Strain rate dependent microstructural evolution during hot deformation of a hot isostatically processed nickel base superalloy

Kumar, Shiva; Raghu, T.; Bhattacharjee, P.P.; Rao, G. Appa; Borah, Utpal

doi:10.1016/j.jallcom.2016.04.185

Cited by 149 publications

(27 citation statements)

References 44 publications

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“…In recent years, numerous researches have been executed to study the high-temperature deformation behaviors [11,12], hot tensile fracture characteristics [13,14], microstructural evolution [15,16,17], and hot workability [18,19] of some typical superalloys. Lin et al [20,21,22] developed accurate phenomenological and physical-base constitutive models to predict high-temperature deformation behavior for GH4169 superalloy.…”

Section: Introductionmentioning

confidence: 99%

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

Wen

Lin

Zhou

2017

Vacuum

117

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Section: Introductionmentioning

confidence: 99%

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

Wen

Lin

Zhou

2017

Vacuum

117

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“…Generally, the nickel‐based superalloys with a Nb/(Ti + Al) ratio above the critical limit are precipitation hardening alloys. Their excellent performances are attributed to the

γ^{'}

(

N {normali}_{3} normaltrue(A l, T i normaltrue)

) and

γ^{″}

(

N {normali}_{3} N b

) strengthening phases, which are the precipitates with coherent relation to matrix . Furthermore,

γ^{″}

and

γ^{'}

phases are the main and auxiliary strengthening phases, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

et al. 2017

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Uniaxial creep tensile experiments are performed to study the influences of initial δ phase (Ni 3 Nb) on the creep features and fracture behaviors of a nickel-based superalloy. Experimental results show that the creep features and fracture behaviors of the researched superalloy are closely relevant to the volume fraction of initial δ phase. The minimum creep rate increases with the increased volume fraction of initial δ phase. The appropriate volume fraction of initial δ phase can improve the creep resistance and plasticity. So, the rupture time and the elongation to fracture initially increase, when the volume fraction of initial δ phase is relatively low, and then decrease with the increase of volume fraction of initial δ phase. Additionally, with the increased initial δ phase, the failure mode changes from a typical intergranular fracture to the mixed fracture pattern of ductile intergranular and cleavage fracture.

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“…The relatively longer deformation time available at lower strain rates such as 0.001 s À 1 , 0.01 s À 1 enhances the kinetics of softening mechanisms like dynamic recrystallization, which weakens the effect of work hardening and eventually leads to lower flow stress. While at higher strain rates like 1.0 s À 1 , on one hand, decreased deformation time constrains the probability of dynamic recrystallization resulting in the increase of work hardening [18]. On the other hand, the remarkable increase of adiabatic temperature lead to the continuously softening process [30].…”

Section: Hot Compression Deformation Behaviorsmentioning

confidence: 99%

“…Besides those, there exists drastic fluctuation between 0.05 strain and 0.15 strain at 1.0 s À 1 , Figure 4d. The abrupt drop is mainly attributed to adiabatic heating effects due to the shorter deformation time available for effective dissipation of heat generated during deformation [18]. The subsequent rise could be put down to the alternation between the work hardening effect and the dynamic softening effect which caused by the rapidly growing grains at high temperature and high strain rate [31].…”

Section: Hot Compression Deformation Behaviorsmentioning

confidence: 99%

“…The service environment of Ni 3 Al alloy is so terrible that we are very strict in its high temperature performance, especially the mechanical properties. It has been described that the hot deformation behaviors of Ni 3 Al-based superalloy are very complicated [17][18][19]. During the process of hot deformation, not only the hot deformation parameters such as strain, strain rate and hot deformation temperature, but also the initial microstructure affect the hot deformation behaviors and final properties [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Deformation behavior and constitutive model for high temperature compression of a newly type of Ni₃Al‐based superalloy

Zhong

Liu

et al. 2019

Materialwissenschaft Werkst

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In order to investigate the hot deformation mechanism of a newly development Ni3Al‐based superalloy, hot compression tests at temperatures between 1100 °C–1250 °C and the strain rates of 0.001 s−1–1.0 s−1 were conducted. The results show that the curves of true stress‐strain indicate the thermal deformation is a typical dynamic recrystallization process, which the peak stresses and steady‐state stresses increase with decreasing temperatures and increasing strain rates. The softening mechanism is mainly dynamic recrystallization. The experimental data of peak stresses and steady‐state stresses is employed to calculate the constants in the Arrhenius equation. The steady‐state stresses are considered more reasonable for solving the parameters in the Arrhenius equation. Based on the constitutive equation obtained, the calculated values of steady‐state stresses match well with the experimental values at the strain rates of 0.001 s−1, 0.01 s−1 and 0.1 s−1, whereas there exists much deviation at 1.0 s−1. For the sake of accuracy of predicted results at 1.0 s−1 strain rate, a modified Zener‐Hollomon parameter Z’ is introduced. The results show that the modified constitutive equations established in this study could well predict the value of steady‐state stress in hot deformation of the newly development Ni3Al‐based alloy.

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Strain rate dependent microstructural evolution during hot deformation of a hot isostatically processed nickel base superalloy

Cited by 149 publications

References 44 publications

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

Deformation behavior and constitutive model for high temperature compression of a newly type of Ni₃Al‐based superalloy

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Strain rate dependent microstructural evolution during hot deformation of a hot isostatically processed nickel base superalloy

Cited by 149 publications

References 44 publications

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

A new dynamic recrystallization kinetics model for a Nb containing Ni-Fe-Cr-base superalloy considering influences of initial δ phase

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

Deformation behavior and constitutive model for high temperature compression of a newly type of Ni3Al‐based superalloy

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Deformation behavior and constitutive model for high temperature compression of a newly type of Ni₃Al‐based superalloy