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Method for preparing oxide dispersion strengthened cobalt-based super alloy

A technology of cobalt-based superalloy and dispersion strengthening, which is applied in the field of metal matrix composites to achieve uniform microstructure and improve medium-temperature strength

Inactive Publication Date: 2011-02-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far there has been no study on ODS cobalt-based superalloys

Method used

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  • Method for preparing oxide dispersion strengthened cobalt-based super alloy
  • Method for preparing oxide dispersion strengthened cobalt-based super alloy
  • Method for preparing oxide dispersion strengthened cobalt-based super alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: A novel cobalt-based ODS alloy with a γ′ phase volume fraction of 37% was prepared.

[0015] Use Y with a particle size of 20-30nm 2 o 3 Powder and high-purity Co powder, Al powder, W powder as raw materials. The composition of a new cobalt-based ODS alloy is designed to be 3.7 wt% Al, 21.1 wt% W, 1 wt% Y 2 o 3 , 1.5% by weight Hf and the balance Co. Firstly, Co powder, γ′ phase forming elements (Al, W), oxide refining elements (Hf) and oxide disperse phase (Y 2 o 3 ) premixed evenly, and then Y 2 o 3 The particles are evenly dispersed in the Co matrix, the speed of the ball mill is 480 rpm, and the ball milling time is 48 hours; then the alloy powder after high-energy ball milling is covered with a low-carbon steel ladle and hot isostatically pressed at 1150 ° C for 3 hours. The samples after hot isostatic pressing are subjected to solution heat treatment (1300°C×2h) and aging heat treatment (700°C×24h) to obtain the final nanophase-reinforced compos...

Embodiment 2

[0016] Example 2: Preparation of a novel cobalt-based ODS alloy with a γ′ phase volume fraction of 45%.

[0017] Use Y with a particle size of 20-30nm 2 o 3 Powder and high-purity Co powder, Al powder, W powder as raw materials. The composition of the new cobalt-based ODS alloy is designed to be 3.6 wt% Al, 26.8 wt% W, 1 wt% Y 2 o 3 , 2% by weight Hf and the balance Co. Firstly, Co powder, γ′ phase forming elements (Al, W), oxide refining elements (Hf) and oxide disperse phase (Y2 o 3 ) premixed evenly, and then Y 2 o 3 The particles were uniformly dispersed in the Co matrix, the speed of the ball mill was 480 rpm, and the ball milling time was 60 hours; then the alloy powder after high-energy ball milling was covered with a low-carbon steel ladle and hot isostatic pressed at 1150°C for 1 hour. The samples after hot isostatic pressing are subjected to solution heat treatment (1300°C×2h) and aging heat treatment (900°C×24h) to obtain the final nanophase-reinforced compos...

Embodiment 3

[0018] Embodiment 3: Preparation Y 2 o 3 A novel cobalt-based ODS alloy with a content of 0.8% by weight.

[0019] Use Y with a particle size of 20-30nm 2 o 3 Powder and high-purity Co powder, Al powder, W powder as raw materials. The composition of the new cobalt-based ODS alloy is designed to be 3.6 wt% Al, 26.8 wt% W, 0.8 wt% Y 2 o 3 , 1.5% by weight Hf and the balance Co. Firstly, Co powder, γ′ phase forming elements (Al, W), oxide refining elements (Hf) and oxide disperse phase (Y 2 o 3 ) premixed evenly, and then Y 2 o 3 The particles were evenly dispersed in the Co matrix, the speed of the ball mill was 480 rpm, and the ball milling time was 72 hours; then the alloy powder after high-energy ball milling was covered with a low-carbon steel ladle and hot isostatically pressed at 1200°C for 2 hours. The samples after hot isostatic pressing are subjected to solution heat treatment (1300°C×2h) and aging heat treatment (900°C×24h) to obtain the final nanophase-reinf...

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Abstract

The invention discloses a method for preparing oxide dispersion strengthened cobalt-based super alloy, and belongs to the field of metal-based composite materials. The preparation method comprises the following steps of: pre-mixing Co powder, gamma-phase forming elements (Al and W), oxide thinning element (Hf) and oxide dispersion phase (Y2O3) with grain diameter of 30 to 30 nanometers uniformly, then uniformly dispersing Y2O3 granules into the Co matrix by high-energy ball milling in a high-purity protective atmosphere, and wrapping the high-energy ball milled alloy powder by using a low-carbon steel ladle and performing hot isostatic pressing at the temperature of between 900 and 1,300 DEG C; and performing solid solution heat treatment (1,000 to 1,300 DEG C) and aging heat treatment (600 to 900 DEG C) on a sample after the hot isostatic pressing to obtain a final nano phase strengthened composite material. The method has the main advantage of solving the problem that the improvement on high-temperature strength is greatly limited because carbide in the traditional cobalt-based alloy is easily roughened or dissolved at a high temperature by simultaneously introducing oxide dispersion strengthening and gamma-phase strengthening into the cobalt-based alloy for the first time.

Description

technical field [0001] The invention belongs to the research field of metal-based composite materials, and particularly provides a method for preparing a novel oxide dispersion-strengthened (ODS) cobalt-based alloy. Background technique [0002] ODS (Oxide Dispersion Strengthening) alloy is an important high-temperature structural material for energy. At present, the research on ODS alloys mainly focuses on ODS ferritic steels and ODS nickel-based superalloys. Research and development in this field has been very active in Japan, Europe and the United States, but China's level in this direction is relatively low. [0003] ODS ferritic steel is related to the construction and safe operation of advanced nuclear energy devices such as fusion reactors, so it has attracted much attention. In fusion reactors, the working environment of the first wall / cladding is very harsh, which requires not only good high temperature creep resistance, but also very good resistance to radiation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C1/05
Inventor 章林曲选辉何新波秦明礼
Owner UNIV OF SCI & TECH BEIJING
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