High Performance Machining of Profiled Slots in Nickel-Based-Superalloys

Vogtel, P.; Klocke, Fritz; Lung, Dieter

doi:10.1016/j.procir.2014.03.061

Cited by 20 publications

(14 citation statements)

References 6 publications

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“…Moreover, the cutting forces are reduced due to the higher cutting speeds compared to HSS. Cemented carbides with different cobalt contents were investigated by Vogtel et al [226] in analogy orthogonal cutting experiments on a broaching machine tool, using Inconel 718 as workpiece material. A cobalt content of 10% showed a higher tool life than 6% cobalt at both cutting speeds of v c = 10 and 20 m/min as the occurrence of micro cracks at the flank face could be avoided, Fig.…”

Section: Ni-based Superalloysmentioning

confidence: 99%

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High performance cutting of advanced aerospace alloys and composite materials

M’Saoubi¹,

et al. 2015

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Section: Ni-based Superalloysmentioning

confidence: 99%

“…Tool wear formation for WC-6Co and WC-10Co in orthogonal cutting of Inconel 718 (v c = 10 m/min, f = 0.075 mm)[226].…”

mentioning

confidence: 99%

High performance cutting of advanced aerospace alloys and composite materials

M’Saoubi¹,

et al. 2015

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“…11. In recent years, milling and wire electrical discharge machining (WEDM), as more flexible machining techniques, have been intensively discussed in turbo machinery industries as alternatives other than broaching for the production of complex slots on turbine engine components [33,34]. More introduction with respect to the process of WEDM will be given in the next Section 4.2.…”

Section: Turning and Millingmentioning

confidence: 99%

Surface Integrity and Fatigue Performance of Nickel-based Superalloys

Chen¹

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Gas turbines are widely used in e.g., power generation, and aero-industries. Due to global warming, the demand for more efficient gas turbines has increased. A way to achieve this is by increasing the operating temperature of gas turbines. Therefore, nickel-based superalloys have been developed to withstand these extreme temperatures and loads, especially in the hot sections.Today, the way of operating land-based gas turbines is changing. Instead of running for long periods of time, the operation is becoming more flexible, with everincreasing cyclic loads and number of start and stop cycles. To handle the increased stress and cycles, component resistance to fatigue failure needs to be improved.Surface integrity is critical to fatigue performance, since fatigue cracks are normally initiated at surfaces. Nickel-based superalloys are difficult-to-machine materials, primarily due to their high strength, high tendency for work-hardening, and low thermal conductivity. The machining process changes the surface integrity of the alloys which can result in worse fatigue resistance.The work presented in this Ph.D. thesis was conducted in collaboration with Siemens Industrial Turbomachinery AB in Finspång, Sweden. Surface integrity changes which are induced during machining and their effects on fatigue performance have been studied on alloy Inconel 718. Inconel 718 is a widely-used nickel-based superalloy for high temperature applications in modern gas turbines.Broaching, milling, and wire electrical discharge machining, related to component manufacturing in turbo machinery industries, were included in this study. Surface irregularity and defects induced by machining provide preferential sites for fatigue crack initiation which influence the fatigue performance of the alloy. If compressive residual stresses are induced during machining, they benefit the fatigue life by retarding fatigue crack initiation away from surface regions. Shot peening was performed on machined Inconel 718, by which high compressive residual stresses are deliberately induced. It results in increased fatigue performance. The high iv temperatures in gas turbines generally deteriorate the surface integrity. For instance, recrystallization often occurs in the highly plastically-deformed surface layer. Microstructural degradation, in a form of α-Cr precipitates, have also been observed in the deformed surface and sub-surface microstructure when subjected to thermal exposure. Oxidation at elevated temperatures was found to degrade the surface integrity and thereby also the fatigue performance. Fatigue cracks are preferably initiated at oxidized surface carbides, if thermal exposure has been made prior to the test, and a reduced fatigue life is often obtained. It is even worse when high temperatures relax the beneficial compressive residual stresses induced by shotpeening and thereby lowering the fatigue resistance. This increases the interest for research regarding how to optimize the shot peening process in order to enhance the thermal stability o...

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“…On the basis of the analyzed literature in the field of surface quality [3][4][5][6][7]10], it was found necessary to carry out studies showing the influence of the path type on the roughness and waviness of the surface obtained.…”

Section: Quality Surface Of Groove Walls In Trochoichidal Milling Promentioning

confidence: 99%

Influence of the Trochoidal Tool Path on Quality Surface of Groove Walls

Waszczuk¹,

Skowronek²,

Karolczak³

et al. 2019

Adv. Sci. Technol. Res. J.

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The article presents the results of machining materials in hardened state. In the paper, different trochoidal tool paths are compared with each other and with the conventional milling. The results of measurements show the relationship between tool path, roughness and waviness of grooves wall. The paper also presents pictures of grooves which were made. These results provide comparative material useful in the choice of the best milling strategy to the cutting process.

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High Performance Machining of Profiled Slots in Nickel-Based-Superalloys

Cited by 20 publications

References 6 publications

High performance cutting of advanced aerospace alloys and composite materials

High performance cutting of advanced aerospace alloys and composite materials

Surface Integrity and Fatigue Performance of Nickel-based Superalloys

Influence of the Trochoidal Tool Path on Quality Surface of Groove Walls

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