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A method for preparing nickel-based powder superalloy by spark plasma sintering

A discharge plasma, nickel-based powder technology, applied in the field of powder metallurgy materials, can solve problems such as the appearance of original particle boundaries, reduced mechanical properties of alloys, easy grain growth, etc., to inhibit the growth of grains, achieve metallurgical bonding, The effect of simple process route

Active Publication Date: 2017-09-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Currently, hot isostatic pressing or hot extrusion + isothermal forging is used to prepare nickel-based powder superalloys with complex process, long time-consuming and high preparation costs.
Hot isostatic pressing is used to prepare powder superalloys. Due to the long holding time, the grains are easy to grow, and the oxygen adsorbed on the surface of the powder is easy to react with the active elements in the alloy, forming oxides at the boundaries of powder particles, resulting in the original Grain boundaries, reducing the mechanical properties of the alloy

Method used

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  • A method for preparing nickel-based powder superalloy by spark plasma sintering
  • A method for preparing nickel-based powder superalloy by spark plasma sintering
  • A method for preparing nickel-based powder superalloy by spark plasma sintering

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Embodiment 1

[0039] Plasma sintering of argon atomized nickel-based pre-alloyed powder (composition: Ni-20.6Co-13Cr-3.8Mo-2.1W-3.4Al-3.9Ti-2.4Ta-0.9Nb (wt%)) at 1150°C / 40MPa , heat preservation for 5min, and prepare a billet; then perform solution treatment: 1180°C / 1h, aging treatment: 815°C / 8h, to obtain a nickel-based superalloy.

[0040] The mechanical properties of the alloy at room temperature are: fracture strength 1273MPa; yield strength 906MPa; elongation 10.65%; density 8.1735g / cm 3 . The microstructure of the alloy is shown in the appendix image 3 , 4 , the grain size level is ASTM10 level, and the original grain boundary is basically eliminated.

Embodiment 2

[0042]Plasma sintering of argon atomized nickel-based pre-alloyed powder (composition: Ni-20.6Co-13Cr-3.8Mo-2.1W-3.4Al-3.9Ti-2.4Ta-0.9Nb (wt%)) at 1100°C / 60MPa , heat preservation for 10min, and prepare a billet; then perform solution treatment: 1115°C / 1h+1170°C / 3h, aging treatment: 845°C / 8h+760°C / 8h, to obtain a nickel-based superalloy.

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Abstract

The invention discloses a method for preparing nickel-based powder superalloy through spark plasma sintering, and belongs to the field of powder metallurgy materials. The spark plasma sintering process is adopted for sintering forming of atomized nickel-based superalloy powder, and then solid solution treatment and aging treatment are carried out to obtain the nickel-based powder superalloy. The spark plasma sintering process is adopted for preparing the nickel-based powder superalloy, rapid sintering forming of the powder is achieved, growth of grains can be effectively restrained, and the prepared superalloy is provided with the fine and uniform equiaxial structure; through powder surface discharge activation and rapid diffusion bonding, formation of complex carbides and oxides on the boundaries of powder particles is restrained, and original particle boundaries are eliminated; the method is simple in process route, preparation time is short, the second phase is small in size and uniform in distribution, and the mechanical property is good.

Description

technical field [0001] The invention relates to a method for preparing a nickel-based powder superalloy by discharge plasma sintering, which belongs to the field of powder metallurgy materials. Background technique [0002] Nickel-based powder superalloy has the characteristics of fine grain, uniform structure, no macro-segregation, high alloying degree, high yield strength and excellent fatigue performance. It is the material of choice for manufacturing advanced engine hot-end parts. [0003] The preparation of nickel-based powder superalloy mainly includes two technical routes. One is the preparation process of "argon atomization (AA) powder hot extrusion (HEX) forming + isothermal forging (ITF)" in countries such as Europe and the United States; the other is Russia and other countries mainly adopt the preparation process of "Plasma Rotating Electrode (PREP) Powder Direct Hot Isostatic Pressing (As-HIP) Forming". [0004] In 1972, P&WA Company of the United States first p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105C22C1/05C22C19/03
CPCY02P10/25
Inventor 刘祖铭苏鹏飞麻梦梅郭旸段然曦王帅辜恩泽段清龙
Owner CENT SOUTH UNIV
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