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Multidirectional forging method for high-alloyed high-temperature alloy sheared billet/biscuit

A multi-directional forging and superalloy technology, which is applied in the field of multi-directional forging of high-alloyed superalloy billets/cakes, can solve the problems of many deformation dead zones, restricting large-scale engineering applications, and long process routes. Guaranteed uniformity and consistency, easy industrial production, low process cost

Active Publication Date: 2017-06-20
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional casting & forging process is used to prepare nickel-based disc alloy billets. Firstly, large-scale ingots are prepared, and then billets / cake billets of required specifications are drawn through axial upsetting. According to the existing production situation of high-temperature alloy billets at home and abroad , there are several problems as follows. First, hot cracking of ingots with a higher degree of alloying is more common, which is mainly due to the central segregation (macro segregation) in the ingot, which can be directly inherited to the final product. , resulting in unreliable quality. Second, axial upsetting cannot completely solve the problem of uniformity control of the structure. There are more problems of deformation dead zone and more coarse grains and mixed crystals, which leads to a decrease in the ultrasonic detectability of the billet. The low inspection standard finally buried unsafe hidden dangers to the material quality
[0005] Although there is no problem in the control of composition and structure uniformity in the preparation of nickel-based disc alloy blanks by powder metallurgy route, the process route is longer, the cost is higher, and the risk of introducing inclusions is greater
At present, the United States adopts the argon atomization powder route and extrusion deformation process to solve the problem of inclusions, but my country is still insufficient in overcoming this shortcoming.
From the perspective of international development trends, the high cost of powder metallurgy process route preparation has limited its large-scale engineering application

Method used

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  • Multidirectional forging method for high-alloyed high-temperature alloy sheared billet/biscuit
  • Multidirectional forging method for high-alloyed high-temperature alloy sheared billet/biscuit
  • Multidirectional forging method for high-alloyed high-temperature alloy sheared billet/biscuit

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Experimental program
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Embodiment 1

[0050] The preparation size is The average grain size is ASTM grade 8-9 high-alloyed nickel-based alloy turbine disc cake blank forgings.

[0051] Nickel-based turbine disc alloy, its chemical composition is: C: 0.03wt%, Co: 13wt%, Cr: 16wt%, W: 4.2wt%, Mo: 3.9wt%, Ti: 3.7wt%, Al: 2.1wt% , B: 0.015wt%, Zr: 0.05wt%, Nb: 0.7wt%, Ta: 0%, Fe: ≤0.5wt%, and the balance is Ni and unavoidable impurities.

[0052] Such as figure 1 It is a specific flow chart of the multi-directional forging method of the present invention. The multi-directional forging method of the cake blank forging in embodiment 1 adopts the electroslag remelting continuous directional solidification technology (ESR-CDS) to prepare a directional solidified solidified iron with a diameter of 270 mm and a length of 1150 mm. Ingot casting mainly includes the following steps:

[0053] 1) The high-temperature homogenization treatment of low-segregation, high-purity directional solidification ingots must have four ste...

Embodiment 2

[0064] The preparation size is The average grain size of ASTM9-10 grade nickel-based turbine disk alloy rod stock forgings.

[0065] Nickel-based turbine disc alloy, its chemical composition is: C: 0.03wt%, Co: 20.5wt%, Cr: 13wt%, W: 2.1wt%, Mo: 3.8wt%, Ti: 3.7wt%, Al: 3.4wt% %, B: 0.015wt%, Zr: 0.05wt%, Nb: 0.9wt%, Ta: 2.4wt%, Fe: ≤0.5%, and the balance is Ni and unavoidable impurities.

[0066] The multidirectional forging method of the billet forging of embodiment 2 adopts the continuous directional solidification technology of electroslag remelting to prepare a diameter of 270mm, and a length of a directional solidified ingot of 1200mm mainly includes the following steps:

[0067] 1) Perform high-temperature homogenization treatment on the low-segregation, high-purity directional solidification ingot: there are four steps in the heating stage, the first step temperature is 400 °C for 2 hours, the second step temperature is 950 °C for 2 hours, and the second step temperat...

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Abstract

The invention relates to a forging method, in particular to a multidirectional forging method for obtaining a high-alloyed high-temperature alloy sheared billet / biscuit with the uniform and fine structure. The multidirectional forging method includes the following steps that (1) high-temperature homogenizing treatment is conducted on a low-segregation and high-purity controlled directional solidification ingot blank; (2) the controlled directional solidification ingot blank is subjected to upsetting and cogging; (3) the upset blank is forged into a cuboid blank; (4) multidirectional forging is conducted on the cuboid blank; (5) the blank subjected to multidirectional forging for multiple cycles is subjected to finishing, so that a shear billet / biscuit of the required size is obtained; and (6) the obtained shear billet / biscuit is subjected to physical and chemical testing. The multidirectional forging method is not only suitable for preparation of uniform and ultra-fine-grain high-alloyed nickel-based high-temperature alloy sheared billets for aviation, spaceflight and vessels, but also can be popularized to a steel mill to product high-speed steel and hot-working die steel, and the prepared ultra-fine-grain shear billets have the characteristic of uniform structure.

Description

technical field [0001] The invention relates to a forging method, in particular to a multi-directional forging method for obtaining a high-alloyed high-temperature alloy bar blank / cake blank with a uniform and fine structure. Background technique [0002] As the thrust of aero-engines continues to increase, nickel-based superalloy materials for advanced aero-engine turbine disks usually require alloys with a higher degree of alloying. Obtaining fine-grained rod blanks / cake blanks with uniform composition and structure is the key to preparing turbine disk forgings. It is an important foundation, and at the same time, it is the guarantee for the normal service of materials and the safety and reliability of engine operation. [0003] At present, there are two main production processes for billets / cakes used in the preparation of high-alloyed nickel-based superalloy turbine discs and other components: one is the traditional casting & forging process, that is, double vacuum (vacu...

Claims

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Application Information

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IPC IPC(8): B21J5/00B21J1/04B21J1/02C22C19/05
CPCB21J1/02B21J1/04B21J5/002C22C19/056
Inventor 付锐李福林
Owner CENT IRON & STEEL RES INST
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