Method for deeply hardening high manganese steel through warm extrusion plastic deformation
Through the deep hardening method of temperature extrusion plastic deformation, compressive stress exceeding the yield strength is applied to the wear-resistant parts of the high manganese steel, forming a deep hardening area, solving the problem of insufficient hardness and wear resistance of the hardened layer of the high manganese steel, significantly improving the resistance Grinding performance and durability.
Patent Information
- Application Number
- CN202411362641.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2024-12-27
AI Technical Summary
When high manganese steel is not hardened sufficiently, its hardened layer has low hardness and shallow depth, resulting in insufficient wear resistance of the impact hardened layer, which fails to fully utilize its wear resistance potential, and the hardened layer depth of artificial pre-hardening is small. , poor wear-resistant and long-lasting performance.
Deep plastic deformation hardening method is adopted to apply compressive stress exceeding its yield strength to the high-manganese steel wear-resistant parts by fixing the rotating curved surface on the head of the hydraulic cylinder piston rod to deeply plastic deformation and deformation hardening. , a deep hardened area is formed, with a temperature range of 100°C to 600°C and a compressive stress of 1.1 to 1.4 times the yield strength.
The hardness and depth of the hardened layer of high manganese steel is significantly improved, and its wear resistance and wear-resistant durability are enhanced. The static pressure is much greater than the impact stress, forming a deeper hardened area, improving wear resistance.
Smart Images
Figure CN119194012A_ABST
Abstract
Description
Technical Field
[0001] The invention discloses a method for deep hardening high manganese steel by warm extrusion plastic deformation, belonging to the technical field of material science. Background Art
[0002] High manganese steel is a typical wear-resistant steel that is impact-hardened by the reaction of materials during use. The greater the impact stress, the higher the hardness of the impact hardening; the greater the impact strain and plastic deformation, the greater the depth of the impact hardened layer; but due to the low compressive strength of the material and the small impact force acting on the surface of the high manganese steel wear-resistant parts, the hardening layer of high manganese steel is low in hardness and shallow in depth when it is not fully hardened, resulting in insufficient wear resistance of the impact hardened layer of high manganese steel and failure to fully exert the wear resistance potential of high manganese steel; artificial impact pre-hardening treatment can make high manganese steel produce a hardened layer with a smaller layer depth. The reason is that the compressive stress formed by the impact on the working surface of high manganese steel is small, and the hardening layer after deformation hardening has a lower hardness and a smaller layer depth. Although the wear resistance of its impact hardened layer is higher than that of the material reaction impact hardening during use, due to the small depth of the pre-hardened layer, the wear resistance and durability performance still cannot fully exert the wear resistance potential of high manganese steel. The present invention applies a method for deep hardening of high manganese steel by warm extrusion plastic deformation: a hard alloy head with a rotating curved surface, such as a ball head, is fixed on the head of a hydraulic cylinder piston rod; the hard alloy head acts normally on a working surface of a high manganese steel wear-resistant part with a certain temperature; the pressure stress exerted by the cylinder on the hard alloy head on the high manganese steel wear-resistant part exceeds the yield strength of the high manganese steel wear-resistant part at a certain temperature, so that the working surface of the high manganese steel wear-resistant part produces deep plastic deformation, thereby producing deep deformation work hardening to form a hardened area with a certain shape and a certain depth; the temperature of the high manganese steel wear-resistant part with a certain temperature is 100°C to 600°C, and the compressive stress exceeding the yield strength of the high manganese steel wear-resistant part with a certain temperature is 1.1 times to 1.4 times the yield strength of the high manganese steel wear-resistant part with a certain temperature; the hard alloy head acts normally on the working surface of the high manganese steel wear-resistant part with a certain temperature; and the hardened area is distributed on the working surface of the high manganese steel wear-resistant part according to a certain spacing and arrangement structure. Summary of the invention
[0003] A carbide head with a rotating curved surface is fixed on the head of the hydraulic cylinder piston rod, the carbide head acts normally or approximately normally on the working surface of a high manganese steel wear-resistant part with a certain temperature, and the compressive stress of the carbide head applied by the cylinder to the high manganese steel wear-resistant part exceeds the yield strength of the high manganese steel wear-resistant part at a certain temperature, causing deep plastic deformation on the working surface of the high manganese steel wear-resistant part, thereby producing deep deformation work hardening to form a hardened area with a certain shape and a certain depth.
[0004] The temperature of the high manganese steel wear-resistant parts with a certain temperature during the warm extrusion plastic deformation deep hardening is 100°C to 600°C. Before the warm extrusion plastic deformation deep hardening, the high manganese steel wear-resistant parts are heated to 100°C to 600°C and kept warm for 1 hour to 4 hours. After the high manganese steel wear-resistant parts are taken out of the furnace, the warm extrusion plastic deformation deep hardening is immediately carried out.
[0005] The compressive stress of deep hardening by warm extrusion plastic deformation exceeds the compressive stress value of the yield strength of high manganese steel wear-resistant parts at a certain temperature, and the compressive stress of deep hardening by warm extrusion plastic deformation is 1.1 to 1.4 times the yield strength of high manganese steel wear-resistant parts at a certain temperature.
[0006] The cemented carbide head acts on the working surface of the high manganese steel wear-resistant part with a certain temperature in a normal direction, or in a direction approximately normal to a normal direction as much as possible due to the structural limitation of the high manganese steel wear-resistant part.
[0007] The warm extrusion is a method for deep hardening high manganese steel by static pressure plastic deformation, rather than a conventional impact hardening method for high manganese steel, and the static pressure stress value is much greater than the impact stress value.
[0008] The warm extrusion plastic deformation deep hardening of the rotating surface of the high manganese steel wear-resistant part belonging to the rotating structure adopts double hydraulic cylinders symmetrically about the center line of the rotating surface of the high manganese steel wear-resistant part, and the hydraulic cylinders apply force to extrude at the same time.
[0009] The high manganese steel wear-resistant parts with non-rotating structure are deeply hardened by warm extrusion plastic deformation. The parts with local symmetrical structure on the working surface of the wear-resistant parts are symmetrical with the center line of the local symmetrical structure of the high manganese steel wear-resistant parts, and the hydraulic cylinders are extruded at the same time.
[0010] A method for deep hardening of high manganese steel by warm extrusion plastic deformation, characterized in that the high manganese steel wear-resistant parts after water toughening are put into a furnace, heated to 100°C to 600°C, kept warm for 1 hour to 4 hours, and then taken out of the furnace and immediately subjected to deep hardening by warm extrusion plastic deformation. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 : Schematic diagram of deep hardening of the roller sleeve of high manganese steel wear-resistant parts with rotating structure by warm extrusion plastic deformation.
[0012] Figure 2 : Schematic diagram of deep hardening of high manganese steel wear-resistant roller sleeve by warm extrusion plastic deformation.
[0013] Figure 3 : Schematic diagram of deep hardening of the crushing wall of high manganese steel wear-resistant parts by warm extrusion plastic deformation.
[0014] Figure 4 : Actual picture of deep hardening of high manganese steel wear-resistant parts by warm extrusion plastic deformation.
[0015] Figure 5 : Schematic diagram of deep hardening of the jaw plate of high manganese steel wear-resistant part by warm extrusion plastic deformation.
Claims
1. A method for deep hardening of high manganese steel by warm extrusion plastic deformation, the significant features of which are: (1) a carbide head with a rotating curved surface is fixed to the head of a hydraulic cylinder piston rod, the carbide head acts normally on the working surface of a high manganese steel wear-resistant part with a certain temperature, and the pressure stress exerted by the cylinder on the carbide head exceeds the yield strength of the high manganese steel wear-resistant part with a certain temperature, causing deep plastic deformation of the working surface of the high manganese steel wear-resistant part, thereby generating deep deformation work hardening to form a hardened area with a certain shape and a certain depth; (2) the temperature of the high manganese steel wear-resistant part with a certain temperature that is deep hardened by warm extrusion plastic deformation is 100℃ to 600℃; (3) the compressive stress exceeding the yield strength of the high manganese steel wear-resistant part at a certain temperature is 1.1 to 1.4 times the yield strength of the high manganese steel wear-resistant part at a certain temperature; (4) the cemented carbide head acts on the working surface of the high manganese steel wear-resistant part at a certain temperature in a normal direction, or approximately in a normal direction, or as close to a normal direction as possible due to the structural limitation of the high manganese steel wear-resistant part; (5) the hardened area is distributed on the working surface of the high manganese steel wear-resistant part according to a certain spacing and arrangement structure; (6) the warm extrusion is a method for deep hardening of high manganese steel by static pressure plastic deformation, rather than a conventional impact hardening method for high manganese steel.
2. According to claim 1, the warm extrusion plastic deformation deep hardening of the rotating surface of the high manganese steel wear-resistant part of the rotating structure adopts double hydraulic cylinders symmetrically about the center line of the rotating surface of the high manganese steel wear-resistant part, and the hydraulic cylinders apply force to extrude at the same time.
3. According to claim 1, the non-rotating high manganese steel wear-resistant parts are deeply hardened by warm extrusion plastic deformation, and the parts with local symmetrical structures on the working surface of the wear-resistant parts are symmetrical with the center line of the local symmetrical structure of the high manganese steel wear-resistant parts, and the hydraulic cylinders are extruded simultaneously.
4. A method for deep hardening of high manganese steel by warm extrusion plastic deformation, characterized in that: the high manganese steel wear-resistant parts after water toughening are put into a furnace, heated to 100°C to 600°C, kept warm for 1 hour to 4 hours, and then taken out of the furnace and immediately subjected to deep hardening by warm extrusion plastic deformation.