Microstructure of an experimental Ni base superalloy under various casting conditions

El-Bagoury, Nader; Nofal, Adel

doi:10.1016/j.msea.2010.08.050

Cited by 35 publications

(24 citation statements)

References 28 publications

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“…The co-segregation of B, Cr, Mo and W assisted the formation of M 5 B 3 (CrMoW) 5 B 3 borides, shown in yellow in Figure 3c. Additionally, the lamellar η-Ni 3 Ti, indicated by orange, has previously been pointed out in studies of Ni-Co superalloy and IN738 [35][36][37]. Although the Nb and Al intensity in the microconstituents was not so intense (Figure 3b), the distribution of Nb and Al in the solidification product was consistent with that of Ti.…”

Section: Microstructural Examinationssupporting

confidence: 69%

“…In fact, platelet η and nodular σ phases have been observed in cast Ni-Cr-Co superalloys like IN738 [35][36][37]. The σ phase consists of high Co and Cr concentrations [41], besides, the plate-like σ enriched in Co and Cr nucleates around the grain boundaries of GTD-111 superalloy [42].…”

Section: Discussionmentioning

confidence: 99%

“…The σ phase consists of high Co and Cr concentrations [41], besides, the plate-like σ enriched in Co and Cr nucleates around the grain boundaries of GTD-111 superalloy [42]. Platelet and blocky η phases are also formed in IN738 [36] and in the interdendritic region of IN939 (Ni-Cr-Co) superalloy [43]. Local melting around the η phase occurs in the boundary region of IN939 at 1150 • C [43].…”

Section: Discussionmentioning

confidence: 99%

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Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Chen

Shiue

et al. 2018

Metals

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Abstract:The main scope of this study investigated the occurrence of liquation cracking in the heat-affected zone (HAZ) of IN738 superalloy weld, IN738 is widely used in gas turbine blades in land-based power plants. Microstructural examinations showed considerable amounts of γ' uniformly precipitated in the γ matrix. Electron probe microanalysis (EPMA) maps showed the γ-γ' colonies were rich in Al and Ti, but lean in other alloy elements. Moreover, the metal carbides (MC), fine borides (M 3 B 2 and M 5 B 3 ), η-Ni 3 Ti, σ (Cr-Co) and lamellar Ni 7 Zr 2 intermetallic compounds could be found at the interdendritic boundaries. The fracture morphologies and the corresponding EPMA maps confirmed that the liquation cracking in the HAZ of the IN738 superalloy weld resulted from the presence of complex microconstituents at the interdendritic boundaries.

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Section: Microstructural Examinationssupporting

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Chen

Shiue

et al. 2018

Metals

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“…eutectics (γ+γ') as well as the precipitation of intermetallic phases, i.e. MC, M₆C and M₂₃C₆ type carbides and M3B2 borides characterised by high contents of Cr, Mo, Ti and Ta and Ti(C,N) carbonitrides present in nickel superalloy grain boundaries during welding and surfacing [2,[13][14][15][16][17][18][19]. The objective of the research was to identify and characterise the most common imperfections present in overlay welds made in alloy Stellite 694 on the base material of nickel superalloy Inconel 738LC.…”

Section: Introductionmentioning

confidence: 99%

Laser Surfacing of Superalloy Inconel 738LC-Based Alloy Stellite 694 – Overlay Weld Imperfections

Gradzik

Nawrocki

Mrówka‐Nowotnik

et al. 2017

eBIS

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Abstract:The research involved the analysis of test results concerning the effect of laser surfacing process conditions on the characteristics of an overlay weld made of alloy Stellite 694 on the substrate of nickel superalloy Inconel 738LC as well as the determination and specification of the most common overlay weld imperfections. The overlay weld subjected to the tests was made using a Yb:YAG disc laser having a power of 1 kW and a filler metal in the form of powdered Stellite 694 cobalt alloy. The research led to the development of process conditions and the identification of major overlay weld imperfections including lacks of penetration, gas pores and microcracks in the base material. The formation of above-named imperfections could be ascribed to low laser radiation power density (< 30 kW/cm²), the excessive overlap of consecutive tracks (> 60% of the single track width) and the insufficient gas shielding of liquid metal in the weld pool.

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“…The numerical simulation technology not only can simulate the casting solidification process, temperature field, and defects, but also can reduce the development cycle, reduce the cost and save the labor [3][4][5][6]. In this paper, the numerical simulation of the mold filling and solidification process of the thin-wall baking is carried out based on the ProCAST software, and the improvement measures are put forward in order to solve the problem of shrinkage and improve the qualified rate of the products.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Optimization of Monolithic Casting Process for Thin-walled Baking Net

Hu¹,

Wang²,

Liu³

et al. 2017

dtetr

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1The long process of thin-walled burning barbecue net is simulated with mold filling and solidification process based on ProCAST software. The result shows that massive shrinkages consist in interior of the thin-walled baking net. According to the simulation result that by redesigning the structure of the pouring system, the optimized scheme can effectively reduce the number of shrinkages, so we can produce casting to meet the requirements.

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Microstructure of an experimental Ni base superalloy under various casting conditions

Cited by 35 publications

References 28 publications

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Laser Surfacing of Superalloy Inconel 738LC-Based Alloy Stellite 694 – Overlay Weld Imperfections

Numerical Simulation and Optimization of Monolithic Casting Process for Thin-walled Baking Net

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