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Preparation method of superfine high-grade spherical EP741NP alloy powder

A technology of alloy powder and ultrafine powder, which is applied in the field of preparation of super-spherical EP741NP alloy powder, which can solve problems such as excessive grain size, excessive particle size, and poor powder shape.

Inactive Publication Date: 2016-06-01
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a method to solve the problems of insufficient performance due to excessive grain size and poor deformability due to poor powder shape during the preparation of EP741NP alloy by powder metallurgy process. , and problems such as poor circularity and excessive particle size of the alloy powder produced by the currently commonly used powder making method

Method used

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  • Preparation method of superfine high-grade spherical EP741NP alloy powder
  • Preparation method of superfine high-grade spherical EP741NP alloy powder
  • Preparation method of superfine high-grade spherical EP741NP alloy powder

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Experimental program
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Effect test

Embodiment 1

[0024] An ultra-fine high-grade spherical The preparation method of EP741NP alloy powder comprises the following steps:

[0025] 1) According to the ingredients of EP741NP, C: 0.034%, Co: 16.4%, Cr: 9.15%, Al: 5.08%, Ti: 1.92%, W: 5.31%, Mo: 3.92%, Nb: 2.70, Hf: 0.25%, Ni balance, smelted into EP741NP alloy rods by vacuum induction melting and electroslag remelting process;

[0026] 2) The smelted EP741NP alloy rod is fine-turned. The processed electrode rod is: 50mm in diameter, 650mm in length, 0.02mm in roundness deviation, 0.045mm / 650mm in straightness deviation, and 1.14μm in roughness;

[0027] 3) Load the electrode rod into the reaction chamber, and evacuate the reaction chamber to 2×10 -3 Pa, fill the reaction chamber with helium, so that the pressure in the chamber is 0.5MPa;

[0028] 4) The power of the plasma gun of PREP powder making equipment is 200kW. The plasma torch contains tungsten cathode and copper anode. The electrode rod is not used as an electrode. Th...

Embodiment 2

[0032] An ultra-fine high-grade spherical The preparation method of EP741NP alloy powder comprises the following steps:

[0033] 1) According to the ingredients of EP741NP, C: 0.046%, Co: 16.0%, Cr: 8.92%, Al: 4.90%, Ti: 1.80%, W: 5.51%, Mo: 4.22%, Nb: 2.42, Hf: 0.29%, the remainder of Ni, smelted into EP741NP alloy rods.

[0034] 2) The smelted EP741NP alloy rod is fine-turned. The processed electrode rod is: 20mm in diameter, 300mm in length, 0.02mm in roundness deviation, 0.03mm / 300mm in straightness deviation, and 0.58μm in roughness ;

[0035] 3) Load the electrode rod into the reaction chamber, and evacuate the reaction chamber to 7×10 -3 Pa, fill the reaction chamber with helium, so that the pressure in the chamber is 0.07MPa;

[0036] 4) The power of the plasma gun of PREP powder making equipment is 100kW. The plasma torch contains tungsten cathode and copper anode. The electrode rod is not used as an electrode. The plasma heats the end of the electrode rod. Melti...

Embodiment 3

[0041] An ultra-fine high-grade spherical The preparation method of EP741NP alloy powder comprises the following steps:

[0042] 1) According to the ingredients of EP741NP, C: 0.038%, Co: 15.8%, Cr: 9.36%, Al: 4.84%, Ti: 1.95%, W: 5.28%, Mo: 4.14%, Nb: 2.50, Hf: 0.23%, Ni balance, smelted into EP741NP alloy rod;

[0043]2) The smelted EP741NP alloy rod is fine-turned. The processed electrode rod is: 95mm in diameter, 900mm in length, 0.07mm in roundness deviation, 0.07mm / 900mm in straightness deviation, and 0.86μm in roughness;

[0044] 3) Load the electrode rod into the reaction chamber, and evacuate the reaction chamber to 3×10 -3 Pa, fill the reaction chamber with helium, so that the pressure in the chamber is 0.2MPa;

[0045] 4) The power of the plasma gun of PREP powder making equipment is 300kW. The plasma torch contains tungsten cathode and copper anode. The electrode rod is not used as an electrode. The plasma heats the end of the electrode rod. Melting, the atomiz...

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Abstract

The invention relates to a preparation method of superfine high-grade spherical EP741NP alloy powder. The method comprises the following steps: 1) proportionally preparing materials according to the EP741NP alloy composition, and smelting to obtain an EP741NP alloy bar; 2) processing the smelted EP741NP alloy bar into an electrode bar; 3) installing the electrode bar into a reaction chamber, vacuumizing the reaction chamber, and proportionally charging inert gas into the reaction chamber; 4) heating the end of an electrode bar to uniformly melt the end, throwing atomized liquid drops from the end of the electrode bar so that the liquid drops are quickly cooled into spherical particles in an inert gas atmosphere and fall into a collector, wherein a plasma torch comprises a tungsten cathode and a copper anode, and the electrode bar is not used as an electrode; and 5) carrying out electrostatic separation on the prepared EP741NP alloy powder in an inert gas protective atmosphere, screening, sampling and packaging. The EP741NP alloy powder prepared by the method is superfine, and has the characteristics of high purity, high-grade sphericity and no hollow powder or satellite powder.

Description

technical field [0001] The invention belongs to the technical field of superalloy powder metallurgy preparation, and in particular relates to a method for preparing ultrafine high-grade spherical EP741NP alloy powder. Background technique [0002] EP741NP is a nickel-based superalloy, its composition has distinctive characteristics: high Ti, Al, Nb content, γ′ phase content reaches more than 60%, which ensures the strength of the alloy, and the alloy has a very low Ti / Al Ratio, while adding strong carbide forming elements Hf, Nb, etc., reduces the formation tendency of the original grain boundary, and adds a large amount of refractory elements such as W and Mo. The traditional EP741NP alloy preparation process is PREP powder making + direct hot isostatic pressing + heat treatment. The unique composition characteristics ensure that the alloy has good creep resistance and fatigue performance. Since the 1980s, it has been widely used in key hot-end parts of aerospace. [0003...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/02B22F9/10
CPCC22C19/057B22F9/10B22F2999/00C22C1/023B22F2202/13
Inventor 闫飞王庆相韩志宇梁书锦张平祥左振博相敏王琦莫茗焜
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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