Metallurgical Factors Influencing the Machinability of Inconel 718

Schirra, J.J.; Viens, D.V.

doi:10.7449/1994/superalloys_1994_827_838

Cited by 13 publications

(11 citation statements)

References 3 publications

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“…Hard particles like carbides in the work material cause abrasion on the tool. Like other studies, the tool wear measurements confirmed the hypothesis that carbide forming elements affect the machinability [6]. Titanium and niobium in Inconel 718 form primary carbides that are abrasive and bulky precipitates.…”

Section: Materials Behaviour During Machiningsupporting

confidence: 83%

Material Properties Affecting the Machinability of Inconel 718

Krook¹,

Recina²,

Karlsson³

2005

Superalloys 718, 625, 706 and Various Derivatives (2005)

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The machinability of Inconel 718 was studied. In part I, wear on cemented carbide tool inserts from turning operations on low pressure turbine cases were measured and correlated to material properties like chemical composition, microstructure and strength. This study showed that carbide forming elements like titanium and niobium are affecting the machinability negatively. Carbides are hard and abrasive particles that wear down the tool inserts. It was also concluded that strength are of minor importance to machinability on fully heat treated Inconel 718 in the range tested. In part II, the influence of microstructure on machinability was studied on designed work material. It was concluded that grain size has a large impact on machinability due to deformation hardening. It was also seen that the role of-phase seems to be of minor importance for the machinability.

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Section: Materials Behaviour During Machiningsupporting

confidence: 83%

Material Properties Affecting the Machinability of Inconel 718

Krook¹,

Recina²,

Karlsson³

2005

Superalloys 718, 625, 706 and Various Derivatives (2005)

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“…Because of the large volume of Alloy 7 18 used by P&W and the extensive machining required, P&W and the United Technologies Research Center expended significant effort to understand the metallurgical factors which influence the machinability of this alloy (7). Factors such as fabrication technique (wrought, cast, or cast + HIP), hardness, grain size and carbon content were studied and all were found to influence machinability ( Figure 13).…”

Section: Machinabilitymentioning

confidence: 99%

Alloy 718 at Pratt & Whitney: Historical Perspective and Future Challenges

Paulonis¹,

Schirra²

2001

Superalloys 718, 625, 706 and Various Derivatives (2001)

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104

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The introduction of Alloy 71 8 at P&W in the early 1960's represented a significant advance in gas turbine engine technology, enabling the manufacture of engines with lower cost, lighter weight and simplified construction. This paper traces the applications and evolution of this unique material over the last four decades at P&W, along with some of the reasons for its introduction. From its initial use in 1963 for the diffuser case of the 558 engine for the SR-71 Blackbird, the alloy is now the most widely used of all nickel alloys at P&W. Applications include disks, cases, shafts, blades, stators, seals, supports, tubes and fasteners. Some of the key studies conducted at P&W to increase our understanding of the alloy and to improve its properties, uniformity and quality are also described. Additional challenges remain, however, if we are to exploit this alloy system even further into the 21St century. Most notable among these include a need for improved understanding and process models to allow us to tailor properties to specific applications, and the development of a higher temperature derivative. An alloy is needed which would retain all of the property, cost and fabricability advantages of 718, but with greater resistance to overaging to allow a 50-100F (28-56C) increase in use temperature.

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“…The detrimental Nb-rich intermetallic Laves phase is formed in the interdendritic regions and embrittles the material [17]. Deposition processes with lower heat input and higher cooling rates produce lower fractions of the Laves phase, and consequently, better material properties [18,19]. Gonzalez et al [20] performed a comparative analysis of powder-bed-based additive manufacturing (AM) technologies during the production of metallic components using Inconel 625 powder material.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Machining Process of Inconel 718 Parts Manufactured by Laser Metal Deposition

et al. 2019

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Laser metal deposition (LMD) is an additive manufacturing process that allows the manufacturing of near-net-shape products. This could mean significant savings in terms of materials and costs in the manufacturing of high-performance components for the aeronautical industry. In this work, an analysis of how the LMD processing of alloy 718 affects the final machining has been carried out. For this purpose, a comparative study has been done by means of the monitoring of the end milling process of a part manufactured by LMD and a rough-milled part from forged material. Differences between process outputs such as chip morphology and cutting forces were studied. Material characteristics such as microstructure, hardness and mechanical properties were also analyzed.

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Metallurgical Factors Influencing the Machinability of Inconel 718

Cited by 13 publications

References 3 publications

Material Properties Affecting the Machinability of Inconel 718

Material Properties Affecting the Machinability of Inconel 718

Alloy 718 at Pratt & Whitney: Historical Perspective and Future Challenges

Analysis of the Machining Process of Inconel 718 Parts Manufactured by Laser Metal Deposition

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