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Preparation method of powder metallurgy tool and mould steel

A technology for tool and die steel and tool die, applied in the field of powder metallurgy tool and die steel preparation, can solve the problems of a large number of non-metallic inclusions, unstable performance, process obstacles, etc., to reduce the generation of hollow powder, strong interaction, The effect of increasing the degree of fragmentation

Active Publication Date: 2013-02-06
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

my country's powder metallurgy tool and die steel has not been able to make a breakthrough, mainly because there are obstacles in the process, mainly because the tool and die steel prepared by the existing process has a high gas content, a large number of non-metallic inclusions, a large size, and poor performance. Stablize

Method used

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Embodiment

[0026] The steps of preparing powder metallurgy tool and die steel using the technical solution of the present invention are:

[0027] (1) The composition and weight percentage of powder metallurgy tool and die steel are: C: 2.30%, Cr: 4.00%, Co: 10.60%, Mo: 7.00%, V: 6.60%, W: 6.50%, and the balance is Fe;

[0028] (2) Charging: The master alloy prepared according to the above chemical composition and proportioning or the metal element material according to the chemical composition proportioning is weighed, and loaded into the vacuum induction melting crucible of the gas atomizing powder making furnace;

[0029] The vacuum induction melting crucible is prepared by isostatic pressing of magnesium-aluminum spinel;

[0030] (3) Vacuum the smelting chamber and atomizing chamber; use the mechanical pump and the secondary pump system of the Roots pump to vacuum the smelting chamber and atomizing chamber of the gas atomizing pulverizing furnace, and the vacuum degree is less than 20...

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Abstract

The invention discloses a preparation method of powder metallurgy tool and mould steel. The preparation method combines the advantages of vacuum induction melting, inert gas atomized powdering process and powder metallurgy technology, and comprises the steps of utilizing gas atomized powdering equipment to melt tool and mould steel, preparing high-quality tool and mould steel powder with little porosity powder, little nonmetal inclusion and a small size through an optimally designed negative pressure powdering process, and preparing high-quality powder metallurgy tool and mould steel ingot through further thermal dynamic degassing, sheathing and hot isostatic pressing.

Description

technical field [0001] The invention relates to a preparation method of powder metallurgy tool and die steel, belonging to the technical field of powder metallurgy tool and die steel preparation. Background technique [0002] my country's automobile, aviation, aerospace and equipment manufacturing industries are in a stage of rapid development, and are gradually transforming from a manufacturing power to a manufacturing power. Advanced aviation, aerospace and automotive products require parts with better performance, lower cost and higher environmental protection, while processing technology requires faster processing speed, higher reliability, and high repeatability. The existing tool and die materials in my country are mainly based on the melting and forging process. Due to the limitation of the melting process, the alloying degree is low, the carbides are coarse, the segregation is serious, the distribution is uneven, and the performance levels such as wear resistance, im...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 袁华李周张国庆许文勇高正江刘娜
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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