Primary α phase and its effect on the impact ductility of a high Cr content cast Ni-base superalloy

Zheng, Liang; Xiao, Chengbo; Zhang, Guoqing; Han, Bo; Tang, Dingzhong

doi:10.1016/j.jallcom.2012.02.166

Cited by 31 publications

(5 citation statements)

References 18 publications

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“…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%

“…is article has extensively and narratively reviewed many studies that have investigated these characteristics of Ni-based superalloys. One such study [83] investigates the characteristics and transformation of the primary phase and its effect on impact ductility on Ni-superalloy K4648, which has enriched Cr content. Here, the primary α-(Cr, Ni) phase was seen to exist in the K4648 alloy's as-cast microstructure, which is an oversaturated solid solution of Ni, W, and Mo in Cr.…”

Section: Physical and Mechanical Properties And Behaviour Of Ni-based Superalloysmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Research Areamentioning

confidence: 99%

Section: Physical and Mechanical Properties And Behaviour Of Ni-based Superalloysmentioning

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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“…A high chromium content Ni-based superalloy (K4648) was cast via VIM to examine the effects of casting conditions on a-Cr Ni precipitation within the g matrix (9). This alloy is used for diffuser and vector jet nozzle components in gas turbines but is subject to the formation of brittle a-Cr Ni precipitates and oxide inclusions.…”

Section: Vacuum Casting Of Ni-based Alloysmentioning

confidence: 99%

Advanced Casting Methodologies

Kapranos

Brabazon

Midson³

et al. 2014

Comprehensive Materials Processing

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“…A high Cr content increases the protection against sulfidation, but leads to the formation of a body-centered cubic (bcc) α-Cr phase in the diffusion zone between substrate and coating, as shown in former investigations. [4][5][6][7] α-Cr has a higher melting point and a lower coefficient of thermal expansion compared with β-NiAl, reducing thermal stresses. [8,9] Furthermore, the fracture toughness is known to be higher for pure α-Cr and Cr alloys compared with β-NiAl.…”

Section: Introductionmentioning

confidence: 99%

Microcantilever Fracture Tests of α‐Cr Containing NiAl Bond Coats

et al. 2022

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MCrAlY bond coats are widely used as oxidation‐resistant coatings on superalloys. The major phase is the thermally stable intermetallic β‐NiAl phase. The addition of Cr increases the oxidation and corrosion resistance but leads to the formation of α‐Cr precipitates. Both phases are brittle and limit the fracture toughness of these coatings. To study the influence of thermal exposure and the resulting changing chemical composition on the fracture properties, the fracture toughness of both phases is measured by notched microcantilever bending, after processing and after oxidation by thermal cycling. The fracture toughness of β‐NiAl decreases during thermal cycling due to the depletion in Al, whereas the fracture toughness and the composition of α‐Cr stay constant. As the fracture toughness of α‐Cr is lower compared with β‐NiAl, the formation of α‐Cr precipitates is supposed to decrease the fracture toughness of the bond coat.

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Primary α phase and its effect on the impact ductility of a high Cr content cast Ni-base superalloy

Cited by 31 publications

References 18 publications

Recent Advancements in the Field of Ni‐Based Superalloys

Recent Advancements in the Field of Ni‐Based Superalloys

Advanced Casting Methodologies

Microcantilever Fracture Tests of α‐Cr Containing NiAl Bond Coats

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