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CN-121976146-A - Nanocrystallization strengthening treatment process for surface of high-carbon steel bearing steel wire

CN121976146ACN 121976146 ACN121976146 ACN 121976146ACN-121976146-A

Abstract

The application belongs to the technical field of surface treatment of high-carbon steel bearing steel wires, and relates to a nanocrystallization strengthening treatment process for the surfaces of high-carbon steel bearing steel wires. A high-carbon steel bearing steel wire surface nanocrystallization strengthening treatment process comprises the following treatment steps of S1, pretreatment; S2, low-temperature ion carburization, namely taking the pretreated high-carbon steel bearing steel wire, placing the pretreated high-carbon steel bearing steel wire into a heat treatment device, vacuumizing, introducing carburized gas, and performing low-temperature ion carburization, and S3, performing gradient cooling treatment on the high-carbon steel bearing steel wire subjected to the low-temperature ion carburization. The application thoroughly eliminates the conventional additional nano layer preparation thought, solves the defects of weak binding force and uneven performance of the nano layer in the prior art by the cooperative cooperation of the working procedures, realizes the stable preparation of the original nano reinforced layer, and remarkably improves the surface hardness, the wear resistance and the binding stability of the high-carbon steel bearing steel wire and a matrix.

Inventors

  • LV BIN
  • WU HUILIN

Assignees

  • 凯明(常州)新材料科技有限公司

Dates

Publication Date
20260505
Application Date
20260210

Claims (9)

  1. 1. The nano strengthening treatment process for the surface of the high-carbon steel bearing steel wire is characterized by comprising the following treatment steps: S1, preprocessing, namely taking a high-carbon steel bearing steel wire, degreasing and polishing the surface of the high-carbon steel bearing steel wire, washing and drying the high-carbon steel bearing steel wire, and collecting the high-carbon steel bearing steel wire to obtain a preprocessed high-carbon steel bearing steel wire; S2, performing low-temperature ion carburization treatment, namely taking a pretreated high-carbon steel bearing steel wire, placing the steel wire in a heat treatment device, vacuumizing, introducing carburized gas, and performing low-temperature ion carburization treatment; S3, performing gradient cooling treatment, namely performing gradient cooling treatment on the high-carbon steel bearing steel wire subjected to low-temperature ion carburization treatment, so as to prepare the high-carbon steel bearing steel wire with the surface coated with the original nano reinforcing layer.
  2. 2. The process for nanocrystallization strengthening treatment of the surface of the high-carbon steel bearing steel wire according to claim 1, wherein the carburizing gas comprises a mixed gas of acetylene and argon in a volume ratio of 1:8-10, the introducing rate of the mixed gas is 5-12L/min, and the thickness of the original nano strengthening layer is 30-80 μm.
  3. 3. The process for nanocrystallization strengthening treatment of the surface of the high-carbon steel bearing steel wire according to claim 1, wherein the carburizing temperature in the low-temperature ion carburizing treatment is 700-780 ℃, and the carburizing time is 2-4h.
  4. 4. The process for the nanocrystallization strengthening treatment of the surface of the high-carbon steel bearing steel wire according to claim 1, wherein the gradient cooling treatment is carried out according to a cooling rate of 5-8 ℃ per minute, wherein the cooling is carried out firstly to 650 ℃, the temperature is kept for 30 minutes, then the cooling rate is 5-8 ℃ per minute, and the cooling is carried out to 500 ℃ and the temperature is kept for 30 minutes, so that the gradient cooling treatment can be completed.
  5. 5. The process for nano strengthening the surface of the high-carbon steel bearing steel wire according to claim 1, wherein the high-carbon steel bearing steel wire comprises the following substances in parts by weight: 0.82-1.05 parts of C; 0.25-0.37 parts of Si; mn 0.72-0.85 part; 0.40-2.0 parts of Cr; the balance being Fe.
  6. 6. The process for nanocrystallization strengthening treatment of the surface of a high-carbon steel bearing steel wire according to claim 5, wherein the high-carbon steel bearing steel wire further comprises 0.015-0.05 parts by weight of Ti and 0.015-0.05 parts by weight of Nb.
  7. 7. The process for nano-strengthening the surface of a high-carbon steel bearing steel wire according to claim 1, further comprising: S4, performing cryogenic aging treatment on the high-carbon steel bearing steel wire subjected to gradient cooling by adopting liquid nitrogen indirect refrigeration, performing low-temperature tempering modification treatment after the cryogenic cooling is finished, introducing argon for protection in the tempering process, and naturally cooling to room temperature after tempering, thereby obtaining the high-carbon steel bearing steel wire with the surface strengthened by nanocrystallization.
  8. 8. The process for nanocrystallization strengthening treatment of the surface of the high-carbon steel bearing steel wire according to claim 7, wherein the temperature of the cryogenic aging treatment is-120 to-80 ℃ and the heat preservation time is 2-3 hours.
  9. 9. The nanocrystallization strengthening treatment process for the surface of the high-carbon steel bearing steel wire according to claim 7 is characterized in that the low-temperature tempering modification treatment comprises the steps of preserving heat for 1.5-2.5 hours at 200-240 ℃, introducing argon for protection, and naturally cooling to room temperature after tempering.

Description

Nanocrystallization strengthening treatment process for surface of high-carbon steel bearing steel wire Technical Field The invention belongs to the technical field of surface treatment of high-carbon steel bearing steel wires, and relates to a nanocrystallization strengthening treatment process for the surfaces of high-carbon steel bearing steel wires. Background The high-carbon steel bearing wire is used as a key raw material of a bearing core part, is widely applied to a plurality of fields of machinery manufacture, rail transit, aerospace and the like, and the surface performance of the high-carbon steel bearing wire directly determines the bearing capacity, the wear resistance and the service life of the bearing. Because of high-frequency impact, frictional wear and corrosive medium erosion in the service environment, extremely high requirements are put on the surface hardness, wear resistance, corrosion resistance and combination stability with a matrix of the high-carbon steel bearing steel wire. At present, a surface strengthening technology is generally adopted in the industry to improve the performance of the steel wire, wherein nano strengthening is a main research direction of surface modification of the high-carbon steel bearing steel wire because the nano strengthening can obviously improve the surface hardness and wear resistance of the material. The existing nano-treatment of the surface of the high-carbon steel bearing steel wire is mainly dependent on conventional processes such as external mechanical impact or external coating deposition, the nano-layer prepared by the process is of an additional structure, the combination with a matrix is only mechanical embedding, the inherent defects of weak binding force, easy falling, uneven performance distribution and the like exist, the long-term complex service requirement is difficult to be met, and the development of the nano-treatment process of the surface of the high-carbon steel bearing steel wire, which is simple in process, strong in synergy, capable of realizing stable formation of the original nano-layer and excellent in comprehensive performance, is needed. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a nanocrystallization strengthening treatment process for the surface of a high-carbon steel bearing steel wire. In order to solve the technical problems, the invention adopts the following technical scheme: the nano strengthening treatment process for the surface of the high-carbon steel bearing steel wire comprises the following treatment steps: S1, preprocessing, namely taking a high-carbon steel bearing steel wire, degreasing and polishing the surface of the high-carbon steel bearing steel wire, washing and drying the high-carbon steel bearing steel wire, and collecting the high-carbon steel bearing steel wire to obtain a preprocessed high-carbon steel bearing steel wire; S2, performing low-temperature ion carburization treatment, namely taking a pretreated high-carbon steel bearing steel wire, placing the steel wire in a heat treatment device, vacuumizing, introducing carburized gas, and performing low-temperature ion carburization treatment; S3, performing gradient cooling treatment, namely performing gradient cooling treatment on the high-carbon steel bearing steel wire subjected to low-temperature ion carburization treatment, so as to prepare the high-carbon steel bearing steel wire with the surface coated with the original nano reinforcing layer. Through the technical scheme, the application constructs a basic process frame combining pretreatment, low-temperature ion carburization and gradient cooling to form an integrated surface nanocrystallization strengthening system. The pretreatment process is characterized in that the surface cleaning treatment is carried out, impurities and defects on the surface of the steel wire are removed, a clean and smooth surface is provided for the subsequent carburization treatment, the influence of the impurities on the penetration of carbon atoms and the formation of nano layers is avoided, the low-temperature ion carburization utilizes the atomic-level modification effect to enable the carbon atoms to penetrate into the surface of the steel wire, the subsequent gradient cooling induction effect is combined, the original nano reinforced layer is promoted to be separated out of the surface carbon atoms in situ, the atomic-level combination of the nano layers and a matrix is realized, the gradient cooling is carried out, the internal stress generated by abrupt temperature change is avoided through the slow and orderly temperature regulation, meanwhile, the stable environment is provided for the uniform growth of the original nano crystals, and the additionally arranged deep cooling aging-tempering synergistic process further optimizes the nano layer structure and improves the performance stability. The technical scheme of the application t