Powder metallurgy high-speed steel and preparation method thereof

Abstract

The invention discloses powder metallurgy high-speed steel and a preparation method thereof. The method is simpler than the existing powder metallurgy high-speed steel preparation method, steps of high-speed steel mother alloy smelting, atomization for making powder and hot isostatic pressing are omitted, great equipment investment is not needed and the production cost of powder metallurgy high-speed steel is reduced. The impurity content of the powder metallurgy high-speed steel prepared by adopting the method provided by the invention is low and the using performance is excellent. The powder metallurgy high-speed steel provided by the invention is prepared through the steps of 1) preparing powder mixture: weighing raw materials according to set components and proportioning ratio, and mixing and ball-milling the raw materials in a roller-type ball mill to obtain the powder mixture; 2) molding: molding the powder mixture into pressed blanks through cold isostatic pressing; 3) sintering: sintering the pressed blanks in a vacuum or inert gas atmosphere by adopting a hot-pressing sintering technology, heating the pressed blanks to 1100-1250 DEG C during sintering, preserving heat for 30-90 minutes and keeping sintering pressure to be 10-40Mpa; 4) hot forging; 5) heat treatment.

Description

technical field [0001] The invention mainly relates to a powder metallurgy high-speed steel and a preparation method thereof, in particular to an ultra-high alloyed powder metallurgy high-speed steel and a preparation method thereof. Background technique [0002] High-speed steel is the main material for making tools and molds. The traditional metallurgical casting high-speed steel is ledeburite steel, and the steel ingot forms the ledeburite eutectic when it solidifies. The existence of the ledeburst eutectic leads to large and more eutectic carbides in the steel. After rolling or calendering, these Eutectic carbides are still unevenly distributed. With the increase of the alloy content and the increase of the cross-sectional area of ​​the steel, the carbide segregation in the high-speed steel is aggravated, which causes the strength of the high-speed steel to decrease, and it is difficult to make the high-speed steel have good performance. In order to solve this problem,...

AI Technical Summary

Problems solved by technology

However, the current process of powder metallurgy high-speed steel is quite complicated, including smelting, atomization powder making, packaging, hot isostatic pressing and other process steps, which require expensive melting and atomization equipment and hot isostatic pressing equipment, and the material is smelted and prepared In the process, it is difficult to control the impurity content of the material, so the price of powder metallurgy high-speed steel is very expensive

Images