Effects of stress and temperature on creep behavior of a new third-generation powder metallurgy superalloy FGH100L

Tian, Tian; Hao, Zhibo; Chen, Ge; Li, Xinggang; Peng, Shiqing; Jia, Chonglin

doi:10.1016/j.msea.2020.139007

Cited by 14 publications

(20 citation statements)

References 18 publications

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“…The characteristics of the selected compositional clusters are shown in Figure S12 (Supporting Information). It could be observed that the Al/Ti ratio was between 0.3 and 1.1, and the sum of the Co, Mo, and W content was between 14 and 28 wt%, which is consistent with the composition characteristics of high-performance powder superalloys such as LSHR, RR1000, and René 104. ε [58][59][60][61][62][63][64] and b) creep life. [58][59][60][61][62][63]65,66] Based on this range and the step size for each element in Table 1, 648 000 alloys were generated in the design space.…”

Section: Unsupervised Machine Learning-assisted Alloy Designmentioning

confidence: 99%

“…It could be observed that the Al/Ti ratio was between 0.3 and 1.1, and the sum of the Co, Mo, and W content was between 14 and 28 wt%, which is consistent with the composition characteristics of high-performance powder superalloys such as LSHR, RR1000, and René 104. ε [58][59][60][61][62][63][64] and b) creep life. [58][59][60][61][62][63]65,66] Based on this range and the step size for each element in Table 1, 648 000 alloys were generated in the design space. A further screening was performed by integrating the submodels that evaluate the density, topologically close-packed phases, solvus temperature of the γ ′ phase, heat treatment window (HTW), and volume fraction of the γ ′ phase at 1073 K, and the reasons for setting the filtering conditions are detailed in the Supporting Information.…”

Section: Unsupervised Machine Learning-assisted Alloy Designmentioning

confidence: 99%

“…Hence, this empirical relationship is adopted to predict the creep life, and the formula is given as [94] 0.0134 Modeling-Unsupervised Machine Learning Algorithm: By using the modified coarsening model and MCR model, 9166 composition points were calculated to determine the coarsening behaviors at 1123 K, and 6939 composition points were calculated to obtain the creep properties at 1023 K and 690 MPa. During the calculation of the creep properties, the grain size of some superalloys such as FGH100L [63] was assumed to be 21 µm, and the diameter of the γ ′ particles was taken as 520 nm.…”

Section: Experiment-experimental Validation Of the Design Strategymentioning

confidence: 99%

See 2 more Smart Citations

High‐Throughput Method–Accelerated Design of Ni‐Based Superalloys

Liu

Wang

Wang³

et al. 2022

Adv Funct Materials

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Ever-increasing demands for superior alloys with improved hightemperature service properties require accurate design of their composition. However, conventional approaches to screen the properties of alloys such as creep resistance and microstructural stability cost a lot of time and resources. This work therefore proposes a novel high throughput-based design strategy for high-temperature alloys to accelerate their composition selections, by taking Ni-based superalloys as an example. A numerical inverse method is used to massively calculate the multielement diffusion coefficients based on an accurate atomic mobility database. These coefficients are subsequently employed to refine the physical models for tuning the creep rates and structural stability of alloys, followed by unsupervised machine learning to categorize their composition and determine the range of the composition with optimal performance. By using a strict screening criterion, two sets of composition with comprehensively optimal properties are selected, which is then validated by experiments. Compared with recent data-driven methods for materials design, this strategy exhibits high accuracy and efficiency attributed to the high-throughput multicomponent diffusion couples, self-developed atomic mobility database, and refined physical models. Since this strategy is independent of the alloy composition, it can efficiently accelerate the development of multicomponent high-performance alloys and tackle challenges in discovering novel materials.

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Section: Unsupervised Machine Learning-assisted Alloy Designmentioning

confidence: 99%

Section: Unsupervised Machine Learning-assisted Alloy Designmentioning

confidence: 99%

Section: Experiment-experimental Validation Of the Design Strategymentioning

confidence: 99%

See 1 more Smart Citation

High‐Throughput Method–Accelerated Design of Ni‐Based Superalloys

Liu

Wang

Wang³

et al. 2022

Adv Funct Materials

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“…The results show that under the same test condition, different processes have obvious effects on the creep and rupture properties of the alloys, which may be related to the different microstructures of the alloys under different processing conditions. Table 3 shows the density and relative density of the FGH100L alloys under these two processes, which are measured by the drainage method [28]. According to Table 3, the relative densities of the HIPed and IFed alloys are 98.44% and 99.16%, respectively.…”

Section: Creep Properties and Creep Characteristicsmentioning

confidence: 99%

“…Dynamic recrystallization occurs during the IF process, which can refine grains and form curved grain boundaries, and the morphology of grains changes from polygon to nearly spherical. Table 3 shows the density and relative density of the FGH100L alloys under these two processes, which are measured by the drainage method [28]. According to Table 3, the relative densities of the HIPed and IFed alloys are 98.44% and 99.16%, respectively.…”

Section: Creep Properties and Creep Characteristicsmentioning

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

Self Cite

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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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Creep Behaviors and Deformation Mechanisms at Intermediate Temperatures in a Novel γ‐γ′ Nickel‐Based Superalloy

Lv,

Wen,

Xie

et al. 2024

Adv Eng Mater

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The creep behaviors of a novel polycrystalline nickel‐based superalloy were investigated at a wide applied stress range of 500‐950 MPa and temperature ranging from 650 °C to 750 °C. And the microstructure and deformation mechanisms are also analyzed. The results indicate that all creep curves of the novel nickel‐based superalloy are mainly consist of the primary and accelerated stages, whereas the steady‐state stage is not obviously observed. The minimum creep rate increases and the corresponding creep life decreases with the applied stress increasing at constant temperature. The relative longer creep life at 650°C could be attributed to the coupling of stacking faults in the interior of γ' and deformation twinning.This article is protected by copyright. All rights reserved.

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Effects of stress and temperature on creep behavior of a new third-generation powder metallurgy superalloy FGH100L

Cited by 14 publications

References 18 publications

High‐Throughput Method–Accelerated Design of Ni‐Based Superalloys

High‐Throughput Method–Accelerated Design of Ni‐Based Superalloys

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

Creep Behaviors and Deformation Mechanisms at Intermediate Temperatures in a Novel γ‐γ′ Nickel‐Based Superalloy

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