Effect of ruthenium on microstructure and high-temperature creep properties of fourth generation Ni-based single-crystal superalloys

Song, Wei; Wang, X.G.; Li, J.G.; Ye, L.H.; Hou, Guichen; Yang, Yanhong; Liu, J.L.; Liu, J.D.; Pei, Wenli; Zhou, Yu; Sun, Xiaofeng

doi:10.1016/j.msea.2019.138646

Cited by 39 publications

(11 citation statements)

References 36 publications

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“…Besides, the average size of the γ′ precipitate of the two alloys is 0.385 μm and 0.345 μm, respectively (as shown in Fig. 2b, d [20]), which also decreases remarkably with the increase in Ru. The volume fraction of the γ′ phase of the two alloys is another important parameter, which is 66.1% and 63.4%, respectively.…”

Section: Initial Microstructurementioning

confidence: 82%

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Role of Ru on the Microstructural Evolution During Long-Term Aging of Ni-Based Single Crystal Superalloys

Song

Wang

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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Two experimental alloys containing different contents of Ru were investigated to study the effect of Ru on the microstructural evolution during long-term thermal exposure. The increase in Ru promoted the formation of cubical, tiny, and even γ′ phase after full heat treatment. Moreover, the samples after full heat treatment were exposed at 1100 °C for different time.Based on the classical model by Lifshitz, Slyozov, and Wagner, the coarsening of γ′ phase of the alloy containing 2.5 and 3.5 wt.% Ru during the long-term aging was controlled by the interface reaction and diffusion, respectively. The γ/γ′ lattice misfit was more negative with the increment of Ru addition, which induced the formation of stable rafted γ′ phase in the alloy containing 3.5 wt.% Ru at the initiation of long-term aging. Besides, the increase in Ru reduced the diffusion coefficient, which could restrain the γ′ phase coarsening. The lower γ/γ′ lattice misfit of the alloy containing 2.5 wt.% Ru promoted the interface reaction, which induced the rapid coarsening of γ′ phase. Therefore, the increase in Ru improved the microstructural stability of the alloys. On the other hand, the raise of Ru induced "reverse partitioning" behavior, which was effective in suppressing the emergence of the topologically close-packed phase (TCP phase). The TCP phase occasionally occurred in the alloy containing 2.5 wt.% Ru, which was attributed to the high temperature and the supersaturation of the γ matrix. Moreover, the TCP phase was determined as μ phase, which had a high concentration of Co, Re, Mo, and W. A sketch map describing the evolution of the TCP phase was also constructed.

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Section: Initial Microstructurementioning

confidence: 82%

“…Based on the SEM images after full heat treatment of the two alloys (as shown in Fig. 2a, c [20]), the typical γ/γ′ two-phase microstructure is observed. The γ′ phase is increasingly cuboidal and uniform with the increase in Ru.…”

Section: Initial Microstructurementioning

confidence: 99%

Role of Ru on the Microstructural Evolution During Long-Term Aging of Ni-Based Single Crystal Superalloys

Song

Wang

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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“…Polycrystalline: any study that deals with a superalloy having a polycrystal grain structure [3,5,7,12,33,46,47,53,55,57,67] Comparative studies: any study that has done a comparison on different properties, manufacturing methods, casting conditions, alloys, or any other parameters [1-3, 10, 11, 13, 16, 19-23, 25, 30, 33-36, 39, 45, 47, 52, 53, 57, 66, 74-78] 1 st generation superalloy: any study that has used a 1 st generation superalloy [1, 3, 5-7, 10, 11, 13, 30-35, 40, 42, 43, 49, 79] 2 nd generation superalloy: any study that has used a 2 nd generation superalloy [16, 19, 20, 22, 23, 28, 29, 33, 36-38, 43, 56, 68] 3 rd generation superalloy: any study that has used a 3 rd generation superalloy [8,21,50] 4 th generation superalloy: any study that has used a 4 th generation superalloy [23,51,77] 4…”

Section: Research Areamentioning

confidence: 99%

“…Advances in Materials Science and Engineering [13,25,39,59,69] Microstructure: any study that talked in depth about the microstructure of the alloys used and its effect on alloy properties and quality [7, 9-12, 15, 16, 18, 20, 22, 23, 29, 31, 32, 34, 35, 39, 46, 52, 54, 55, 57, 59, 67, 68, 72, 74, 76, 77, 79-84] Fracture mode: any study that talks about the fracture mechanisms, modes, and crack propagation taking place in superalloys [3, 10, 11, 13, 19, 20, 22, 30, 31, 37, 41, 43, 47, 53-55, 58, 59, 67, 77, 85] Ductility [37] Grain or dendrite size: any study that talks in depth about the grain or dendrite size, PDAS value, SDAS value, carbide size, or other precipitate sizes [11, 12, 16, 22, 34-36, 59, 66, 79, 80, 82, 86] Grain refinement: any study that talks about grain refinement, the process of refinement, and how and why the refinement takes place [16,17,34,48,49,80,87,88] Additive manufacturing: any study in which AM process was used [10] Hot isostatic pressing: any study in which the HIP process was used [3,14,58,67,89] Vacuum condition: any study that talked in depth about the effects of using vacuum conditions during casting procedure [26] Effect of alloying elements: any study that talks about the effects of different alloying elements and how varying their contents can affect the final product [7,40,42,55,59,73,76,77,82,83,90] Advances in Materials Science and Engineering…”

Section: Research Areamentioning

confidence: 99%

Recent Advancements in the Field of Ni‐Based Superalloys

Selvaraj

Sundaramali

Dev

et al. 2021

Advances in Materials Science and Engineering

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In this review article, research papers related to recent developments in Ni-superalloy technologies have been reviewed in order to provide an insight into recent achievements and the potential for further study, research, and development in this field. In this paper, studies on various aspects of Ni-based superalloys are reviewed, such as production methods, which include widely used casting methods, as well as unconventional alternative procedures, novel techniques, or simulation and prediction of certain alloy casting properties. Reviewing was done by categorising the papers into 4 major categories: manufacturing of Ni-based superalloys, effects of alloying elements, physical and mechanical properties of Ni-based superalloys, and defects in Ni-based superalloys. The process used to make Ni-superalloy parts can have a huge impact on the production process efficiency, the final product’s quality and properties, and the defects formed in it. Investment casting is one of the most common methods for making Ni-superalloy parts. Manufacturing covers studies on various casting methods used to make Ni-based superalloy components, novel techniques and methods developed to improve casting procedures to produce better products, and alternative manufacturing methods like AM and HIP processing. Similar to production process, the role of alloying elements is also very important. Even minor changes in their compositions can cause significant changes in the final product. Simultaneously, these alloying elements appear to be more efficient in the development of new methods to control product quality, suppress defect formation, and improve material properties such as the creep and fatigue. As a result, the effects of various alloying elements used in castings of Ni-based superalloys are thoroughly examined. A material’s properties are its most important components. They assist the industrialist in selecting or developing a material based on the needs of the application/use. With this in mind, many researchers have conducted extensive research on physical and mechanical properties, as well as how to improve them. Fatigue life, stress rupture, creep properties, impact ductility, strain response, stress relaxation behaviour, and so on are some of the most important physical and mechanical properties of Ni-superalloys. This article thoroughly reviews various studies on these properties, how and by what factors they are affected, and how they can be improved. Another important factor to consider when making Ni-superalloy castings is defect formation, which can affect the properties of the final product. Freckle defects, hot tears, porosities, and slivers are some of the major defects that occur in Ni-superalloys during the casting process. This article also reviews in detail about these defects, how they form, and how they affect the final product. These defects were found to have a significant influence on a variety of properties, such as creep, fatigue behaviour, and fracture mechanism. Topics and areas such as reinforcement of Ni-superalloys with the help of CNCs and 3D printing of Ni-superalloys that can provide scope for potential future research are highlighted based on the above-reviewed papers.

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“…Li et al [14] studied the effect of orientation on the creep behavior of the third-generation nickel-based single crystal superalloy at 850 • C. Zhao et al [15] studied the deformation and damage characteristics of the 4.5%Re/3.0%Ru nickel-based single crystal superalloy during creep. Song et al [16] studied the influence of Ru on the microstructure and creep properties of the two alloys. With the increasing amount of Ru, the creep fracture life of the alloy increased significantly.…”

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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Effect of ruthenium on microstructure and high-temperature creep properties of fourth generation Ni-based single-crystal superalloys

Cited by 39 publications

References 36 publications

Role of Ru on the Microstructural Evolution During Long-Term Aging of Ni-Based Single Crystal Superalloys

Role of Ru on the Microstructural Evolution During Long-Term Aging of Ni-Based Single Crystal Superalloys

Recent Advancements in the Field of Ni‐Based Superalloys

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

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