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Method for preparing powder super-alloy by near net shape

A technology of superalloys and powders, which is applied in the field of near-net shape preparation of powdered superalloys, which can solve the problems of reducing the cost of raw material powders and process energy consumption, and achieve the effects of reducing oxygen content, avoiding oxidation, and reducing sintering temperature

Active Publication Date: 2013-08-14
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This method helps to solve the problem of product sintering deformation, and can also significantly reduce the cost of raw material powder and process energy consumption

Method used

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  • Method for preparing powder super-alloy by near net shape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Preparation of iron-based superalloy K213 in near-net shape

[0017] According to the composition of the iron-based superalloy K213 (35wt.%Ni, 15wt.%Cr, 1.8wt.%Al, 3.5wt.%Ti, 5wt.%W, 0.08wt.%B, 0.08wt.%C and the balance Fe) design master alloy, the content of matrix element Fe in the master alloy is 25wt.%, and the rest are active elements, where W Cr :W Al :W Ti :W B :W C =15:1.8:3.5:0.08:0.08). The master alloy is smelted in a vacuum induction melting furnace to obtain master alloy ingots. Next, the master alloy ingot is turned into chips, and the chips are broken into fine particles on a high-speed pulverizer. The fine particles were further refined by jet crushing, the gas pressure was 8 MPa, and the frequency of the sorting wheel was 60 Hz to obtain master alloy powder with an average particle size of 6.6 μm. In a high-purity Ar atmosphere (99.999%), fine-grained (2-10 μm) metal powders (such as carbonyl nickel powder, carbonyl iron powder, reduce...

Embodiment 2

[0018] Example 2: Preparation of Nickel-based superalloy K418 in near-net shape

[0019] The master alloy is designed according to the composition of the nickel-based superalloy K418 (13%Cr, 6.0%Al, 0.8%Ti, 4.2%Mo, 2.3%Nb, 0.04%B, 0.09%Zr, 0.08%C and the balance of Ni). The content of the matrix element Ni in the alloy is 30wt.%, and the rest are active elements. The mass ratio of each active element is: W Cr :W Al :W Ti :W Nb : W B :W Zr :W C=13:6:0.8:2.3:0.04:0.09:0.08). The master alloy is smelted in a vacuum induction melting furnace to obtain master alloy ingots. The master alloy is smelted in a vacuum induction melting furnace to obtain master alloy ingots. Next, the master alloy ingot is turned into chips, and the chips are broken into fine particles on a high-speed pulverizer. The fine particles are further refined by jet crushing, the gas pressure is 6MPa, the frequency of the sorting wheel is 50Hz, and the master alloy powder with an average particle size of...

Embodiment 3

[0020] Example 3: Preparation of nickel-based superalloy René104 in near-net shape

[0021] According to the composition of nickel-based superalloy René104 (20%Co, 13%Cr, 3.8%Mo, 3.4%Al, 3.7%Ti, 2.1%W, 0.9Nb, 0.05%C, 0.025%B, 0.05%Zr, 2.4% Ta and the balance Ni) to design a master alloy, the content of the matrix element Ni in the master alloy is 35wt.%, and the rest are active elements, and the mass ratio of each active element is: W Cr :W Al :W Ti :W Nb :W C :W B :W Zr :W Ta =13:3.4:3.7:0.9:0.05:0.025:0.05:2.4). The master alloy is smelted in a vacuum induction melting furnace to obtain master alloy ingots. The master alloy is smelted in a vacuum induction melting furnace to obtain master alloy ingots. Next, the master alloy ingot is turned into chips, and the chips are broken into fine particles on a high-speed pulverizer. The fine particles were further refined by jet crushing, the gas pressure was 5 MPa, and the frequency of the sorting wheel was 40 Hz to obtain...

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Abstract

Disclosed is a method for preparing powder super-alloy by a near net shape. Firstly, high-purity intermediate alloy powder is prepared by the aid of vacuum melting and air jet pulverization technology. Secondly, the intermediate alloy powder and fine particle diameter metal powder (such as carbonyl nickel powder, carbonyl iron powder, reduction tungsten powder and reduction molybdenum powder) are mixed in a high-energy ball mill with protective atmosphere to obtain mixed powder. The mixed powder and paraffin base binders are uniformly premixed, feedstock with a uniform rheological performance is obtained by mixing and is formed on an injection forming machine to obtain a blank in a complicated shape. The binders are removed from the blank in the complicated shape by the aid of solvent degreasing and hot degreasing technologies, the degreased blank is sintered in the vacuum atmosphere, the sintered blank is further compacted by the aid of unjacketed hot isostatic pressure, and finally, a super-alloy part in the complicated shape is obtained by the aid of solid solution and aging treatment. Raw material powder cost and technological energy consumption are remarkably reduced, and prepared super-alloy is almost fully compact, uniform in structure and excellent in comprehensive mechanical property.

Description

technical field [0001] The invention belongs to the technical field of powder injection molding, and particularly provides a method for preparing a powder superalloy in a near-net shape. Background technique [0002] Powder superalloys have good high-temperature strength, oxidation and corrosion resistance, excellent fatigue and creep resistance, fracture performance and structural stability, and are irreplaceable key materials for many modern defense equipment and national economic construction. Powder superalloys have a high degree of alloying, and traditional casting products often have serious composition segregation and uneven structure, so that their performance cannot be fully exerted. Compared with cast superalloys, powder superalloys have the advantages of uniform structure composition, no macro segregation, etc., and their comprehensive properties are more excellent. The traditional process of preparing powder superalloy parts generally uses the process of "atomiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/00C22C1/04C22C33/02
Inventor 曲选辉章林秦明礼
Owner UNIV OF SCI & TECH BEIJING
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