Tensile deformation behavior of superalloy 718 at elevated temperatures

Wang, Y.; Shao, Wen‐Zhu; Zhen, Liang; Yang, Chunli; Zhang, X.M.

doi:10.1016/j.jallcom.2008.03.082

Cited by 49 publications

(10 citation statements)

References 16 publications

(19 reference statements)

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“…The value of Q is lower compared to the reported values of other nickel base superalloys, for example superalloy 718 (Q = 443.2 kJ/mol)[14], Haynes230 (Q = 449 kJ/mol)[15], NIMONIC 115 (Q = 404 kJ/mol)[16]. This value is well above that for the self-diffusion of nickel (278.2 kJ/mol[17]), which is believed to attribute to the occurrence of DRX[18,19].Substituting the values of a, n, A and Q into Eq. (4), the peak stress constitutive equation of hot deformation for Inconel 690 can be expressed as:…”

mentioning

confidence: 62%

Hot deformation and processing maps of Inconel 690 superalloy

Guo

Pen

et al. 2011

Journal of Nuclear Materials

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mentioning

confidence: 62%

Hot deformation and processing maps of Inconel 690 superalloy

Guo

Pen

et al. 2011

Journal of Nuclear Materials

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“…Inconel 718 is a typical Ni-based superalloy having high strength [1], excellent resistance to oxidation [2], high corrosion resistance [3,4], adequate ductility and toughness [5], favorable weldability [6] and good machining performance [7]. IN718 is used for critical parts in modern aero-engines, extrusion dies and gas-turbines [8][9][10][11][12][13][14][15][16][17]. Hot deformation is necessary to achieve the required properties in IN718.…”

Section: Introductionmentioning

confidence: 99%

Dynamic recrystallization mechanisms and twining evolution during hot deformation of Inconel 718

Azarbarmas

Aghaie-Khafri

Cabrera

et al. 2016

Materials Science and Engineering: A

198

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The hot deformation behavior of an IN718 superalloy was studied by isothermal compression tests under the deformation temperature range of 950–1100 °C and strain rate range of 0.001–1 s-1 up to true strains of 0.05, 0.2, 0.4 and 0.7. Electron backscattered diffraction (EBSD) technique was employed to investigate systematically the effects of strain, strain rate and deformation temperature on the subgrain structures, local and cumulative misorientations and twinning phenomena. The results showed that the occurrence of dynamic recrystallization (DRX) is promoted by increasing strain and deformation temperature and decreasing strain rate. The microstructural changes showed that discontinuous dynamic recrystallization (DDRX), characterized by grain boundary bulging, is the dominant nucleation mechanism in the early stages of deformation in which DRX nucleation occurs by twining behind the bulged areas. Twin boundaries of nuclei lost their ¿3 character with further deformation. However, many simple and multiple twins can be also regenerated during the growth of grains. The results showed that continuous dynamic recrystallization (CDRX) is promoted at higher strains and large strain rates, and lower temperatures, indicating that under certain conditions both DDRX and CDRX can occur simultaneously during the hot deformation of IN718.Peer ReviewedPostprint (author's final draft

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“…IN718 is an important material used for modern aero-engines, gas-turbines, extrusion dies, etc. [7][8][9][10][11][12][13][14][15] Control of the thermomechanical processing is crucial for obtaining favorable microstructure and properties. The hot deformation behavior of IN718 has been widely studied over the past decade using hot compression tests [6,[16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and constitutive equations of Inconel 718 alloy under quasi-static and quasi-dynamic conditions

et al. 2016

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The deformation behavior of IN718 superalloy was investigated using the hot compression tests in the temperature range of 950-1100 °C, and strain rates covering the quasi-static to the quasi-dynamic regions (0.001-10 s-1). The shape of flow curves as well as the corresponding work hardening rates analysis was utilized to reveal the dynamic recrystallization (DRX) phenomena. DRX was the dominant restoration mechanism in the whole temperature and strain rate domains, which was characterized by the optical and EBSD images. Extended flow softening was observed at high strain rates due to the adiabatic heating and dislocations interaction. In addition to the assessment the capability of Sellars equations, a new constitutive equation based on the multiple variable regression analysis was proposed for modeling the peak stress as a function of strain rate and temperature. Besides the simple form of the proposed model, it has a good accuracy for predicting the peak stress.The deformation behavior of IN718 superalloy was investigated using the hot compression tests in the temperature range of 950-1100 °C, and strain rates covering the quasi-static to the quasi-dynamic regions (0.001-10 s-1). The shape of flow curves as well as the corresponding work hardening rates analysis was utilized to reveal the dynamic recrystallization (DRX) phenomena. DRX was the dominant restoration mechanism in the whole temperature and strain rate domains, which was characterized by the optical and EBSD images. Extended flow softening was observed at high strain rates due to the adiabatic heating and dislocations interaction. In addition to the assessment the capability of Sellars equations, a new constitutive equation based on the multiple variable regression analysis was proposed for modeling the peak stress as a function of strain rate and temperature. Besides the simple form of the proposed model, it has a good accuracy for predicting the peak stress.Peer ReviewedPostprint (published version

show abstract

Tensile deformation behavior of superalloy 718 at elevated temperatures

Cited by 49 publications

References 16 publications

Hot deformation and processing maps of Inconel 690 superalloy

Hot deformation and processing maps of Inconel 690 superalloy

Dynamic recrystallization mechanisms and twining evolution during hot deformation of Inconel 718

Microstructural evolution and constitutive equations of Inconel 718 alloy under quasi-static and quasi-dynamic conditions

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