Review on welding and fracture of nickel based superalloys

Saju, Tom; Velu, M.

doi:10.1016/j.matpr.2020.11.334

Cited by 11 publications

(8 citation statements)

References 77 publications

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“…Most studies focus on the roles of B, C, and Zr in creep resistance, [56,63,64] fatigue crack growth, [85,245,246] casting, [9,11,150] and welding [107,183,247] or AM processes. [57,62,183,248,249] Fewer studies provide in-depth knowledge about these elements during cast and wrought processing. [26,27,40,222] Fluidity improvements are recorded for B and C during casting and (re-)melting.…”

Section: Processability and Propertiesmentioning

confidence: 99%

“…Yang et al [31] reviewed inclusions in cast and wrought Ni-based superalloys but acknowledged that more research is required to gain a more complete understanding of their thermodynamic and kinetic properties. Welding and additive manufacturing (AM) of Ni-based superalloys have been reviewed extensively, [60][61][62] but process conditions and phase transformation kinetics vary considerably from cast and wrought processing. The impact of B, C, and Zr on the creep resistance of Ni-based superalloys is studied most frequently.…”

Section: Introductionmentioning

confidence: 99%

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Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

et al. 2022

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Cast and wrought Ni‐based superalloys are materials of choice for harsh high‐temperature environments of aircraft engines and gas turbines. Their compositional complexity requires sophisticated thermo‐mechanical processing. A typical microstructure consists of a polycrystalline γ‐matrix, strengthening Ni3(Al,Ti) γ′ precipitates, carbides (MC, M6C, and M23C6), borides (M2B, M3B2, and M5B3), and other inclusions. Microalloying additions of B, C, and Zr commonly improve high‐temperature strength and creep resistance, although excessive additions are detrimental. Grain boundary (GB) segregation may improve cohesion and displace embrittling impurities. Finely dispersed carbides and borides are desired to control grain size via GB pinning. However, excessive decoration of GBs may lead to failure during processing and in‐service. Hence, a systematic review on the roles of B, C, and Zr in cast and wrought Ni‐based superalloys is required. The current state of knowledge on GB segregation and precipitation is reviewed. Experimental and modeling results are compared across various processing steps. The impact of GB precipitation on mechanical properties is most well researched. Co‐precipitation in proximity to GBs interacting with local microstructure evolution and mechanical properties remains less explored. Addressing these gaps in knowledge allows a more complete understanding of processing–microstructure–properties relationships in advanced cast and wrought Ni‐based superalloys.

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Section: Processability and Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

et al. 2022

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“…[8][9][10] As a high energy density fusion welding technique, EBW has been shown to provide good weld quality for the joining of GH4169 Ni-based superalloy. 11 In recent decades, many scholars are devoted to obtaining GH4169 welded joints without macroscopic defects and well metallurgical bonding. 10,[12][13][14][15] In fact, previous studies have attempted to improve the mechanical properties of EBW joints by weakening the weld texture.…”

Section: Introductionmentioning

confidence: 99%

“…It is the most widely used Ni‐based superalloy, which has good weldability due to the sluggish precipitation kinetics of γ″ precipitates 8–10 . As a high energy density fusion welding technique, EBW has been shown to provide good weld quality for the joining of GH4169 Ni‐based superalloy 11 . In recent decades, many scholars are devoted to obtaining GH4169 welded joints without macroscopic defects and well metallurgical bonding 10,12–15 …”

Section: Introductionmentioning

confidence: 99%

Effect of texture evolution and defect on the crack initiation of a Ni‐based superalloy electron beam welded joint

Wen,

Liu,

Jiang

et al. 2023

Fatigue Fract Eng Mat Struct

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Electron beam welding (EBW), a high‐quality and precise joining process, is widely used in aerospace manufacturing. In this study, through in situ scanning electron microscope (SEM) fatigue experiments and X‐ray computed tomography (CT) scanning technology, we revealed the fatigue crack initiation and propagation mechanism in GH4169 superalloy EBW joints under different post‐welding heat treatment conditions. The welded pores have a decisive effect on the fatigue properties of direct aging treatment welded joints. Fatigue cracks initiate from pore defects on the surface or in the subsurface. Due to the heterogeneous microstructure in weld seam, fatigue cracks tend to grow along the primary dendrite axis and secondary dendrite arms. Besides, in homogenization and aging treatment specimen, intergranular fatigue cracks tend to nucleate in the slip zone of large grains and twin boundaries. Although homogenization treatment can eliminate segregation, it also results in significant grain growth in both weld seam and base material.

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“…For this reason, in nickel superalloys, grain boundaries are reinforced with carbide precipitates, mainly of the M23C6 type [1][2][3][4][5][6]. Researches on nickel and nickel alloys are currently continued in a wide range [7][8][9][10][11][12][13][14][15][16]. They concern welding technologies, such as: soldering, welding of construction elements operated in high temperature and aggressive environment [10], welding of Ni alloys with non-alloy steels and structural analysis of welded joints, as well as joining bimetal with a layer clad with Ni alloys [12,16], or laser welding of finned tubes with Inconel 625 superalloy [13] and formation of surface layers by thermal spraying and welding [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Structure and Hardness Analysis of Inconel 625 Nickel Superalloy Welded by Tig Method

Rzeźnikiewicz,

Górka

2023

IJMMT

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The aim of the work was to determine the structure and hardness of the parent material, the heat affected zone and the weld in butt joints of thin sheets with a thickness of 1.0 mm made of Inconel 625 nickel superalloy welded by TIG (tungsten inert gas) method. Test joints were made with different linear welding energy in the range of 70 - 145 J/mm. The obtained welded joints were subjected to visual tested, macroscopic metallographic examinations, observations of the structure on a light microscope, observations of the structure in a scanning electron microscope and a hardness measurement. The geometrical parameters of the joints were also specified. Chemical composition of structural components of selected areas of the weld, heat affected zone and parent material was determined by surface and point X-ray microanalysis. The range of linear energy was determined in which joints of thin sheets made of the tested superalloys in laboratory conditions show the best quality.

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Review on welding and fracture of nickel based superalloys

Cited by 11 publications

References 77 publications

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

Effect of texture evolution and defect on the crack initiation of a Ni‐based superalloy electron beam welded joint

Structure and Hardness Analysis of Inconel 625 Nickel Superalloy Welded by Tig Method

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