Heat treatment process for powder metallurgical high-speed steel

Abstract

The invention discloses a heat treatment process for powder metallurgical high-speed steel. The heat treatment process comprises the following steps: A, carrying out annealing treatment, heating the powder metallurgical high-speed steel to 850 DEG C, then carrying out heat preservation, cooling to 750 DEG C along with a furnace, carrying out heat preservation again for 3 h, then cooling to 500 DEG C along with the furnace, and discharging out of the furnace; B, carrying out quenching treatment with the quenching temperature of 1230-1260 DEG C and the austenitizing heat preservation time of 12-15 s/mm; and C, carrying out tempering treatment, tempering for 3-4 times with the tempering temperature of 540 DEG C. The invention discloses the heat treatment process for the powder metallurgical high-speed steel; in the quenching process, the quenching process requirements are ensured, and the impact toughness of the material is enhanced; and three times of tempering treatment are carried out, so that tempering is allowed to be more full.

Description

technical field [0001] The invention relates to a heat treatment process for powder metallurgy high-speed steel. Background technique [0002] High-speed steel is widely used in the tool manufacturing industry and is one of the important tool materials. However, traditional smelting, ingot casting, forging and other production processes are prone to carbide segregation. The primary carbide size is 2-12 μm, and it is produced by powder metallurgy. The average size of primary carbides in high-speed steel is 2 μm, and the maximum is 5 μm, which fundamentally solves the problem of coarse and uneven distribution of high-speed steel carbides. What is particularly striking is that the powder metallurgy method can produce ordinary casting and forging methods that are difficult or difficult to produce. High-speed steel with high alloy content and high nitrogen content cannot be produced. Therefore, since high-speed steel chips are hot-pressed into powder metallurgy high-speed steel, ...

AI Technical Summary

Problems solved by technology

[0002] High-speed steel is widely used in the tool manufacturing industry and is one of the important tool materials. However, traditional smelting, ingot casting, forging and other production processes are prone to carbide segregation. The primary carbide size is 2-12 μm, and it is produced by powder metallurgy. The average size of primary carbides in high-speed steel is 2 μm, and the maximum is 5 μm, which fundamentally solves the problem of coarse and uneven distribution of high-speed steel carbides. What is particularly striking is that the powder metallurgy method can produce ordinary casting and forging methods that are difficult or difficult to produce. High-speed steel with high alloy content and high nitrogen content cannot be produced. Therefore, since high-speed steel chips are hot-pressed into powder metallurgy high-speed steel, experimental research and industrial production have developed vigorously. Correspondingly, the heat treatment process of powder metallurgy high-speed steel And performance research is getting more and more in-depth