Surface nitriding and quenching composite treatment technology of metal workpiece based on lubricant storage and secondary lubrication and product

Abstract

The invention provides a surface nitriding and quenching composite treatment technology of a metal workpiece based on lubricant storage and secondary lubrication and a product. By utilizing a gas nitriding and ionitriding technology, proper technological parameters are selected, and a nitriding layer with a certain thickness is formed on the surface, suitable for nitriding treatment, of the metal workpiece. Quenching (ordinary quenching, induction quenching, laser quenching and the like) is carried out on the workpiece after being nitrided, a nitride decomposes, nitrogen ions diffuse toward the heart part, and the depth and the hardness of hardening are synchronously improved. Due to proper quenching parameters, when the nitride decomposes, micropores are formed in the surface layer of the workpiece, meanwhile, the concentration of a solid solution N in martensite is increased, and the pressure stress of the surface layer is strengthened. The temper softening resistance can be improved due to high concentration of the solid solution N, the wear-resisting property of the surface can be improved due to high hardness and large pressure stress, and the action of storing a lubricant is generated with existence of the micropores so as to change the friction state and lower the friction coefficient. The antifriction and wear resistance performance with lubricant collection of a metal part is realized through nitriding / quenching composite treatment.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and in particular relates to a combined surface nitriding and quenching treatment technology and product of a metal workpiece based on oil storage secondary lubrication. Background technique [0002] When the mechanical parts are working, not only the two working surfaces are in contact with each other, but also there is relative motion. The working parts will inevitably produce friction, and the useless work done to overcome the friction accounts for more than 30% of the total power consumption. Component failures caused by wear and tear account for about 80% of component failures. For the friction phenomenon, human beings began to study and use it very early, and also achieved a lot of results. From the design of machinery or parts, to the selection of materials, processing and manufacturing, and operation and maintenance, the wear life is fully considered. [0003] Workpiece sur...

AI Technical Summary

Problems solved by technology

There are also many surface strengthening technologies that use thermal spraying technology and laser cladding technology to prepare wear-resistant coatings. The methods of adding coatings to these surface strengthening technologies either achieve self-lubricating properties, or increase the surface hardness of the workpiece to improve wear resistance. However, there will be defects such as weak combination with the matrix

[0004] As a traditional surface strengthening technology, nitriding technology can obtain a hardened layer with a certain thickness on the surface of steel parts and improve the wear resistance of the workpiece. However, the nitriding treatment takes a long time and it is difficult to achieve high surface hardness and thick infiltrated layer at the same time.

Patent ZL201380072803.1 discloses a nitrocarburized high-frequency hardened steel part, which provides excellent temper softening resistance, exhibits high compressive residual stress near the surface and surface Soft nitriding induction hardened steel parts with excellent fatigue strength

Images