A method for preparing multiphase strengthened ferritic alloy

A ferrite and alloy technology, applied in the field of metal dispersion strengthening, can solve the problems of high energy consumption of high-energy ball milling, low preparation efficiency, high impurity oxygen content, etc., and achieve the effect of eliminating residual pores

Active Publication Date: 2018-02-09
UNIV OF SCI & TECH BEIJING
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  • Description
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Problems solved by technology

Traditional iron-based oxide dispersion-strengthened alloys are prepared by mechanical alloying process, but long-term high-energy ball milling consumes a lot of energy, easily introduces various metal inclusions, high impurity oxygen content, and low preparation efficiency

Method used

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  • A method for preparing multiphase strengthened ferritic alloy

Examples

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Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: The composition is 5Ni-1Al-3Mn-0.1Y 2 o 3 Preparation of multi-phase strengthened ferritic alloy with oxide disperse phase of -0.3Ti-0.5Cu-balance Fe

[0013] Iron block, Fe-Mn alloy, Ni-Al alloy, Fe-Y alloy, Fe-Ti alloy and copper block are used as raw materials, and the purity of each raw material is greater than 99.9%. Metal raw materials are pretreated in 5vol.% hydrochloric acid aqueous solution to remove surface oxides. The pretreatment time is 5 minutes. After washing with alcohol, dry in an oven at 60°C for 90 minutes. Weigh according to the composition of the target multiphase strengthened ferrite alloy, the composition of the target multiphase strengthened ferrite alloy is: 5Ni-1Al-3Mn-0.1Y 2 o 3 -0.3Ti-0.5Cu-balance Fe. The intermediate alloy is smelted in a vacuum induction furnace. During the smelting process, a CaO ceramic crucible is used to control the vacuum degree of 0.05-0.2Pa. After all the raw materials are melted, the melting power i...

Embodiment 2

[0014] Example 2: The composition is 5Ni-1Al-3Mn-0.2Y 2 o 3 Preparation of multi-phase strengthened ferritic alloy with oxide disperse phase of -0.3Ti-0.5Cu-balance Fe

[0015]Iron block, Fe-Mn alloy, Ni-Al alloy, Fe-Y alloy, Fe-Ti alloy and copper block are used as raw materials, and the purity of each raw material is greater than 99.9%. Metal raw materials are pretreated in 5vol.% hydrochloric acid aqueous solution to remove surface oxides. The pretreatment time is 10 minutes. After washing with alcohol, dry in an oven at 70°C for 60 minutes. Weigh according to the composition of the target multiphase strengthened ferrite alloy, the composition of the target multiphase strengthened ferrite alloy is: 5Ni-1Al-3Mn-0.2Y 2 o 3 -0.3Ti-0.5Cu-balance Fe. The intermediate alloy is smelted in a vacuum induction furnace. During the smelting process, a CaO ceramic crucible is used to control the vacuum degree of 0.05-0.2Pa. After all the raw materials are melted, the melting power i...

Embodiment 3

[0016] Example 3: The composition is 5Ni-1Al-3Mn-0.25Y 2 o 3 Preparation of multi-phase strengthened ferritic alloy with oxide disperse phase of -0.3Ti-0.5Cu-balance Fe

[0017] Iron block, Fe-Mn alloy, Ni-Al alloy, Fe-Y alloy, Fe-Ti alloy and copper block are used as raw materials, and the purity of each raw material is greater than 99.9%. Metal raw materials are pretreated in 5vol.% hydrochloric acid aqueous solution to remove surface oxides. The pretreatment time is 15 minutes. After washing with alcohol, dry in an oven at 75°C for 45 minutes. Weigh according to the composition of the target multiphase strengthened ferrite alloy, the composition of the target multiphase strengthened ferrite alloy is: 5Ni-1Al-3Mn-0.25Y 2 o 3 -0.3Ti-0.5Cu-balance Fe. The intermediate alloy is smelted in a vacuum induction furnace. During the smelting process, a CaO ceramic crucible is used to control the vacuum degree of 0.05-0.2Pa. After all the raw materials are melted, the melting powe...

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Abstract

The invention relates to a method for preparing multi-phase reinforced ferrite alloy and belongs to the technical field of metal dispersion strengthening. A technological process is that firstly, an alloy ingot is purified by adopting a vacuum melting+electroslag remelting double process; spray forming is performed on the purified alloy ingot, mixed gas of inert high pressure gas and oxygen is taken as an atomizing medium, the content of introduced oxygen is controlled through adjusting oxygen partial pressure in the atomizing medium, and an oxygen element is provided for the formation of oxides in the alloy; an alloy blank is thermally extruded, oxidization films on the surfaces of powder particles are crushed in the thermal extrusion process and are distributed again, and the oxygen element is preferentially combined with rare earth elements Y and Ti to form a Y-O or Y-Ti-O oxide dispersion phase. The obtained ferrite alloy is jointly strengthened by an L21 type Ni2AlMn inter-metallic compound, a NiAl inter-metallic compound, a Cu-rich precipitate and the oxide dispersion phase. The method provided by the invention solves the problems of low efficiency and high content of metal and nonmetallic inclusions when a traditional mechanical alloying process is used for preparing a dispersion-strengthened material, so that the comprehensive mechanical properties of the material are improved.

Description

technical field [0001] The invention belongs to the technical field of metal dispersion strengthening, and in particular provides a method for preparing a multi-phase strengthened ferrite alloy by adopting a process combining semi-solid forming and hot extrusion. Background technique [0002] Ferritic alloys strengthened by intermetallic compounds, Cu-rich precipitates and nano-oxides have a two-phase structure similar to nickel-based alloys γ / γ', which is expected to improve the service temperature limit and high temperature of traditional ferritic heat-resistant alloys. Mechanical properties have important application prospects in the field of high-temperature structural materials. Nano-oxide particles have excellent thermal and chemical stability. At a temperature close to the melting point of the alloy, nano-oxides can still hinder the movement of dislocations. It is the most important strengthening phase in oxide dispersion strengthened alloys. . The (Ni,Fe)Al interme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/08C22C38/06C22C38/04C22C38/14C22C38/16C22C33/06C22C33/02C21D1/18
CPCC21D1/18C21D2211/004C21D2211/005C22C33/0264C22C33/06C22C38/005C22C38/04C22C38/06C22C38/08C22C38/14C22C38/16
Inventor 章林刘烨王道宽单化杰陈晓玮曲选辉
Owner UNIV OF SCI & TECH BEIJING
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