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Mechanical alloying method for preparing strengthened dispersion alloy of nickel-based oxide

A technology of mechanical alloying and dispersion strengthening, which is applied in the field of preparing new nickel-based oxide dispersion strengthening alloys, and achieves the effects of easy volume fraction, significant strengthening effect, and good application prospects.

Inactive Publication Date: 2011-01-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the problem of ODS nickel-based superalloys is that the particle size of the oxide dispersed phase (15-50nm) is smaller than that of Y in iron-based ODS alloys. 2 Ti 2 o 7 The dispersed phase (3nm) is much coarser, this is because the Y 2 o 3 It is easy to react with solid solution Al to form a series of Y-Al-O complex oxides (Al 2 Y 4 o 9 、Al 5 Y 3 o 12 and AlYO 3 ), and a small amount of Al 2 o 3 coarsening occurs

Method used

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  • Mechanical alloying method for preparing strengthened dispersion alloy of nickel-based oxide
  • Mechanical alloying method for preparing strengthened dispersion alloy of nickel-based oxide
  • Mechanical alloying method for preparing strengthened dispersion alloy of nickel-based oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: A new nickel-based ODS alloy with 1.5% by weight of Hf added.

[0019] First, Ni-13wt%Co-15wt%Cr-4wt%Mo-4wt%W-2.2wt%Al-3.7wt%Ti-0.8wt%Nb-0.03wt%C were weighed according to the composition ratio , and then add 1% by weight of oxide particles (Y 2 o 3 ) and 1.5% by weight of oxide refining elements (Hf). Next, the element mixed powder is packaged in a glove box, using high-purity helium (99.999%) as a protective atmosphere. Y by mechanical alloying 2 o 3 The particles are evenly dispersed in the nickel matrix; at the same time, 2% by weight of stearic acid is added as a process control agent to prevent the powder from adhering to the inner wall of the ball mill during the high energy ball milling process. The rotating speed of the ball mill was 400 rpm, and the ball milling time was 48 hours. The alloy powder after high-energy ball milling is vacuum-coated with low-carbon steel, and then densified on a hot isostatic pressing device. The hot isostatic pres...

Embodiment 2

[0020] Example 2: A new nickel-based ODS alloy prepared by sub-solid solution + slow cooling and heat treatment (25° C. / min).

[0021] First, Ni-13wt%Co-15wt%Cr-4wt%Mo-4wt%W-2.2wt%Al-3.7wt%Ti-0.8wt%Nb-0.03wt%C were weighed according to the composition ratio , and then add 1% by weight of oxide particles (Y 2 o 3 ) and 1.5% by weight of oxide refining elements (Hf). Next, the element mixed powder was packaged in a glove box, using high-purity argon (99.999%) as a protective atmosphere. Y by mechanical alloying 2 o 3 The particles are uniformly dispersed in the nickel matrix; at the same time, 1% by weight of stearic acid is added as a process control agent to prevent the powder from adhering to the inner wall of the ball mill during the high-energy ball milling process. The rotating speed of the ball mill was 400 rpm, and the ball milling time was 60 hours. The alloy powder after high-energy ball milling is vacuum-coated with low-carbon steel, and then densified on a hot ...

Embodiment 3

[0022] Example 3: A new nickel-based ODS alloy prepared by solid solution + rapid cooling and heat treatment (800° C. / min).

[0023] First, Ni-13wt%Co-15wt%Cr-4wt%Mo-4wt%W-2.2wt%Al-3.7wt%Ti-0.8wt%Nb-0.03wt%C were weighed according to the composition ratio , and then add 1% by weight of oxide particles (Y 2 o 3 ) and 1.5% by weight of oxide refining elements (Hf). Next, the element mixed powder was packaged in a glove box, using high-purity argon (99.999%) as a protective atmosphere. Y by mechanical alloying 2 o 3 The particles are uniformly dispersed in the nickel matrix; meanwhile, 3% by weight of stearic acid is added as a process control agent to prevent the powder from adhering to the inner wall of the ball mill during the high energy ball milling process. The rotating speed of the ball mill was 400 rpm, and the ball milling time was 72 hours. The alloy powder after high-energy ball milling is vacuum-coated with low-carbon steel, and then densified on a hot isostatic...

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Abstract

The invention discloses a mechanical alloying method for preparing strengthened dispersion alloy of nickel-based oxide, belonging to the field of metal matrix composite. The process flow of the method is as follows: uniformly pre-mixing FGH96 alloy element powder, oxide refined element (Hf) and oxide dispersed phase (Y2O3) the particle size of which is 20-30nm; uniformly dispersing nanometer Y2O3 particles in nickel matrix under high purity Ar atmosphere through high energy ball milling; coating the alloy powder after high energy ball milling with low carbon steel and performing hot isostatic pressing at 950-1200 DEG C; and performing solid solution heat treatment at 950-1200 DEG C and aging heat treatment at 600-900 DEG C on samples after hot isostatic pressing to obtain a final nanophase enhanced composite material. The advantages of the method are mainly reflected in that the components of FGH96 alloy are taken as basic components, and element Hf is added to form Y2Hf2O7 complex oxide to inhabit the formation of Y-Al-O complex oxide, so that the disperse phase is refined to 5-13nm. The volume percentage of gamma' phase after heat treatment can reach as high as 38-45%.

Description

technical field [0001] The invention belongs to the research field of metal matrix composite materials, and particularly provides a method for preparing a novel nickel-based oxide dispersion strengthening (Oxide Dispersion Strengthening, ODS) alloy. Background technique [0002] ODS alloy is an important high-temperature structural material for energy use, and ODS steel is the most researched at present. The research and development of ODS alloys has been very active in Japan, Europe and the United States, and China has paid more and more attention to basic research in this field in recent years. [0003] Taking ODS ferritic steel as an example, because it has a BCC crystal structure, it still has a very low radiation swelling rate under the neutron irradiation condition of 200dpa, coupled with excellent oxidation resistance and corrosion resistance, ODS ferritic steel Body steel can be used for cladding materials, first wall materials and high-temperature structural parts ...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/05
Inventor 章林何新波曲选辉秦明礼
Owner UNIV OF SCI & TECH BEIJING
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