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Preparation method of powder metallurgy tool and mould steel

A tool steel and tool die technology is applied in the field of powder metallurgy tool and die steel preparation. Process flow, the effect of reducing gas adsorption

Active Publication Date: 2014-04-09
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
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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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Effect test

Embodiment

[0026] The steps for preparing powder metallurgy tool and die steel by adopting the technical scheme of the present invention are:

[0027] (1) The composition and weight percentage of powder metallurgy tool 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: put the master alloy prepared according to the above chemical composition and ratio or weigh the metal element material according to the chemical composition ratio, and put it into the vacuum induction melting crucible of the gas atomization powder making furnace;

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

[0030] (3) Vacuumize the smelting chamber and the atomization chamber; use a mechanical pump and a Roots pump secondary pump system to evacuate the smelting chamber and the atomization chamber of the gas atomization powder making furnace, and the vacuum degree is <20Pa;

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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 method for preparing powder metallurgy tool and die steel, which belongs 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 to have 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 degree of alloying is low, the carbides are coarse, the segregation is serious, the distribution is uneven, and the performance level of wear resistance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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