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Equal-channel extrusion mold for forming powder superalloy blank

A technology of equal-channel extrusion and high-temperature alloys, which is applied in metal extrusion dies, metal extrusion mandrels, etc., can solve problems such as harsh experimental conditions, complicated process, and coarse grain size, and achieve comprehensive mechanical properties. Reduced production costs and strong versatility

Inactive Publication Date: 2013-12-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of coarse grain size of preparation materials, harsh experimental conditions, and complicated process in the prior art, the present invention proposes an equal-channel extrusion die for powder superalloy blanks, which can be used to prepare fine-grained , Uniform structure, no macro segregation, high degree of alloying, good yield strength and fatigue performance powder superalloy billet

Method used

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  • Equal-channel extrusion mold for forming powder superalloy blank
  • Equal-channel extrusion mold for forming powder superalloy blank
  • Equal-channel extrusion mold for forming powder superalloy blank

Examples

Experimental program
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Effect test

Embodiment 1

[0020] This example is an equal-channel extrusion die for powder superalloy billet production, which is used to prepare powder superalloy FGH96 forging billets with a diameter of 300mm and uniform structure of 5-3 grades. The equipment is an isothermal forging hydraulic press with a tonnage of 5000T. . Heat the forging billet to 1070°C in a heating furnace, put it into the mold and make the axis of the forging billet coincide with the centerline of the billet extrusion device.

[0021] refer to Figure 1-Figure 5 , the cavity of the equal-channel extrusion die of the present invention is divided into a truncated conical guide section 1, a deformation torsion transition section 2, and a circular shaping section 3; wherein: the cavity of the truncated conical guide section 1 is a variable-diameter circular channel with a smooth inner diameter . In the frustum-shaped guide section 1, the circular diameter of the initial section at the entrance is 360mm, the diameter at the circ...

Embodiment 2

[0023]This embodiment is an equal-channel extrusion die for powder superalloy billet production, which is used to prepare a powder superalloy FGH96 forging billet with a diameter of 600 mm and a grain size of 5 to 3. The equipment is an isothermal forging hydraulic press of 25,000 tons. Heat the forging billet to 1150°C in a heating furnace, put it into the mold and make the axis of the forging billet coincide with the centerline of the billet extrusion device. The cavity of the channel extrusion mold is divided into a frustum-shaped guiding section 1, a deformation and twisting transition section 2, and a circular shaping section 3. Wherein, the cavity of the truncated conical guide section 1 is a variable-diameter circular channel with a smooth inner diameter. In the frustum-shaped guide section 1, the circular diameter of the initial section at the entrance is 720mm, the diameter of the circular termination section A-A is equal to 600mm, and the section in the middle stage ...

Embodiment 3

[0025] This embodiment is used to prepare powdered superalloy FGH95 forging billets with grain diameter of 300mm and uniform structure of grade 5-3. The equipment is an isothermal forging hydraulic press with a tonnage of 6000T. Heat the forging billet to 1100°C in a heating furnace, put it into the mold and make the axis of the forging billet coincide with the centerline of the billet extrusion device. The cavity of the channel extrusion die is divided into a frustum-shaped guiding section 1, a deformation and twisting transition section 2, and a circular shaping section 3. Wherein, the cavity of the truncated conical guide section 1 is a variable-diameter circular channel with a smooth inner diameter. In the frustum-shaped guide section 1, the circular diameter of the initial section at the entrance is 360 mm, the diameter of the circular termination section A-A is equal to 300 mm, and the section in the middle stage transitions smoothly. The length of the cone-shaped guide...

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Abstract

The invention discloses an equal-channel extrusion mold for forming a powder superalloy blank, which is specifically used for improving the organizational characteristics of a powder superalloy blank. After a forging blank enters the mold, the round section of the forging blank is twisted to be elliptical and then to be round again, the deformation is combination of twisting and shearing deformation and extruding deformation, and thus the combination of multiple deformation modes in one-pass extruding process is realized. At the transitional section of deformation and twisting, due to the twisting deformation of the elliptical twisting surface, the blank rotates and is subjected to shearing strain under the action of shearing stress so as to realize shearing and crushing of crystal grains and further achieve the effect of refining the grains; simultaneously, since the blank is limited by a mold cavity, the intracrystalline deformation of the blank in the state of pressure stress is difficult, and thus the development of various original microscopic defects in a deformed body can be inhibited; since the refining effect of the grains in the extruding process is obvious, original grain boundaries are eliminated thoroughly, and the comprehensive mechanical property of the powder superalloy blank is obviously improved.

Description

technical field [0001] The invention relates to the technical field of billet making of powder superalloy, in particular to an equal-channel extrusion die for billet making of powder superalloy. Background technique [0002] With the development of aerospace, shipbuilding, and automobile industries, powder metallurgy technology is widely used in the manufacture of turbine disks and blades of aviation, marine and industrial gas turbines, and has achieved rapid development. A proven, reliable method. The preparation of high-performance superalloy blanks is the key process link and preparation basis in the development and production of advanced aero-engines. Only when the billet is made reasonably can its formability, serviceability and process reliability be guaranteed in the subsequent forming and heat treatment process. When producing and preparing superalloys by powder metallurgy, each powder particle is rapidly condensed from a small amount of liquid metal, and its compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C25/08
Inventor 董俊哲李付国王磊汪程鹏杨雅静
Owner NORTHWESTERN POLYTECHNICAL UNIV
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