Preparation of Inconel 740 superalloy by electron beam smelting

You, Xiaogang; You, Qifan; Shi, Shuang; Li, Jiayan; Ye, Fei; Wei, Xin

doi:10.1016/j.jallcom.2016.03.140

Cited by 27 publications

(4 citation statements)

References 18 publications

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“…Ardell [12]. The shear stress caused by modulus hardening is given as: (4) in which R denotes the radius of γ`, and ∆G denotes the shear modulus difference of the matrix and precipitates. The shear modulus of γ` is determined to be 72.87 GPa.…”

Section: Microstructures and Precipitation Behavior Of Ebs 740 Superamentioning

confidence: 99%

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The Precipitation Behavior and Hot Deformation Characteristics of Electron Beam Smelted Inconel 740 Superalloy

You

Tan

et al. 2018

J. of Materi Eng and Perform

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The Inconel 740 superalloy was prepared by the electron beam smelting (EBS) technology, the precipitation behavior and strengthening mechanism were studied, and the hot deformation characteristics of EBS 740 superalloy were investigated. The results indicate that the EBS 740 superalloy is mainly strengthened by the mechanism of weakly coupled dislocation shearing, and the resulting critical shear stress is calculated to be 234.6 MPa. The deformation parameters show a great influence on the flow behavior of EBS 740 superalloy. The strain rate sensitivity exponent increases with the increasing of deformation temperature, and the strain hardening exponent shows a decreasing trend with the increasing of strain. The activation energy of EBS 740 above 800 °C is measured to be 408.43 kJ/mol, which is higher than the 740H superalloy. A hyperbolic-sinetype relationship can be observed between the peak stress and Zener-Hollomon parameter. Nevertheless, the influence of deformation parameters is found to be considerably different at temperatures below and above 800 °C. The size of dynamic recrystallization (DRX) grains decreases with the increasing of strain rate when the strain rate is lower than 1/ s, and reverse law can be found at higher strain rate. As a result, a piecewise function is established between the DRX grain size and hot working parameters.Abstract: The Inconel 740 superalloy was prepared by the electron beam smelting (EBS) technology, the precipitation behavior and strengthening mechanism were studied, and the hot deformation characteristics of EBS 740 superalloy were investigated. The results indicate that the EBS 740 superalloy is mainly strengthened by the mechanism of weakly coupled dislocation (WCD) shearing, and the resulting critical shear stress is calculated to be 234.6 MPa. The deformation parameters show a great influence on the flow behavior of EBS 740 superalloy. The strain rate sensitivity exponent increases with the increasing of deformation temperature, and the strain hardening exponent shows a decreasing trend with the increasing of strain. The activation energy of EBS 740 above 800 °C is measured to be 408.43 kJ/mol, which is higher than the 740H superalloy. A hyperbolic-sine type relationship can be observed between the peak stress and Zener-Hollomon parameter. Nevertheless, the influence of deformation parameters is found to be considerably different at temperatures below and above 800 °C. The size of dynamic recrystallization (DRX) grains decreases with the increasing of strain rate when the strain rate is lower than 1/s, and reverse law can be found at higher strain rate. As a result, a piecewise function is established between the DRX grain size and hot working parameters.

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Section: Microstructures and Precipitation Behavior Of Ebs 740 Superamentioning

confidence: 99%

“…Besides, the formation of carbides such as TiC and Cr 23 C 6 can further strengthen the superalloy by retarding the grain boundary sliding [2,3]. Moreover, the Ti, Al and Cr elements could provide the good corrosion resistance by formation of the three distinct oxidation layers for 740 superalloy [4].…”

Section: Introductionmentioning

confidence: 99%

The Precipitation Behavior and Hot Deformation Characteristics of Electron Beam Smelted Inconel 740 Superalloy

You

Tan

et al. 2018

J. of Materi Eng and Perform

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“…In the furnaces, a combination of a high vacuum environment and material superheating (up to 1.3-1.5 of the melting temperature), results in a highly efficient refining process. The electron beam method (EBM) is an effective method that has been utilized for refining refractory 2 of 9 metals [24][25][26][27] and alloys [28,29], purifying solar-grade silicon [30,31], obtaining superalloys [18,32,33], high-purity special steels, and so on. We note that the electron beam melting method mentioned in this investigation involves a melting furnace that produces ingots by using an electron beam, which differs from the common adoption for the additive manufacturing method.…”

Section: Introductionmentioning

confidence: 99%

Effect of Electron Beam Method on Processing of Titanium Technogenic Material

Vutova

Vassileva

Stefanova

et al. 2019

Metals

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This study reveals the efficiency of the electron beam processing of titanium technogenic material with a high level of impurities and the quality of the obtained metal in correlation to process parameters which are discussed. The influence of the beam power and melting time on the composition variation, morphologies, hardness of metal samples and mass losses is investigated. Based on the different technological parameters, the removal efficiency of impurities is also discussed, and the corresponding experiments are carried out in order to make a comparison. Different thermal process conditions are realized during the single-melt operation. Chemical and metallographic analyses are performed, and the results are discussed. The hardness of the titanium decreases by prolonging the time of the electron beam processing. A maximal overall removal efficiency of 99.975% is seen at 5.5 kW beam power for a 40 min melting time and the best purification of Ti (99.996%) is achieved.

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“…Furthermore, the electron beam can be controlled accurately in order to acquire the ingots with an excellent surface quality and solidification structure [12,13]. Recently, this melting technology has been utilized to purify solar-grade silicon [14,15], as well as to refine refractory metals [16], superalloys [17,18], and titanium alloys [19,20].…”

Section: Introductionmentioning

confidence: 99%

Volatilization Behavior of β-Type Ti-Mo Alloy Manufactured by Electron Beam Melting

Yao

Min

Shi

et al. 2018

Metals

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The effects of electron beam melting parameters on the volatilization behavior of elements and the microstructures of ingots were investigated on a β-type Ti-Mo binary alloy. The microstructures of the ingots consisted of large and columnar grains at their bottom and top sections, respectively, and they were similar at different melting powers, from 10.5 kW to 15.0 kW, and the melting time ranging from 10 min to 40 min, without apparent metallurgical defects. Mass losses of ingots exhibited an increasing tendency, with increases of both melting power and melting time. Combined with a theoretical calculation and X-ray fluorescence results, Ti was identified as the main volatilization element due to its much higher vapor pressure than that of the Mo element. The considerable compensation method of the volatile Ti element was established in terms of theoretical and experimental results, which could provide a guidance for fabricating composition-controllable Ti-Mo binary alloys via electron beam melting technology.

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Preparation of Inconel 740 superalloy by electron beam smelting

Cited by 27 publications

References 18 publications

The Precipitation Behavior and Hot Deformation Characteristics of Electron Beam Smelted Inconel 740 Superalloy

The Precipitation Behavior and Hot Deformation Characteristics of Electron Beam Smelted Inconel 740 Superalloy

Effect of Electron Beam Method on Processing of Titanium Technogenic Material

Volatilization Behavior of β-Type Ti-Mo Alloy Manufactured by Electron Beam Melting

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