The Effect of Solution Treatment On G80T High Temperature Bearing Steel

Publish Time: 06/21 2021 Author: Site Editor Visit: 14405

G80T steel is a special type of M50 steel smelted by electroslag directional solidification, which belongs to the second-generation bearing steel with medium temperature resistance to 350℃. Judging from the current domestic and foreign reports, M50 steel is still the main material for the manufacture of aero-engine main shaft bearings, with a maximum operating temperature of 315°C. The ever-increasing DN value (the product of the bearing diameter and the bearing speed) requires the main bearing of the engine to have higher bending and torsion resistance, which puts higher requirements on the toughness of the bearing material. The existing research results show that the original material of G80T steel can be refined through dynamic recrystallization, thereby achieving the purpose of improving the toughness of the bearing material and increasing the strength of the material. In order to ensure that the grains of the hot-deformed G80T steel have both fine grains and high hardness after solution treatment, the researchers selected G80T steel with fine structure grains after dynamic recrystallization as the raw material, and studied the austenitizing temperature And the influence of austenitizing time on structural properties.

The test material is a directional electroslag remelting smelting, a cast high temperature bearing steel G80T steel ingot with a diameter of Φ150cm, and its composition (mass fraction, %) is C0.82, Cr4.11, Mo4.19, V0.97, and the balance Fe .

After the ingot is subjected to high temperature diffusion annealing for 5 hours, it is sampled and processed into a cylindrical sample of Φ8mm×15mm. In order to refine the grain size through dynamic recrystallization, the thermal simulation tester Gleeble-3800 was kept at 1200°C for 2 minutes, then cooled to 1050°C at 5°C/min, and 60% compression was performed at a deformation rate of 10s-1. Deformed, then cooled to 600°C at 5°C/min and then cooled to room temperature to obtain a deformed sample.

The hot-compressed sample is solid-solution treated in a box-type resistance furnace at a temperature of 950, 1000, 1050, 1100, 1150, 1200 ℃, to the warm charging furnace, the holding time is 5, 10, 30, 60 min, Quick oil quenching after being out of the furnace. The sample was uniformly slit into two halves along the direction of pressure loading during thermal compression, and the structure and hardness of the central part of the longitudinal section were observed.

The results show that with the increase of the solution temperature, the austenite grain size slowly increases to about 7-8μm before 1050℃, and then grows abnormally with the further increase of the solution temperature. The microhardness of the test steel first increases and then decreases with the solid solution temperature. The microhardness reaches 921HV0.2 at 1050℃, which is caused by the combined effect of fine-grain strengthening and carbide precipitation strengthening. The thermodynamic calculation results show that the grain growth behavior of the 60% hot-compressed G80T steel during the re-austenitization process is controlled by the diffusion of alloying elements, and its diffusion activation energy is 333kJ/mol.

Please keep the source and address of this article for reprinting:The Effect of Solution Treatment On G80T High Temperature Bearing Steel

Minghe Die Casting Company are dedicated to manufacture and provide quality and high performance Casting Parts(metal die casting parts range mainly include Thin-Wall Die Casting,Hot Chamber Die Casting,Cold Chamber Die Casting),Round Service(Die Casting Service,Cnc Machining,Mold Making,Surface Treatment).Any custom Aluminum die casting, magnesium or Zamak/zinc die casting and other castings requirements are welcome to contact us.

ISO90012015 AND ITAF 16949 CASTING COMPANY SHOP

Under the control of ISO9001 and TS 16949,All processes are carried out through hundreds of advanced die casting machines, 5-axis machines, and other facilities, ranging from blasters to Ultra Sonic washing machines.Minghe not only has advanced equipment but also have professional team of experienced engineers,operators and inspectors to make the customer’s design come true.

POWERFUL ALUMINUM DIE CASTING WITH ISO90012015

Contract manufacturer of die castings. Capabilities include cold chamber aluminum die casting parts from 0.15 lbs. to 6 lbs., quick change set up, and machining. Value-added services include polishing, vibrating, deburring, shot blasting, painting, plating, coating, assembly, and tooling. Materials worked with include alloys such as 360, 380, 383, and 413.

Zinc die casting design assistance/concurrent engineering services. Custom manufacturer of precision zinc die castings. Miniature castings, high pressure die castings, multi-slide mold castings, conventional mold castings, unit die and independent die castings and cavity sealed castings can be manufactured. Castings can be manufactured in lengths and widths up to 24 in. in +/-0.0005 in. tolerance.

ISO 9001 2015 certified manufacturer of die cast magnesium and mold manufacturing

ISO 9001: 2015 certified manufacturer of die cast magnesium, Capabilities include high-pressure magnesium die casting up to 200 ton hot chamber & 3000 ton cold chamber, tooling design, polishing, molding, machining, powder & liquid painting, full QA with CMM capabilities, assembly, packaging & delivery.

Minghe Casting Additional Casting Service-investment casting etc

ITAF16949 certified. Additional Casting Service Include investment casting,sand casting,Gravity Casting, Lost Foam Casting,Centrifugal Casting,Vacuum Casting,Permanent Mold Casting,.Capabilities include EDI, engineering assistance, solid modeling and secondary processing.

Casting Industries Parts Case Studies for: Cars, Bikes, Aircraft, Musical instruments, Watercraft, Optical devices, Sensors, Models, Electronic devices, Enclosures, Clocks, Machinery, Engines, Furniture, Jewelry, Jigs, Telecom, Lighting, Medical devices, Photographic devices, Robots, Sculptures, Sound equipment, Sporting equipment, Tooling, Toys and more.