Preparation method of powder metallurgy tool and mould steel

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...