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Preparation method and application of a high-strength and high-toughness iron-nickel-chromium-based heat-resistant alloy

A heat-resistant alloy and high-toughness iron technology, which is applied in the field of heat-resistant alloy materials, can solve problems such as poor economy, high alloy hardness, and difficult deformation, and achieve excellent plasticity and impact properties, improved alloy performance, and good hot workability. Effect

Active Publication Date: 2021-08-24
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, the materials that meet this harsh condition can only be solid-solution-strengthened deformable heat-resistant alloys. Of the more than 160 heat-resistant alloys included in the "China Superalloy Handbook", only 22 are solid-solution-strengthened deformable alloys; Among these alloys, there are 18 alloys based on Ni or Co, containing relatively high Cr+W+Mo elements (≥25wt.%), which are poor in economy and unfavorable for the commercialization of fast reactors in the future; moreover, these The alloy has high hardness, is difficult to deform, and is prone to precipitate harmful TCP phases such as σ, μ, or Laves, which seriously damages the structure or performance stability of the alloy during long-term service, and further threatens the reliability and safety of the entire nuclear power system; other 4 This alloy is based on iron-nickel-chromium, but it cannot be used to make a new type of nuclear power plant pipe fittings due to insufficient strength and plasticity, or insufficient stability in structure and performance; therefore, it is of great significance to develop new alloys

Method used

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  • Preparation method and application of a high-strength and high-toughness iron-nickel-chromium-based heat-resistant alloy
  • Preparation method and application of a high-strength and high-toughness iron-nickel-chromium-based heat-resistant alloy
  • Preparation method and application of a high-strength and high-toughness iron-nickel-chromium-based heat-resistant alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The composition of the high-strength and high-toughness iron-nickel-chromium-based heat-resistant alloy contains C 0.052%, Cr 15.5%, Mo 3.3%, Mn 1.5%, B 0.0015%, Ni 36%, and the balance is Fe;

[0064] The method is:

[0065] Use pyrolytic graphite, metallic iron, metallic chromium, metallic nickel, metallic molybdenum, nickel boron alloy and metallic manganese as raw materials;

[0066] Vacuum smelt the raw materials according to the above composition, the vacuum degree is 0.5Pa, and then cast them into ingots;

[0067] The ingot is forged at 1130°C to make a bar, the forging ratio is 8.5, and the metallographic structure is as follows figure 1 As shown, the average grain size is 5.6;

[0068] The forged bar was calendered and rolled at 1130°C for a total of 8 passes. The diameter ratio of the rolled bar to the forged bar was 1:4.5. The metallographic structure of the rolled bar is shown in figure 2 As shown, the average grain size is 12.4;

[0069] The rolled bar...

Embodiment 2

[0072] The composition of the high-strength and high-toughness iron-nickel-chromium-based heat-resistant alloy contains C 0.052%, Cr 15.5%, Mo 3.2%, Mn 1.5%, Ni 35.4%, and the balance is Fe;

[0073] Method is with embodiment 1, and difference is:

[0074] (1) Using pyrolytic graphite, metal iron, metal chromium, metal nickel, metal molybdenum and metal manganese as raw materials;

[0075] (2) Forging the ingot at 1000°C to make a bar, the forging ratio is 8.5, and the average grain size is 7.9;

[0076] (3) The forged bar is calendered and rolled at 1100°C, and the calendered rolling is carried out for 6 passes, and the diameter ratio of the rolled bar to the forged bar is 1:4; the average grain size of the rolled bar is 12.6;

[0077] (4) The rolled bar is heat-treated at 1100°C for 30 minutes; the average grain size of the high-strength and high-toughness iron-nickel-chromium-based heat-resistant alloy is 4.4;

[0078] The high-strength and high-toughness iron-nickel-chro...

Embodiment 3

[0080] The composition of the high-strength and high-toughness iron-nickel-chromium-based heat-resistant alloy contains C 0.052%, Cr 15.5%, Mo3.1%, Mn 1.4%, Nb 0.25%, B 0.0015%, Zr 0.006%, Ni 35.4%, and more than The amount is Fe;

[0081] Method is with embodiment 1, and difference is:

[0082] (1) Using pyrolytic graphite, metal iron, metal chromium, metal nickel, metal niobium, metal zirconium, nickel-boron alloy, metal molybdenum and metal manganese as raw materials;

[0083] (2) Forging the ingot at 1180°C to make a bar, the forging ratio is 9, and the average grain size is 4.5;

[0084] (3) The forged bar is calendered and rolled at 1000°C, and the calendered rolling is carried out for 5 passes, and the diameter ratio of the rolled bar to the forged bar is 1:5; the average grain size of the rolled bar is 14 grades;

[0085] (4) The rolled bar is heat-treated at 1090°C for 40 minutes; the average grain size of the high-strength and high-toughness iron-nickel-chromium-ba...

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Abstract

A preparation method and application of a high-strength and high-toughness iron-nickel-chromium-based heat-resistant alloy, the components contain C 0.03-0.1%, Cr 14-17%, Mo 3-4%, Mn 1-2%, W 0- 0.5%, Nb 0~1%, N 0~0.03%, B 0~0.002%, Zr 0~0.05%, Ni 35~38%, Y 0~0.05%, the balance is Fe; the method is: (1) Using pyrolytic graphite, metal iron, metal chromium, metal nickel, metal molybdenum, metal manganese, metal tungsten, metal niobium, metal zirconium, nickel-boron alloy, aluminum-yttrium alloy, chromium nitride as raw materials; (2) vacuum smelting the raw materials , cast into ingots; (3) forged at 1000 ~ 1180 ° C to make rods, forging ratio 8 ~ 9; (4) forged bars are rolled at 1000 ~ 1180 ° C; (5) Rolled bars Heat treatment is performed at 1040-1100 degreeC. The product of the present invention has high strength, excellent plasticity and impact properties, and can be used for a long time under the condition of not higher than 750°C.

Description

technical field [0001] The invention belongs to the technical field of heat-resistant alloy materials, and in particular relates to a high-strength and high-toughness iron-nickel-chromium-based heat-resistant alloy and a preparation method thereof. Background technique [0002] The development of nuclear power in the world can be divided into four generations, which are prototype reactor power plants, large commercial nuclear power plants, advanced light water reactor nuclear power plants (such as AP1000, EPR, etc.) reactor, sodium-cooled fast reactor, etc.); sodium-cooled fast reactor is the preferred reactor type for the fourth-generation advanced nuclear energy system. It has extremely high safety, can significantly improve the utilization rate of uranium and greatly reduce nuclear waste. [0003] Safety is the lifeline of nuclear power; the safety of nuclear power plants is not only a problem in the operation stage, but also exists in the design and construction stages o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/03B21C37/04C22F1/00
CPCB21C37/045C21D8/065C22C1/03C22C30/00C22C33/06C22C38/001C22C38/005C22C38/04C22C38/44C22C38/48C22C38/50C22C38/54C22C38/58C22F1/00
Inventor 秦学智吴云胜郭永安王常帅侯介山周兰章
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI