single crystal superalloy

Wang

Jiang

2020

E3S Web Conf.

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Since the introduction of hot isostatic pressing (HIP) technology, it has been widely used in powder metallurgy forming and improving the densification of castings. With the increasing demand for the performance of nickel-based single crystal superalloy, more and more scholars started research on the application of hot isostatic pressing in nickel-based single crystal superalloy. This article summarizes the current research progress in the application of hot isostatic pressing to the high temperature of nickel-based single crystals, explains the elimination effect of hot isostatic pressing on porosity and other pore defects in nickel-based single crystal superalloy, analyzes the pore healing mechanism, and the changes in mechanical properties such as tensile, endurance, and fatigue of the alloy after applying hot isostatic pressing are shown. Finally, the future development of China's hot isostatic pressing technology is prospected.

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Pore annihilation in a single-crystal nickel-base superalloy during hot isostatic pressing: Experiment and modelling

Cited by 57 publications

References 5 publications

Creep of Single Crystals of Nickel-Based Superalloys at Ultra-High Homologous Temperature

Creep of Single Crystals of Nickel-Based Superalloys at Ultra-High Homologous Temperature

Hot isostatic pressing of single-crystal nickel-base superalloys: Mechanism of pore closure and effect on Mechanical properties

Application research progress of hot isostatic pressing technology in nickel-based single crystal superalloy

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