Powder metallurgical tool steel for automobile separation shifting fork

Abstract

The invention discloses powder metallurgical tool steel for an automobile separation shifting fork. The tool steel is prepared from the following raw materials weighed in parts by weight: 75 to 78 parts of iron powder, 20 to 25 parts of 316L austenitic stainless steel powder, 1 to 2 parts of diboron trioxide, 0.2 to 0.4 part of chromium powder, 0.005 to 0.01 part of cerium oxide, 0.2 to 0.6 part of copper sulfide, 0.2 to 0.4 part of molybdenum powder, 0.2 to 0.4 part of nickel powder, 0.2 to 0.4 part of zircon powder, 0.002 to 0.003 part of strontium powder, 0.001 to 0.002 part of germanium disulfide and 0.45 to 0.5 part of a polymerizing agent. According to the powder metallurgical tool steel disclosed by the invention, cementite and high-temperature ledeburite are formed inside a material during the processing; meanwhile, some crystal lattices inside the material are distorted, so the strength of alloy is greatly enhanced; moreover, nitrogen atoms penetrate into the surface of the material, so the surface hardness and the wear resistance are improved; meanwhile, the fatigue strength, the corrosion resistance and the impact resistance are also improved; the automobile separation shifting fork manufactured from the material are resistant to corrosion and impact for a long time, and the service life is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a powder metallurgy tool steel for an automobile separation fork. Background technique [0002] Powder metallurgy technology is a new type of technology that perfectly combines material science and metal forming technology. It is widely used in various industries because of its high efficiency, non-cutting processing, material saving, energy saving, and environmental protection. The material composition of powder metallurgy structural parts is not limited by smelting. It can be added with alloy composition or other structural components, and can be adjusted according to the requirements in a considerable range, so that the mechanical properties can match the steel parts. Effect. Powder metallurgy has a high degree of mechanization, which can not only reduce personnel, but also improve efficiency, thereby saving costs. Powder metallurgy technology can replace the tradi...

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Problems solved by technology

[0003] Automobile separation forks are often used on clutches, and the continuous clutching will cause the forks to wear and impact continuously. Long-term use will cause the forks to age, and the clutch effect is not good, which will affect the normal driving of the car.