Nano-cluster-strengthened iron-base superalloy

An iron-based superalloy and nano-cluster technology, applied in the field of metal materials, can solve the problems of difficulty in controlling oxygen content, reducing bonding strength, and low density of molded green bodies at room temperature, so as to reduce the mechanical alloying process and high-temperature sintering process , Precise control of oxygen content, uniform distribution of solid dissolved oxygen

Inactive Publication Date: 2011-07-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the inherent limitations of the grinding process of the MA preparation process, this method has the following disadvantages: (1) The introduction of impurities: during the mechanical alloying grinding process, solid impurities are introduced due to the long-term interaction between the alloy raw materials, grinding balls and grinding barrels , pollute the powder and reduce the mechanical properties of the alloy; (2) difficult to control the oxygen content: the oxygen content is controlled by the oxygen content of the raw material powder and the MA process
This method has a simple preparation process, but it is difficult to prepare high-performance nanocluster-strengthened iron-based alloys. The main disadvantages are as follows: (1) Due to the high degree of powder alloying and difficult deformation, the molded bod

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: A nanophase-strengthened iron-based superalloy whose composition is Fe-13.8Cr-3.1W-0.42Ti-0.27Y-0.08O (mass fraction%)

[0049] Select the gas-atomized Fe-13.8Cr-3.1W-0.42Ti-0.27Y-0.08O (mass fraction %) alloy powder with a particle size of ≤200 μm and an average oxygen content of 0.08% (mass fraction), and put it into the steel ladle , use a vacuum unit to vacuum degas the bag filled with powder, and the vacuum degree reaches 10 -2 Pa and continue to evacuate for more than 30min, then heat the enveloped powder to 150°C and continue to evacuate to 10 -2 After Pa, degassing for more than 60min, heat locally and rapidly at the part 40mm~60mm above the bottom of the exhaust pipe of the sheath, and hammer it quickly after heating to the temperature that can be completely welded by hammering, repeating several times to completely weld the inner wall of the exhaust pipe Close, remove the excess exhaust pipe, and use a welding machine to weld the exhaust pipe seal....

Embodiment 2

[0051] Example 2: A nanophase-strengthened iron-based superalloy whose composition is Fe-13.9Cr-2.6W-0.38Ti-0.32Y-0.11O (mass fraction%)

[0052]Select the gas atomized Fe-13.9Cr-2.6W-0.38Ti-0.32Y-0.11O (mass fraction %) iron-based alloy powder whose particle size is ≤200 μm and average oxygen content of 0.11% (mass fraction), and then according to the example The method and steps of 1 complete the sealing and welding of the sheathing powder, heating and heat preservation, smearing of graphite powder, and then extruding with an extrusion ratio of 9:1. After removing the sheathing, the resulting material has a density of 7.77×10 3 kg / m 3 , the relative density reaches more than 99%. After subsequent deformation and heat treatment, a nanocluster-strengthened iron-based superalloy is obtained.

Embodiment 3

[0053] Example 3: A nanophase-strengthened iron-based superalloy whose composition is Fe-14.5Cr-2.9W-0.45Ti-0.40Y-0.15 (mass fraction%)

[0054] Select the gas atomization Fe-14.5Cr-2.9W-0.45Ti-0.40Y-0.15O (mass fraction %) iron-based alloy powder whose particle size is ≤200 μm and average oxygen content of 0.2% (mass fraction), and then according to the example The method and steps of 1 complete the sealing and welding of the sheathing powder, heating and heat preservation, applying graphite powder, and then extruding with an extrusion ratio of 14:1. After removing the sheathing, the resulting material has a density of 7.78×10 3 kg / m 3 , the relative density reaches more than 99%. After subsequent deformation and heat treatment, a nanocluster-strengthened iron-based superalloy is obtained.

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Abstract

The invention relates to nano-cluster-strengthened iron-base superalloy, which comprises the following components: Fe-(13-15)Cr-(2.5-3.5)W-(0.35-0.6)Ti-(0.2-0.6)Y-(0.05-0.20)O, wherein Y and O are used as alloy elements, O is introduced into the alloy as an alloy element, O element and pure metal Y replace Y2O3 particles added directly to serve as reinforced mass point, gas-atomized alloy powder replaces mechanically-alloyed powder so as to more accurately control oxygen content, and the alloys in different batches have uniform performance and good repeatability. The final product can be effectively controlled to form nano clusters or nano oxides in dispersed distribution; and the produced alloy has high purity and no alloy pollution problem caused by mechanically-alloyed powder; and the oxide is finer and disperses evenly. The production method provided by the invention has simple process, high production efficiency and low cost, can be used for preparing large size material, and is favorable for large-scale production and application.

Description

technical field [0001] The invention relates to a nano-cluster reinforced iron-based superalloy. It belongs to the field of metal materials. Background technique [0002] Oxide dispersion strengthened (ODS) alloy is an alloy (called ODS alloy) that uses ultrafine oxides with high thermal and chemical stability to strengthen the alloy matrix. It has both dispersion strengthening and precipitation strengthening. A strengthening mechanism, with excellent high-temperature mechanical properties and oxidation resistance, is a class of high-performance powder metallurgy superalloys. At present, the preparation of oxide dispersion strengthened alloy is mainly obtained by mechanical alloying (MA) method to uniformly disperse ultrafine oxide particles into the alloy powder matrix, and then obtain it after consolidation forming and subsequent treatment. [0003] Recently, in the study of mechanically alloyed oxide dispersion strengthened alloys (MA / ODS), it was found that the compreh...

Claims

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Application Information

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IPC IPC(8): C22C38/28C22C33/02C21D8/00
Inventor 刘祖铭刘咏贺跃辉黄伯云刘志坚梁叔全陈仕奇雷霆刘锋刘东华张刘杰张宁一韩云娟温玉仁赵大鹏郭薇
Owner CENT SOUTH UNIV
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