Preparation method of enhanced type Fe-Ni-Co-based high temperature alloy through precipitation

A superalloy and precipitation strengthening technology is applied in the field of preparation of precipitation-strengthened iron-nickel-cobalt-based superalloys, which can solve the problems of uneven mechanical properties, expensive powder sintering equipment for powder sintering, serious alloy segregation, etc. The effect of low cost, low cost of powder sintering, and simple strengthening phase

Inactive Publication Date: 2015-05-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The development of powder superalloys can well solve the problems of severe alloy segregation and uneven mechanical properties in the traditional ingot casting process.
Our country has successfully developed these three types of powder superalloy pre-alloyed powders, all of which are made by plasma rotating electrode technology, hot isostatic pressing sintered bulk materials, powder making equipment and powder sintering equipment are relatively expensive

Method used

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  • Preparation method of enhanced type Fe-Ni-Co-based high temperature alloy through precipitation
  • Preparation method of enhanced type Fe-Ni-Co-based high temperature alloy through precipitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing a precipitation-strengthened iron-nickel-cobalt-based superalloy, comprising the following steps:

[0023] 1) In terms of mass fraction, pure element powder with a purity ≥ 99.5% is used as a raw material, including 0.4% carbon, 17.0% chromium, 2.0% tungsten, 4.0% niobium, 21.5% nickel, 22.5% cobalt, 10.5% molybdenum, the balance being iron;

[0024] 2) Under an inert atmosphere, place the raw materials in the tank of a high-energy vibrating rod mill, and perform a rod milling process using a mechanical alloying process to obtain a pre-alloyed powder mixed with supersaturated nanocrystalline and amorphous;

[0025] 3) Place the pre-alloyed powder in a stainless steel sheath for vacuum sealing;

[0026] 4) After sealing and welding, place the stainless steel sheath in a hot-pressing sintering furnace (ZT-15-10Y series vacuum hot-pressing sintering furnace produced by Shanghai Chenhua Electric Furnace Co., Ltd.) for hot-pressing sintering. The sint...

Embodiment 2

[0029] A method for preparing a precipitation-strengthened iron-nickel-cobalt-based superalloy, comprising the following steps:

[0030] 1) In terms of mass fraction, pure element powder with a purity ≥ 99.5% is used as a raw material, including 0.5% carbon, 18.0% chromium, 2.3% tungsten, 4.5% niobium, 22% nickel, 24% cobalt, 11.5% molybdenum, the balance being iron;

[0031] 2) Under an inert atmosphere, place the raw materials in the tank of a high-energy vibrating rod mill, and perform rod milling using a mechanical alloying process to obtain supersaturated nanocrystalline and amorphous mixed pre-alloyed powders;

[0032] 3) Place the pre-alloyed powder in a stainless steel sheath for vacuum sealing;

[0033] 4) After sealing and welding, place the stainless steel sheath in a hot-press sintering furnace for hot-press sintering, the sintering temperature is 1060°C, and the sintering time is 120min; the sintering system is: pressurize no more than 3Mpa before 900°C, Pressur...

Embodiment 3

[0036] A method for preparing a precipitation-strengthened iron-nickel-cobalt-based superalloy, comprising the following steps:

[0037] 1) In terms of mass fraction, pure element powder with a purity ≥ 99.5% is used as a raw material, including 0.5% carbon, 19.50% chromium, 3.0% tungsten, 5.0% niobium, 23.5% nickel, 25.5% cobalt, 12.5% ​​molybdenum, the balance being iron;

[0038] 2) Under an inert atmosphere, place the raw materials in the tank of a high-energy vibrating rod mill, and perform rod milling using a mechanical alloying process to obtain supersaturated nanocrystalline and amorphous mixed pre-alloyed powders;

[0039] 3) Place the pre-alloyed powder in a stainless steel sheath for vacuum sealing;

[0040] 4) After sealing and welding, place the stainless steel sheath in a hot-press sintering furnace for hot-press sintering, the sintering temperature is 1080°C, and the sintering time is 100min; the sintering system is: pressurize no more than 3Mpa before 900°C, ...

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Abstract

The invention discloses a preparation method of an enhanced type Fe-Ni-Co-based high temperature alloy through precipitation and belongs to the technical field of alloy material preparation. The preparation method of the enhanced type Fe-Ni-Co-based high temperature alloy through precipitation comprises the following steps: firstly selecting pure element powder as a raw material, preparing supersaturated nanocrystalline and non-crystal mixed pre-alloyed powder by adopting a mechanical alloying technique, then putting the pre-alloyed powder into a stainless steel sheath, carrying out vacuum seal welding, then carrying out hot pressed sintering on the stainless steel sheath after vacuum seal welding is finished, and finally cooling a sintered sample, releasing pressure and breaking vacuum, so that the enhanced type Fe-Ni-Co-based high temperature alloy is obtained through precipitation. The preparation method of the enhanced type Fe-Ni-Co-based high temperature alloy through precipitation has the advantages that the stainless steel sheath is adopted for carrying out hot pressed sintering, the traditional female mould is not used any longer, and a large part can be conveniently sintered, powder flowability during sintering is improved, powder can be purified, and bulk alloy with large volume and high compactness can be prepared on the basis; and meanwhile, the preparation method of the enhanced type Fe-Ni-Co-based high temperature alloy through precipitation is easy to operate, and requirement on equipment is low.

Description

technical field [0001] The invention belongs to the technical field of alloy material preparation, and in particular relates to a preparation method of a precipitation-strengthened iron-nickel-cobalt-based superalloy. Background technique [0002] Superalloys are highly alloyed iron-, nickel-, or cobalt-based austenitic metal materials. Superalloy materials have excellent properties that cannot be replaced by other materials. It not only has good high-temperature strength and anti-oxidation corrosion performance, but also has excellent anti-fatigue and anti-creep properties in service in complex environments, and has a small tendency of tissue stability and fracture. It is closely related to the national economy and plays an increasingly important role in modern national defense construction and national industry development. increasingly important role. [0003] There are about 200 superalloy grades developed in my country, including 62 equiaxed nickel-based alloys, 15 di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C30/00
Inventor 席生岐孙崇锋党晓凤郑良栋
Owner XI AN JIAOTONG UNIV
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