High-carbon high-alloy steel product and preparation method thereof

A high-alloy steel, high-carbon technology, applied in the field of ferrous metal preparation, can solve the problems of shortening service life and safety, cracking, carbide and matrix damage, etc., reducing local solidification time, accelerating cooling rate, and long solidification time. Effect

Active Publication Date: 2022-03-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the existence of a large number of large carbides, it often leads to damage or even cracking between the carbides and the matrix during the conventional deformation process. These hole-type micro-defects will become the source of fatigue during the service of the parts and greatly shorten the service life. and security

Method used

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  • High-carbon high-alloy steel product and preparation method thereof
  • High-carbon high-alloy steel product and preparation method thereof
  • High-carbon high-alloy steel product and preparation method thereof

Examples

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preparation example Construction

[0041] On the one hand, an embodiment of the present invention provides a method for preparing a high-carbon high-alloy steel product, comprising the following steps:

[0042]1) Preparation of high-carbon and high-alloy steel low-segregation double-vacuum self-consumption blanks: adopt vacuum melting and vacuum self-consumption dual-vacuum smelting methods to manufacture high-carbon high-alloy steel blanks, and obtain low-segregation ratio casting blanks by controlling solidification parameters. The fluctuation of carbon mass fraction is controlled within ±0.02%.

[0043] Preferably, the consumable process adopts a high-carbon and high-alloy consumable billet of less than 6 tons, and controls the average molten pool depth-to-width ratio of the mushy zone of the consumable billet to be between 0.4-0.8, wherein the mushy zone has a solid fraction of 0.1-0.9 interval. Since the self-consumption process includes arc initiation, arc stabilization and arc extinguishing stages, the ...

Embodiment 1

[0059] This embodiment prepares a high-carbon high-alloy steel pipe, and the specific preparation steps are as follows:

[0060] 1) Preparation of high-carbon and high-alloy steel low-segregation double-vacuum consumable billets: double-vacuum is used to prepare as-cast billets. The ingot material is M50 steel, and the consumable ingot is 6t. By controlling the average molten pool depth-width ratio in the mushy zone to 0.4, Control the carbon content fluctuation within ±0.02%, the carbide size at the 1 / 2 radius of the riser end is less than 374μm, and the hole defect size is less than 32μm;

[0061] 2) Billet high-temperature diffusion homogenization treatment and multi-fire cross-forging deformation billet opening treatment: In order to make the structure uniform, the billet is kept at a high temperature of 1130 ° C for 30 hours before forging, so that the distribution of components between dendrites is more uniform; During the forging process, the three-upsetting and three-d...

Embodiment 2

[0065] This embodiment prepares a high-carbon high-alloy steel bar, and the specific preparation steps are as follows:

[0066] 1) Preparation of high-carbon and high-alloy steel low-segregation double-vacuum consumable billets: double-vacuum was used to prepare as-cast billets, the steel ingot material was M50 steel, and the consumable ingot was 2t. By controlling the average molten pool depth-to-width ratio in the mushy zone to 0.6, the The carbon content fluctuation is controlled within ±0.02%, the carbide size at the 1 / 2 radius of the riser end is less than 294μm, and the hole defect size is less than 24μm;

[0067] 2) Billet high-temperature diffusion homogenization treatment and multi-fire cross-forging deformation billet opening treatment: In order to make the structure uniform, the billet is kept at a high temperature of 1230°C before forging, and the holding time needs to be 20h to make the composition distribution between dendrites more uniform; In the forging proces...

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Abstract

The invention relates to a high-carbon high-alloy steel product and a preparation method thereof, and mainly adopts the technical scheme that the preparation method of the high-carbon high-alloy steel product comprises the following steps: 1) preparing a high-carbon high-alloy steel low-segregation double-vacuum consumable blank; the preparation method is mainly used for preparing a high-carbon high-alloy steel product with fine carbides evenly distributed and hole type microdefects eliminated, and the high-carbon high-alloy steel product is prepared through the method and comprises the steps of (1) forging, (2) blank high-temperature diffusion homogenization treatment and multi-heating-number cross forging deformation cogging treatment, and (3) forging and (4) hot deformation extrusion treatment on the forged material.The preparation method is mainly used for preparing the high-carbon high-alloy steel product.

Description

technical field [0001] The invention relates to the technical field of ferrous metal preparation, in particular to a high-carbon high-alloy steel product and a preparation method thereof. Background technique [0002] High-carbon high-alloy steels such as M50 and 9Cr18Mo are widely used in aerospace, tooling and other fields due to their good high temperature stability and wear resistance. In order to meet the high-speed, high-temperature, high-load harsh working conditions and high fatigue life service performance requirements, it is necessary to adopt the vacuum induction + vacuum self-consumption melting method, that is, the double vacuum preparation method, and then adopt the traditional forging and / or ring rolling hot deformation method. into rods and / or rings. [0003] Due to the high carbon content and alloy content of these steels, during the solidification process, large-scale liquid precipitation carbides often appear due to severe dendrite segregation, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04B21J5/00C21D7/13C22B9/04
CPCC22C33/04C22B9/04C21D7/13B21J5/002Y02P10/25
Inventor 曹艳飞刘宏伟李殿中孙明月徐斌傅排先类承帅赵志坡武玉喜李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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