Lessons Learned from the Development, Application and Advancement of Alloy 718

Preli, Francis R.; Furrer, David

doi:10.1002/9781119016854.ch1

Cited by 7 publications

(2 citation statements)

References 15 publications

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“…Historically, the most widely used polycrystalline Ni-base superalloy has been IN718 [6,7]. This alloy derives its exceptional strength from dispersions of γʺ precipitates (≈ 18 vol.%).…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behaviour of New Nickel-Base Superalloys with Varying Aluminium: Niobium Ratio

Wise

Hardy

Church

et al. 2023

High Temperature Corrosion of mater.

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New Ni-base superalloys with higher temperature capability are required for future, more efficient gas turbine engines. In designing such alloys, careful consideration is required of the elemental concentrations to ensure that a suitable balance of mechanical properties and environmental resistance is obtained. In this study, the oxidation resistance of a series of new Ni-base superalloys with varying Al:Nb ratio has been assessed through long-term exposures in air at elevated temperature. The oxide scale has been characterised using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and quantitative measurements of oxide scale dimensions. The alloys were found to form continuous chromia scales at 700°C and outperformed several current commercial superalloys. However, following exposure at 800°C, significant microstructural degradation was observed due to precipitation of the δ phase.

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Section: Introductionmentioning

confidence: 99%

Oxidation Behaviour of New Nickel-Base Superalloys with Varying Aluminium: Niobium Ratio

Wise

Hardy

Church

et al. 2023

High Temperature Corrosion of mater.

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show abstract

“…Rocket propellants often contain extremely harsh chemicals that produce large amounts of energy by the combination and expulsion of high temperature and pressure flow. IN718 is resistant to deformations and degradation when exposed to high temperatures (Pollock and Tin, 2006;Loria, 1989) or corrosive environments (Preli and Furrer, 2014;Thomas et al, 2006). Although it is a very hard material to conventionally manufacture, it is one of the few materials that can be fabricated via metal additive manufacturing, making it a great candidate for this application.…”

Section: Introductionmentioning

confidence: 99%

Understanding surface roughness of additively manufactured nickel superalloy for space applications

Shelton

Stelzer

Hartsfield

et al. 2019

RPJ

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Purpose For many applications, including space applications, the usability and performance of a component is dependent on the surface topology of the additively manufactured part. The purpose of this paper is to present an investigation into minimizing the residual surface roughness of direct metal laser sintering (DMLS) samples by manipulating the input process parameters. Design/methodology/approach First, the ability to manipulate surface roughness by modifying processing parameters was explored. Next, the surface topography was characterized to quantify roughness. Finally, microthruster nozzles were created both additively and conventionally for flow testing and comparison. Findings Surface roughness of DMLS samples was found to be highly dependent on the laser power and scan speed. Because of unintended partially sintered particles adhering to the surface, a localized laser fluence mechanism was explored. Experimental results show that surface roughness is influenced by the varied parameters but is not a completely fluence driven process; therefore, a relationship between laser fluence and surface roughness can be incorporated but not completely assumed. Originality/value This paper serves as an aid in understanding the importance of surface roughness and the mechanisms associated with DMLS. Rather than exploring a more common global energy density, a localized laser fluence was initiated. Moreover, the methodology and conclusions can be used when optimizing parts via metal additive manufacturing.

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The Influence of Hot Corrosion Damage on the Low Cycle Fatigue Fracture Modes of a Disk Superalloy

2020

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Lessons Learned from the Development, Application and Advancement of Alloy 718

Cited by 7 publications

References 15 publications

Oxidation Behaviour of New Nickel-Base Superalloys with Varying Aluminium: Niobium Ratio

Oxidation Behaviour of New Nickel-Base Superalloys with Varying Aluminium: Niobium Ratio

Understanding surface roughness of additively manufactured nickel superalloy for space applications

The Influence of Hot Corrosion Damage on the Low Cycle Fatigue Fracture Modes of a Disk Superalloy

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