Manufacture and microstructural characterisation of bimetallic gas turbine discs

Klotz, Ulrich; Henderson, Monika; Wilcock, I. M.; Davies, S.; Janschek, Peter; Roth, Marcel; Gasser, Philippe; McColvin, G.

doi:10.1179/174328405x18629

Cited by 17 publications

(13 citation statements)

References 8 publications

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“…Klotz at al. deal with the isothermal forging of bi-metal gas turbine discs made of two different Ni-based superalloys from hot isostatically pressed billets [14]. Pfeiffer et al implemented the co-extrusion of non-centric steel-reinforced aluminium profiles with subsequent forging [15].…”

Section: Survey Of the Current Literaturementioning

confidence: 99%

Manufacturing of High-Performance Bi-Metal Bevel Gears by Combined Deposition Welding and Forging

Chugreeva

Mildebrath

Diefenbach

et al. 2018

Metals

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The present paper describes a new method concerning the production of hybrid bevel gears using the Tailored Forming technology. The main idea of the Tailored Forming involves the creation of bi-metal workpieces using a joining process prior to the forming step and targeted treatment of the resulting joint by thermo-mechanical processing during the subsequent forming at elevated temperatures. This improves the mechanical and geometrical properties of the joining zone. The aim is to produce components with a hybrid material system, where the high-quality and expensive material is located in highly stressed areas only. When used appropriately, it is possible to reduce costs by using fewer high-performance materials than in a component made of a single material. There is also the opportunity to significantly increase performance by combining special load-tailored high-performance materials. The core of the technology consists in the material-locking coating of semi-finished parts by means of plasma-transferred-arc welding (PTA) and subsequent forming. In the presented investigations, steel cylinders made of C22.8 are first coated with the higher-quality heat-treatable steel 41Cr4 using PTA-welding and then hot-formed in a forging process. It could be shown that the applied coating can be formed successfully by hot forging processes without suffering any damage or defects and that the previous weld structure is completely transformed into a homogeneous forming-typical structure. Thus, negative thermal influences of the welding process on the microstructure are completely neutralized.

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Section: Survey Of the Current Literaturementioning

confidence: 99%

Manufacturing of High-Performance Bi-Metal Bevel Gears by Combined Deposition Welding and Forging

Chugreeva

Mildebrath

Diefenbach

et al. 2018

Metals

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“…Some have used filler metal compatible with the two base metals to avoid the strength failure of the joining interface because of the component change [11][12]. Others have reinforced the welding interface by forging and heat treatment [2][3][4][5][13][14]. In this paper, the technique of near isothermal forging and gradient heat treatment is used to strengthen the welding interface.…”

Section: Introductionmentioning

confidence: 99%

Effect of near isothermal forging on the microstructure of Ti3Al/TC11 welding interface

2009

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The as-forged Ti 3 Al-based alloy and TC11 titanium alloy were welded by electron beams in vacuum, and then they were processed using near isothermal forging and gradient heat treatment. The experimental results show that the near isothermal forging processing parameters have little effect on the phase constitution of the weld. The weld consists of Ti 2 AlNb, MoNb, Nb 3 Al, and TiAl 3 phases as well as the two main phases of α and α 2 . However, the near isothermal forging processing parameters have significant effect on the shape, size, and volume fraction of α and α 2 phases of the welding interface. The sizes of the α and α 2 phases increase as the strain rate decreases. Because the distortion energy of the lattice and the volume fraction of the grains occurring in dynamic recrystallization increase with an increase in deformation, the sizes of the α and α 2 phases of the welding interface decrease.

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“…These parts require lighter weight and greater high temperature intensity for high efficiency of machine. Dual alloy disk, such as compressor disk used in aero-engine, will be possible to make by intermetallic compound alloy and two phases titanium alloy [1][2][3]. Because + two phase titanium alloy, such as TC11 alloy, has attractive properties with high specific strength, fracture toughness and good formability [ 4,5], it can be used as bore material of disk.…”

Section: Introductionmentioning

confidence: 99%

Changing of the Constituents and Microstructure at Dissimilar Alloy Tc11/Ti‐22Al‐25Nb Welding Interface

Zekun¹,

Qin²,

Zhao³

et al. 2016

Proceedings of the 13th World Conference on Titanium

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The operation temperature is higher, the temperature gradient and stress gradient of compressor disk is greater for aero-engine with great ratio of thrust to weight (or T/W). The disk that is made of unitary material is not to meet the demand. So the disk made of dissimilar alloy can come true. However, the strength of joint interface of dissimilar alloy is controlled by its structure constituents and microstructure. So it is very important to research the changing of constituents and microstructure at joint interface of dissimilar alloy during hot working and thermal exposure. Changing of the constituents and microstructure at TC11/Ti-22Al-25Nb dual-alloy welded interface gone through near thermal forging, heat treatment and thermal exposure has been investigated. The fusion zone of dual-alloy joint welded by EBW is composed of phase. After deformation and heat treatment, new phases are precipitated which the types influenced by the deformation temperatures. As deformation temperature rose, the O phase based on Ti2AlNb with Cmcm symmetry become more slender. Under thermal exposure, O phases in fusion zone grow up. As exposed at 700°C, the O phases coarsen obviously, and the thickness of O phase achieves 0.095 m. Meanwhile, the grain boundaries become thick and 2 phase precipitates in the grain boundaries. The constituents of fusion zone have been changed during thermal exposure, Al and Nb contents are basically unchanged while the Ti content decreases.

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Manufacture and microstructural characterisation of bimetallic gas turbine discs

Cited by 17 publications

References 8 publications

Manufacturing of High-Performance Bi-Metal Bevel Gears by Combined Deposition Welding and Forging

Manufacturing of High-Performance Bi-Metal Bevel Gears by Combined Deposition Welding and Forging

Effect of near isothermal forging on the microstructure of Ti3Al/TC11 welding interface

Changing of the Constituents and Microstructure at Dissimilar Alloy Tc11/Ti‐22Al‐25Nb Welding Interface

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