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22MnB5 steel ultra-fine grain microstructure preparation process

A technology of microstructure and preparation process, applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problems of difficulties in large-scale production and application, difficulties in achieving the goal of supply status, and high equipment requirements, so as to achieve grain refinement , less equipment dependence, and good comprehensive mechanical properties

Inactive Publication Date: 2022-01-14
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently commonly used material microstructure refinement methods are mainly severe plastic deformation techniques, such as equal channel angular extrusion, cumulative stack rolling, multi-directional forging and high-pressure torsion, etc. This technology has the following limitations for 20Cr2Ni4A steel: (1) Equipment requirements High; (2) The process is complex; (3) It is difficult to apply in large-scale production; (4) It is difficult to achieve the target of supply status

Method used

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  • 22MnB5 steel ultra-fine grain microstructure preparation process
  • 22MnB5 steel ultra-fine grain microstructure preparation process
  • 22MnB5 steel ultra-fine grain microstructure preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of ultra-fine-grain microstructure preparation technology of 22MnB5 steel, its concrete steps comprise:

[0026] (1) Material preparation: the 22MnB5 steel is processed into a plate with a plate thickness of 0.5 mm;

[0027] (2) Heating: heat the sheet in a resistance furnace to 900°C and keep it warm for 5 minutes;

[0028] (3) Cooling: Cool the high-temperature sheet to 0°C at a rate of 50°C / s;

[0029] (3) Cyclic heat treatment: heat the cooled sheet to 850°C at a rate of 50°C / s and hold it for 1 min, then cool to 0°C at a rate of 50°C / s, repeat the above operations 3 and 5 times respectively.

[0030] A heat-treated sample of 10mm×10mm was prepared by wire cutting, and the sample was ground to 2000# step by step with different types of sandpaper, and then polished and corroded; the 22MnB5 steel was tested at 900°C / 5min, 900°C by means of an optical metallographic microscope. / 5min+3-pass cyclic quenching and 900℃ / 5min+5-pass cyclic quenching were subjected ...

Embodiment 2

[0035] A kind of ultra-fine-grain microstructure preparation technology of 22MnB5 steel, its concrete steps comprise:

[0036] (1) material preparation: the 22MnB5 steel is processed into a plate with a thickness of 3mm;

[0037] (2) Heating: Heat the sheet to 1050°C in a resistance furnace and keep it warm for 30 minutes.

[0038] (3) Cooling: Cool the high-temperature sheet to 250°C at a cooling rate of 30°C / s;

[0039] (3) Cyclic heat treatment: heat the cooled sheet to 850°C at a rate of 50°C / s, keep it warm for 4.5min, then cool it to 250°C at a rate of 30°C / s, repeat the above operations 3 times and 5 times respectively .

[0040] A 10mm×10mm heat-treated sample was prepared by wire cutting, and the sample was ground to 2000# step by step with different types of sandpaper, followed by polishing and corrosion; 22MnB5 steel was subjected to 1050°C / 30min, 1050 / 30min by means of an optical metallographic microscope. The samples of +3-pass cyclic heat treatment and 1050 / 30...

Embodiment 3

[0045] A kind of ultra-fine-grain microstructure preparation technology of 22MnB5 steel, its concrete steps comprise:

[0046] (1) Material preparation: the 22MnB5 steel is processed into a plate with a plate thickness of 0.5 mm;

[0047] (2) Heating: Heat the sheet to 900°C in a resistance furnace and keep it warm for 10 minutes.

[0048] (3) Cooling: Cool the high-temperature sheet to 25°C at a cooling rate of 30°C / s;

[0049] (4) Cyclic heat treatment: The cooled sheet is heated to 850°C at a rate of 50°C / s, held for 0.5min, then rapidly cooled to 0°C, and the above operation is repeated 3 and 5 times.

[0050] The heat-treated experimental steel was processed into hot tensile samples along the rolling direction according to the ASTM-E8-E8M standard by means of wire cutting, and then the tensile properties were tested according to the tensile rate of 1.5 mm / min. The tensile properties are shown in Table 2 Show.

[0051] The mechanical properties of the 22MnB5 steel sampl...

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Abstract

The invention discloses a 22MnB5 steel ultra-fine grain microstructure preparation process. The 22MnB5 steel ultra-fine grain microstructure preparation process comprises the following steps that (1) 22MnB5 steel is machined into a plate with a certain thickness; (2) the plate is heated to 900-1050 DEG C in a resistance furnace, and heat preservation is conducted for a certain time; (3) the plate in the high-temperature state is quickly cooled to 0-250 DEG C; (4) then the plate is rapidly heated to 850-1000 DEG C, heat is preserved for a certain time, then the plate is rapidly cooled to 0-250 DEG C, and the operation is a heat treatment cycle; and (5) the heat treatment cycle operation is repeated for 3-5 times. By means of the process, the microstructure of the 22MnB5 steel plate can be refined to 2 [mu]m, the mechanical property can reach 1800 MPa, and the excellent ductility is achieved.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a preparation process for ultra-fine grain microstructure of 22MnB5 steel. Background technique [0002] At present, energy saving, safety and environmental protection have become a development direction of the automobile industry, which promotes the development of automobile lightweight. 22MnB5 steel has the characteristics of high strength, good toughness and hardenability, and low cost. It is often used in automotive lightweight safety structural stampings, such as A-pillars, B-pillars, and bumpers. However, the grain size of 22MnB5 steel stamping parts obtained by the existing preparation process is relatively large, which limits the development of further improving its mechanical properties and automobile lightweight potential. [0003] Grain refinement is a method that can greatly improve the comprehensive mechanical properties of 22MnB5 steel. However, the curren...

Claims

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Application Information

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IPC IPC(8): C21D6/00C22C38/00C22C38/04C21D9/00C21D1/78
CPCC21D6/005C22C38/04C22C38/002C21D9/0081C21D1/785
Inventor 潘海军虞旺旺韦超凡王知贽吴王平江鹏苗乃明
Owner CHANGZHOU UNIV
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