Investigations on the fracture behavior of Inconel 718 superalloys obtained from cast and additive manufacturing processes

Vieille, B.; Keller, Clément; Mokhtari, Morgane; Briatta, H.; Breteau, T.; Nguejio, Josiane; Barbe, Fabrice; Azzouna, M. Ben; Baustert, Eric

doi:10.1016/j.msea.2020.139666

Cited by 29 publications

(8 citation statements)

References 40 publications

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“…As stated by Urdanpilleta et al [ 35 ], grain boundary sliding is recognized as one of the main mechanisms driving the strain rate sensitivity behavior of Inconel 718. In the as-cast samples, the resulting microstructure is expected to be more homogeneous compared to the as-built ones due to the lower cooling rate, exhibiting equiaxed grain formation with no preferred growth direction [ 36 , 37 ]. On the contrary, in the as-built samples due to the higher cooling rates and the unidirectional deposition, the resulting microstructure is widely accepted and demonstrated to be anisotropic and mainly composed by columnar dendrites along the building direction [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

Laser Metal Deposition of Inconel 718 Alloy and As-built Mechanical Properties Compared to Casting

et al. 2021

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In the last years, powder-based Laser Metal Deposition (LMD) has been attracting attention as a disruptive Additive Manufacturing (AM) technique for both the fabrication and restoration of Inconel 718 components, enabling to overcome current limitations faced by conventional manufacturing processes in terms of manufacturing costs, tool wear, and lead time. Nevertheless, the uncertainty related to the final mechanical performance of the as-built LMD parts limits a wider adoption of such technology at industrial level. This research work focuses on the mechanical characterization of as-built Inconel 718 specimens through split Hopkinson tensile bar tests performed at different strain rate conditions. The influence of laser power on the final mechanical behavior of the as-built tensile samples is discussed and compared with the mechanical response of as-cast ones. The as-built specimens exhibit a high internal density (i.e., 99.92% and 99.90% for 300 W and 400 W, respectively) and a more ductile behavior compared to the as-cast ones for every evaluated strain rate condition. The strain hardening capacity of the as-built samples increases with the laser power involved in the LMD process, reaching an average Yield Strength of 703 MPa for specimens realized at 400 W and tested at 800/s.

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Section: Resultsmentioning

confidence: 99%

Laser Metal Deposition of Inconel 718 Alloy and As-built Mechanical Properties Compared to Casting

et al. 2021

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“…The J represents the energy required per unit increase of fracture surface area. 21 The fracture toughness is calculated from the J-R curve by drawing an intersection between the J-R curve and offset line at a distance of 0.2 mm with slope Mσ y , where σ y (flow stress) is the average of yield strength and UTS. 20,22 The unloading-compliance method was chosen to observe the crack growth in the FCGR test.…”

Section: Methodsmentioning

confidence: 99%

Experimental studies of fracture and fatigue crack growth in dissimilar metal welded joints of nickel-based superalloys: Cracks oriented along the weld

Saju

Velu

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Nickel-based superalloys, Inconel 718 and Nimonic 80A, were welded without any interlayer for Blisk manufacturing in aerospace industries. Fracture toughness and fatigue crack growth rate of the dissimilar metal welded joints were experimentally studied to confirm their structural integrity. Cracks were oriented in and along the weld. Base metals, Inconel 718, and Nimonic 80A differ in yield strength but have the same modulus of elasticity. Electron beam welding was used to butt weld Inconel 718 to Nimonic 80A. J resistance curve ( J vs. crack extension) was experimentally found to determine the elastic–plastic fracture toughness. The welded specimens showed lesser fracture toughness and higher crack growth rates than base metals. An increase in load ratio resulted in an increase in fatigue crack growth rate in the high Δ K region and a decrease in Δ Kth. Fractography studies confirmed linear elastic and plane strain fracture all along the fatigue crack growth rate path except for the final fracture with plane stress.

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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%

“…Heat treatment: any study that talks in depth about different heat treatment processes and their effects on the properties of the final casting [10,23,24,33,55,57,66,67,82] Advances in Materials Science and Engineering direction, resulting in a continuous and unbroken crystal lattice. DS is mostly obtained by casting with the assistance of a Bridgman furnace where the movement of the casting from the hot chamber to the cold chamber during solidification promotes grain growth in one direction.…”

Section: Research Areamentioning

confidence: 99%

“…So, it was seen to be crucial to have precipitation of an average amount of delta phase since it undertakes a huge part in the plasticity of SLM-processed sample. e study [10] investigated how the fracture behaviour at room temperature for IN718 superalloy is affected by manufacturing processes.…”

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

confidence: 99%

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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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Investigations on the fracture behavior of Inconel 718 superalloys obtained from cast and additive manufacturing processes

Cited by 29 publications

References 40 publications

Laser Metal Deposition of Inconel 718 Alloy and As-built Mechanical Properties Compared to Casting

Laser Metal Deposition of Inconel 718 Alloy and As-built Mechanical Properties Compared to Casting

Experimental studies of fracture and fatigue crack growth in dissimilar metal welded joints of nickel-based superalloys: Cracks oriented along the weld

Recent Advancements in the Field of Ni‐Based Superalloys

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