An analytical algorithm to predict weldability of precipitation-strengthened nickel-base superalloys

Moosavy, Homam Naffakh; Aboutalebi, M.R.; Seyedein, S.H.

doi:10.1016/j.jmatprotec.2012.06.010

Cited by 26 publications

(6 citation statements)

References 12 publications

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“…Dupont 39 and Moosavy et al 40 could predict the susceptibility of nickel based superalloys to the hot cracking by utilising an analytical solidification model. This model has enabled comparing the superalloys together in order to rank them from the weldability viewpoint.…”

Section: Resultsmentioning

confidence: 99%

Comparative study on dissimilar welding of Inconel 718 and Udimet 500 precipitation strengthened nickel based superalloys

Moosavy

Aboutalebi

Seyedein

et al. 2014

Materials Science and Technology

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Microstructural, mechanical and weldability aspects in the similar and dissimilar welds of alloy 718 and alloy 500 nickel based superalloys have been investigated. Alloy 500 weld metal showed high tendency of titanium to the segregation. Coalescence of the microvoids led to propagation of hot solidification microfissures. The alloy 718 weld metal displayed the formation of Nb rich low melting eutectic type morphologies, which can reduce the weldability. The microstructure of dissimilar weld metal with dilution of 65 wt- displayed semideveloped dendritic boundaries. The less segregation and decrease in the low melting eutectics caused less susceptibility of dissimilar weld to solidification cracking. The segregation elimination phenomenon has occurred in the heat affected zone of alloy 500. In the partially melted zone, remelted and resolidified regions have been observed. These locations provided sites for nucleation of liquation cracks. For the alloy 718 heat affected zone, dissolution of γ″-Ni3Nb needle-like precipitations has taken place. It was the chief reason for sharp decline of the microhardness. The heat affected zone of alloy 500 revealed intense liquation cracking, in which the crack is initiated at the partially melted zone. The hot liquation cracking in the heat affected zone of Alloy 718 was observed as a result of γ″-Ni3Nb dissolution.

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Section: Resultsmentioning

confidence: 99%

Comparative study on dissimilar welding of Inconel 718 and Udimet 500 precipitation strengthened nickel based superalloys

Moosavy

Aboutalebi

Seyedein

et al. 2014

Materials Science and Technology

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“…These systems tend to be the 'unweldable' high-volume fraction γ containing alloys. As previously discussed, the high γ content of these alloys ( ≥ 30%) increases the susceptibility to several cracking mechanisms, most notably strain-age cracking [25,84]. It is often difficult to avoid such reheating during multipass welding or AM techniques, leading to the 'unweldable' term being applied to these systems [25,27].…”

Section: Alloy Design For Crack Mitigationmentioning

confidence: 99%

Applications of alloy design to cracking resistance of additively manufactured Ni-based alloys

Markanday

2022

Materials Science and Technology

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Utilisation of additive manufacturing (AM) for the fabrication of Ni-based alloys has seen a massive uptake in both academic and commercial institutions. However, processing of traditional Ni-based superalloys through AM has encountered numerous cracking issues. The primary forms of cracking include solidification, solid-state and liquation mechanisms. Many of these forms of cracking are influenced by the compositions, with certain Ni-based systems showing impressive resistance. The design of novel alloys systems specifically tuned for processing through AM might be necessary to realise the potential of these techniques. Recently, researchers have taken advantage of improved computational alloy design frameworks. These frameworks utilise methods such as neural networks to analyse massive volumes of data and predict compositions that might satisfy specific design criteria.

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“…Nickel-based superalloys are widely used as hot parts in important industries, such as aerospace engines, land-based gas turbines and nuclear reactors, due to their superior strength, considerable creep resistance, good corrosion resistance and microstructural stability at elevated temperatures [1][2][3]. These excellent properties are attributed to high alloying, which typically contains more than five different alloying elements.…”

Section: Introductionmentioning

confidence: 99%

The Role of Solidified Phases on the Hot Cracking of a Large-Size GH4742 Superalloy Ingot

Zhang,

Wang,

Liu

et al. 2024

Materials

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The effect of solidified phases on the hot cracking behaviour of a large-size GH4742 superalloy ingot produced using vacuum induction melting (VIM) is investigated in order to improve the quality of the final product. The results show that the solidification order of the ingot is γ matrix, MC carbide, η phase and γ′ phase. Among them, the MC carbide and the η phase solidified in the mushy zone. The volume fraction of both the η phase and the MC carbide in the cracked zone is higher than that in the non-cracked zone, and a significant number of η phases are distributed near the hot cracks. The formation of solidified phases not only induces stress concentration at η phase/γ matrix interfaces but also reduces the ability of liquid feeding during solidification, thus promoting hot crack formation. It is believed that by controlling the segregation degree of both Nb and Ti, the volume fraction of η phases and MC carbides can be reduced to prevent hot cracking of the GH4742 superalloy VIM ingot.

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An analytical algorithm to predict weldability of precipitation-strengthened nickel-base superalloys

Cited by 26 publications

References 12 publications

Comparative study on dissimilar welding of Inconel 718 and Udimet 500 precipitation strengthened nickel based superalloys

Comparative study on dissimilar welding of Inconel 718 and Udimet 500 precipitation strengthened nickel based superalloys

Applications of alloy design to cracking resistance of additively manufactured Ni-based alloys

The Role of Solidified Phases on the Hot Cracking of a Large-Size GH4742 Superalloy Ingot

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