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High-chromium martensite cast iron heat treatment method based on natural aging

A heat treatment method and natural aging technology, applied in the field of high chromium cast iron, can solve the problems of high heat treatment process cost, complex heat treatment process and high heat treatment temperature, and achieve the effects of environmental friendliness, simple heat treatment method and high hardness

Active Publication Date: 2020-12-25
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition contains precious alloying elements Ni, Mo, V, Nb, high cost, complex process and high cost
[0010] In summary, the existing high-chromium cast iron has technical defects of high production cost, complex heat treatment process, high heat treatment temperature and high heat treatment process cost, and the hardness and toughness of the product after heat treatment need to be improved

Method used

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  • High-chromium martensite cast iron heat treatment method based on natural aging
  • High-chromium martensite cast iron heat treatment method based on natural aging
  • High-chromium martensite cast iron heat treatment method based on natural aging

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Effect test

Embodiment 1

[0035] A heat treatment method for high chromium martensitic cast iron based on natural aging. The chemical composition and mass percentage of the high chromium martensitic cast iron are: C is 2.8%, Cr is 18.2%, Si is 0.5%, Mn is 2.0%, Cu is 0.7%, P≤0.49%, S≤ 0.49%, wherein Cr / C=18.2 / 2.8=6.5, and the balance is Fe. Batching, smelting, pouring and grinding according to the above chemical composition and its mass percentage content, after grinding, heat preservation at 900°C for 1 hour, then water quenching to room temperature, and natural aging at room temperature for 7 days to obtain high chromium horse Tensitic cast iron. The matrix structure of the high chromium martensitic cast iron is martensite.

[0036] The high chromium martensitic cast iron obtained in the two stages of the heat treatment of this embodiment is detected respectively: the hardness of the high chromium martensitic cast iron before natural aging is 61.4HRC, and the V-notch impact energy is 2.0J; the high c...

Embodiment 2

[0038] A heat treatment method for high chromium martensitic cast iron based on natural aging. The chemical composition and mass percentage of the high chromium martensitic cast iron are: C is 2.5%, Cr is 18%, Si is 0.6%, Mn is 2.3%, Cu is 0.8%, P≤0.05%, S≤ 0.05%, where Cr / C=18 / 2.5=7.2, and the balance is Fe. Batching, smelting, pouring and grinding according to the above chemical composition and its mass percentage content, after grinding, heat preservation at 950°C for 1 hour, then water quenching to room temperature, and natural aging at room temperature for 15 days to obtain high chromium horse Tensitic cast iron. The matrix structure of the high chromium martensitic cast iron is martensite.

[0039] The high-chromium martensitic cast irons obtained in the two stages of heat treatment in this embodiment were detected respectively: the hardness of the high-chromium martensitic cast irons before natural aging was 62.5HRC, and the V-notch impact energy was 1.8J; the high-ch...

Embodiment 3

[0041] A heat treatment method for high chromium martensitic cast iron based on natural aging. The mass percentages of the chemical components of the high chromium martensitic cast iron are: C is 2.9%, Cr is 20%, Si is 0.9%, Mn is 2.5%, Cu is 1.0%, P≤0.05%, S≤0.05 %, where Cr / C=20 / 2.9=6.9, and the balance is Fe. Batching, smelting, pouring and grinding according to chemical composition and mass percentage; after grinding, heat preservation at 950°C for 1.5 hours, and natural aging at room temperature for 18 days to obtain high-chromium martensitic cast iron. The matrix structure of the high chromium martensitic cast iron is martensite.

[0042] The high chromium martensitic cast irons obtained in the two stages of heat treatment in this embodiment were detected respectively: the hardness of the high chromium martensitic cast irons before natural aging was 61.9HRC, and the V-notch impact energy was 1.7J; the high chromium martensitic cast irons after natural aging The hardnes...

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Abstract

The invention relates to a high-chromium martensite cast iron heat treatment method based on natural aging. According to the technical scheme, high-chromium martensite cast iron comprises the following chemical components in percentage by mass: 2.5-3.0% of C, 18-22% of Cr, 0.5-0.9% of Si, 2.0-2.5% of Mn, 0.7-1.2% of Cu, less than or equal to 0.049% of P, less than or equal to 0.049% of S, and thebalance of Fe, wherein 6.5 <=Cr / C<=7.3. The preparation method comprises the following steps: proportioning the chemical components, performing smelting, pouring and polishing, keeping the temperatureat 900-1000 DEG C for 1-2 hours after polishing, then carrying out water quenching until room temperature is reached, and performing natural aging at room temperature for 7-21 days to prepare the high-chromium martensite cast iron. The hardness of the high-chromium martensite cast iron ranges from 65.5 HRC to 67.5 HRC, the V notch impact work ranges from 2.4 J to 5.2 J, and the matrix structure is martensite. The method has the advantages of simple heat treatment process, low heat treatment cost and energy conservation, and the high-chromium martensite cast iron prepared after natural aging is high in hardness and good in toughness.

Description

technical field [0001] The invention belongs to the technical field of high chromium cast iron. In particular, it relates to a heat treatment method for high-chromium martensitic cast iron based on natural aging. Background technique [0002] High chromium cast iron refers to the cast iron in which the carbon in the alloy mainly exists in the form of carbides and has high hardness and high wear resistance. With the development of science and technology and society, in order to further improve the hardness, wear resistance and toughness of high chromium cast iron to adapt to the development of industrial technology, a lot of research and technical development have been carried out by those skilled in the art. The as-cast structure of high chromium cast iron consists of austenite + eutectic carbide M 7 C 3 Composition, during the quenching process, the transformation from austenite to martensite will occur, accompanied by the precipitation of secondary carbides. Generally, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D5/00C22C37/10C22C37/06
CPCC21D5/00C22C37/10C22C37/06
Inventor 吴开明郑欢
Owner WUHAN UNIV OF SCI & TECH
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