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Flat-mold hot extrusion process of nickel-based powder superalloy

A nickel-based superalloy and superalloy technology, applied in the field of powder metallurgy materials, can solve problems such as poor plasticity, and achieve the effects of reducing resistance, reducing surface quality deterioration, and reducing resistance

Inactive Publication Date: 2021-08-27
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because superalloys still have high strength at high temperatures, and their plasticity is not good

Method used

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  • Flat-mold hot extrusion process of nickel-based powder superalloy
  • Flat-mold hot extrusion process of nickel-based powder superalloy
  • Flat-mold hot extrusion process of nickel-based powder superalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This example provides a flat-die hot extrusion process for nickel-based powder superalloy FGH4096. For the FGH4096 rod, the plasma rotating electrode method (PREP) is used to make powder, and the prepared powder is screened and electrostatically removed. Ensure that the powder particle size distribution range is 15~53μm, and the inclusion content is less than 3 pieces / 500g.

[0042] The prepared qualified powder is packed in a stainless steel sheath 4, and subjected to vacuum degassing and sealing welding treatment, wherein the stainless steel sheath 4 is metallurgically bonded 316 stainless steel.

[0043] Heat the stainless steel sheath 4 filled with powder to 1070° C. in a hot isostatic pressing furnace, keep it warm for 3 hours, and perform hot isostatic pressing to obtain a billet.

[0044] Apply antioxidant evenly to the surface of the billet (including the stainless steel sheath 4) obtained after hot isostatic pressing, then heat to 250°C, keep it warm for 3 hours,...

Embodiment 2

[0049] This example provides another flat-die hot extrusion process for nickel-based powder superalloy FGH4096. For FGH4096 rods, the plasma rotating electrode method (PREP) is used to make powder, and the prepared powder is screened and electrostatically removed. , to ensure that the powder particle size distribution range is 15~53μm, and the inclusion content is less than 3 / 500g.

[0050] The prepared qualified powder is packed in a stainless steel sheath 4, and subjected to vacuum degassing and sealing welding treatment, wherein the stainless steel sheath 4 is metallurgically bonded 316 stainless steel.

[0051] Heat the stainless steel sheath 4 filled with powder to 1100° C. in a hot isostatic pressing furnace, keep it warm for 4 hours, and obtain a billet after hot isostatic pressing.

[0052] Apply antioxidant evenly to the surface of the billet (including the stainless steel sheath 4) obtained after hot isostatic pressing, then heat to 220°C, keep it warm for 4 hours, a...

Embodiment 3

[0057] This example provides another flat-die hot extrusion process for nickel-based powder superalloy FGH4096. For FGH4096 rods, the plasma rotating electrode method (PREP) is used to make powder, and the prepared powder is screened and electrostatically removed. , to ensure that the powder particle size distribution range is 15~53μm, and the inclusion content is less than 3 / 500g.

[0058] The prepared qualified powder is packed in a stainless steel sheath 4, and subjected to vacuum degassing and sealing welding treatment, wherein the stainless steel sheath 4 is metallurgically bonded 316 stainless steel.

[0059] Heat the stainless steel sheath 4 filled with powder to 1130° C. in a hot isostatic pressing furnace, keep it warm for 2 hours, and perform hot isostatic pressing to obtain a billet.

[0060] Apply an antioxidant evenly to the surface of the billet (including the stainless steel sheath 4) obtained after hot isostatic pressing, then heat to 200°C, keep it warm for 2 ...

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Abstract

The invention belongs to the technical field of powder metallurgy materials, and relates to a flat-mold hot extrusion process of nickel-based powder superalloy FGH4096. The surface of a nickel-based powder superalloy FGH4096 blank subjected to hot isostatic pressing treatment is uniformly coated with an antioxidant, so that the oxidation of the blank after high-temperature heating can be greatly reduced, the oxide skin on the surface of the blank is reduced, the resistance in the extrusion process can be reduced, and the phenomenon that the surface quality of an extruded bar becomes poor due to too much oxide skin can be reduced; in addition, the transfer time of the blank from discharging to an extrusion workbench is controlled to be less than or equal to 50s, and a glass lubricant is quickly and uniformly sprayed on the surface of the blank during the period, so that the resistance in the extrusion process is reduced, and the resistance is reduced. According to the process, cracking in the hot extrusion process of the blank can be avoided, original particle boundary substances (PPB) are eliminated, heat-induced holes are closed, grains are refined, distribution of precipitated phases is adjusted, meanwhile, plasticity can be improved, and the fatigue life can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy materials, and relates to a nickel-based powder superalloy, in particular to a flat-die hot extrusion process of the nickel-based powder superalloy FGH4096. Background technique [0002] Nickel-based powder superalloy is a nickel-based superalloy prepared by powder metallurgy technology. It has the advantages of uniform structure, no macro-segregation, high alloying degree, high yield strength, good oxidation resistance and fatigue resistance, so it is a thermal structure. One of the commonly used materials for parts. As a typical second-generation powder superalloy, FGH4096 superalloy has high creep strength, crack growth resistance and damage tolerance, and its maximum service temperature can reach 530 °C. The high-pressure turbine discs, sealing rings and powder discs manufactured by it are widely used in hot-end components such as aero-engine turbine discs. [0003] The hot extrusi...

Claims

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Application Information

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IPC IPC(8): B22F3/15B22F3/20B22F3/24B22F9/14C22C1/04
CPCB22F3/15B22F3/20B22F3/24B22F9/14B22F2003/208B22F2003/248C22C1/0433
Inventor 陈蕾蕾瞿宗宏宋嘉明白瑞敏罗成赖运金王庆相梁书锦
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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