Nano-cluster-strengthened iron-base superalloy

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...

AI Technical Summary

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 body at room temperature has low density and poor porosity. At the same time, long-term high-temperature sintering oxidizes the powder surface. These factors hinder the bonding of the powder interface and reduce the bonding strength, thereby reducing the mechanical properties of the alloy; The film is not easily damaged, and the residual oxide film is easy to form the original particle boundary, which reduces the strength of the material; (3) the solid dissolved oxygen in the powder forms a stable oxide during the long-term high-temperature sintering (1350°C / 2h) stage of the compacted body, and loses Conditions for forming nanoclusters

In particular, the sintered pores of the green body are difficult to eliminate through forging with a small amount of deformation, and the performance of the prepared iron-based alloy is low.

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