Stress dependence of the creep behaviors and mechanisms of a third-generation Ni-based single crystal superalloy

Yue, Quanzhao; Liu, Lin; Yang, Wenchao; He, Chuang; Sun, Dejian; Huang, Taiwen; Zhang, Jun; Fu, Hengzhi

doi:10.1016/j.jmst.2018.11.015

Cited by 54 publications

(13 citation statements)

References 38 publications

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“…where υ is Poisson's ratio, R is a length scale in the calculation model [73], H (α)(β) is the interaction matrix between two slip systems of α and β with six types of interaction in the matrix [74]. δ 13), (6,18), (8,17), (9,15), (10,16), (11,14), (1,16), (2,17), (3,18), (5,14), (7,13), (12,15) 0 otherwise…”

Section: Physics-based Constitutive Modelsmentioning

confidence: 99%

“…The excellent mechanical properties of the superalloys are attributed to the two-phase microstructure, i.e., γ' precipitate phase and γ matrix phase, with L1 2 ordered γ' phase being coherently embedded in γ phase of face-centered cubic structure (Figure 1a). The ordered γ' phase with high volume fraction (about 60-70% in most cases) serves as the strengthening phase in the superalloys and hinders the motion of dislocations during creep deformation [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…This behavior results in the increase of the plastic strain in the corresponding γ channels Under mechanical loading at high temperature, the morphology of the γ' precipitate evolves from cubic shape to plate-like shape, as shown in Figure 1, which is referred to as directional coarsening or rafting. The rafting is a complex process, which can contribute to the hardening of the materials, since the raft structure inhibits dislocation climb around the γ' phase and restricts the motion of dislocations in γ channels [2][3][4]. However, there are reports that the rafting behavior can also lead to the softening of materials [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Review of γ’ Rafting Behavior in Nickel-Based Superalloys: Crystal Plasticity and Phase-Field Simulation

Wang

Yang

et al. 2020

Crystals

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Rafting is an important phenomenon of the microstructure evolution in nickel-based single crystal superalloys at elevated temperature. Understanding the rafting mechanism and its effect on the microstructure evolution is of great importance in determining the structural stability and applications of the single crystal superalloys. Phase-field method, which is an excellent tool to analyze the microstructure evolution at mesoscale, has been gradually used to investigate the rafting behavior. In this work, we review the crystal plasticity theory and phase-field method and discuss the application of the crystal plasticity theory and phase-field method in the analysis of the creep deformation and microstructure evolution of the single crystal superalloys.

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Section: Physics-based Constitutive Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Review of γ’ Rafting Behavior in Nickel-Based Superalloys: Crystal Plasticity and Phase-Field Simulation

Wang

Yang

et al. 2020

Crystals

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“…Wu et al [17] studied the microstructural evolution and creep behavior of an Ni 3 Al-based as-cast superalloy under a high-temperature heat treatment. Yue et al [18] studied the high-temperature creep behavior of the third-generation nickel-based single crystal superalloy under the condition of 1100 • C/120-174 MPa. Huo et al [19] studied the microstructure of the alloys with different contents of Co (7.0 wt % and 15.0 wt %), Cr (3.5 wt % and 6.0 wt %), Mo (1.0 wt % and 2.5 wt %), and Ru (2.5 wt % and 4.0 wt %) under the creep condition of 950 • C/400 MPa.…”

Section: Introductionmentioning

confidence: 99%

Influences of a Hot-Working Process on the Microstructural Evolution and Creep Performance of a Spray-Formed Nickel-Based Superalloy

Tian

Chen

et al. 2020

Metals

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A new third generation nickel-based powder metallurgy (PM) superalloy, designated as FGH100L, was prepared by spray forming. The effects of hot isostatic pressing (HIP) and isothermal forging (IF) processes on the creep performance, microstructure, fracture, and creep deformation mechanism of the alloy were studied. The microstructure and fracture were characterized by optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The coupled HIP and IF process improved the creep performance of the alloy under the creep condition of 705 °C/897 MPa. As for both the HIPed and IFed alloys, the creep process was dominated by the accumulation of dislocations and stacking faults, cutting through γ’ precipitates. The microstructural evolution was the main factor affecting the creep performance, which mainly manifested as coarsening, splitting, and morphology change of γ’ precipitates. Both the creep fractures of the HIPed and IFed alloys indicated intergranular fracture characteristics. In the former, wedge-shaped cracks usually initiated at the trigeminal intersection of the grain boundaries, while in the latter, cavity cracks generate more easily around the serrated curved grain boundary and carbides.

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“…Two types of superdislocations, a<110> and a[100] are prevailingly formed in [001] and [011] specimens, while lots of a<110> and a few a[001] superdislocations are observed in [111] specimens. The well known a<110> superdislocations can simply glide on {111} planes[17,39], but the a[100] superdislocations can only move by pure climb or the coupled glide and climb of two a/2<110> superpartials in [001] and [011] specimens due to the lack of resolved stress for slip[17,24,36]. Besides, the magnitude of a[100] superdislocations (|b| = a) is smaller than that of a<110> super-…”

mentioning

confidence: 99%

Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 °C/150 MPa

Wang

Gong

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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The influence of orientation on the stress rupture behaviors of a 3rd-generation nickel-based single-crystal superalloy was investigated at 1100 °C/150 MPa. It is found that the stress rupture anisotropy is shown at 1100 °C, but not so obvious compared with that at intermediate temperatures. The [001] specimens display the longest rupture life, [111] specimens show the shortest rupture life, and [011] specimens exhibit the intermediate life. Detailed observations show that the final fracture is caused by crack initiation and propagation, and the anisotropy of three oriented specimens is related to the fracture modes, γ/γʹ microstructures, interfacial dislocation networks and cutting mechanisms in γʹ phase. For [001] specimens, N-type rafted structures are formed which can well hinder the slip and climb of dislocations. Besides, the regular interfacial dislocation networks can prevent dislocations from cutting into γʹ phase, leading to the improvement of the creep resistance. For [011] specimens, ± 45° rafted structures and irregular networks result in less strain hardening. For [111] specimens, a large number of crack propagation paths and inhomogeneous deformations caused by irregular rafted structures deteriorate the property and result in the shortest life. Furthermore, a[100] superdislocations with low mobility are widely formed in [001] and [011] specimens which suggests the low creep strain rate during steady creep stage, whereas superdislocations in [111] specimens possess high mobility, which indicates the high strain rate and corresponding poor stress rupture property.

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Stress dependence of the creep behaviors and mechanisms of a third-generation Ni-based single crystal superalloy

Cited by 54 publications

References 38 publications

Review of γ’ Rafting Behavior in Nickel-Based Superalloys: Crystal Plasticity and Phase-Field Simulation

Review of γ’ Rafting Behavior in Nickel-Based Superalloys: Crystal Plasticity and Phase-Field Simulation

Influences of a Hot-Working Process on the Microstructural Evolution and Creep Performance of a Spray-Formed Nickel-Based Superalloy

Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 °C/150 MPa

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