Method for acquiring bainite complex phase tissue with workpieces with different cross section thicknesses

A bainite and workpiece technology is applied in the field of obtaining bainite complex structure for workpieces with different cross-sectional thicknesses, which can solve the problem that the production process and environmental protection pressure are only suitable for small batch production, and achieve strong product performance, simple process and wide range. The effect of applying the effect

Active Publication Date: 2019-12-31
紫荆浆体管道工程股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the cooling medium used in the salt bath and the thickness of the workpiece are both at the same temperature as bainite, and a stable bainite structure is obtained, but the production process and environmental pressure are only suitable for small batch production

Method used

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  • Method for acquiring bainite complex phase tissue with workpieces with different cross section thicknesses
  • Method for acquiring bainite complex phase tissue with workpieces with different cross section thicknesses
  • Method for acquiring bainite complex phase tissue with workpieces with different cross section thicknesses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Such as figure 1 , 2 As shown, this implementation takes the conventional technology used in the semi-self-grinding liner, and the semi-self-grinding T-type liner is taken as an example. The lower part of the liner is the lifting surface, which is responsible for lifting the ore and steel balls with high strength and good scratch resistance. The diameter of the cross section is about 350 mm. The higher the actual requirement, the better. The upper part belongs to the installation surface and the working surface. The working surface is responsible for the high impact wear resistance of mines and steel balls. The higher the toughness, the better. The diameter of the section is about 100 mm. The actual toughness is the better. The organization of the product requires the bainite complex structure. The specific processing flow is as follows: using conventional quenching water or oil or air cooling or quenching medium for quenching, the bottom section is 350 mm thi...

Embodiment 2

[0047] Such as figure 1 , 3 Shown: This embodiment takes the steel rail structure as an example. First, the material is formed; then the thinner part is installed with auxiliary tooling so that the thickness of the thinner part is basically the same as the thicker one, and then the steel rail with the auxiliary tooling The structure is put into the quenching process, when the temperature enters the bainite temperature, isothermal or slow cooling is performed, and most of the bainite complex structure is obtained and then slowly cooled to room temperature, then taken out, and the auxiliary tooling is removed to complete the production process of the rail.

[0048] Then compare the product with the existing rail structure and test as follows:

[0049]

[0050] It can be seen that the rail structure obtained by the method of this embodiment has higher strength and better toughness than the existing rail structure, so that the service life of the rail structure is longer. The applicati...

Embodiment 3

[0052] Such as figure 1 , 4 Shown: In this embodiment, the wheel structure is taken as an example. First, the material is annealed and then rough-processed and formed, leaving a small amount of finishing dimensions; then, auxiliary tooling is installed on the thinner part to make the thickness of the thinner part equal to The thicker one is basically the same, and then the wheel structure with the auxiliary tooling is mist-cooled. When the temperature enters the bainite temperature, it is isothermally cooled to room temperature for about 40 minutes, and then taken out. The auxiliary tooling is removed and then finished to complete the Processing of wheel structure.

[0053] Then compare the product with the existing wheel structure and test as follows:

[0054]

[0055] It can be seen that, compared with the existing wheel structure, the wheel structure obtained by the method of this embodiment has higher strength and better toughness in the middle part, which makes the service lif...

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Abstract

The invention provides a method for acquiring bainite complex phase tissue with workpieces with different cross sections thicknesses. In the heat treatment method of products with different cross sections in the bainite complex phase tissue, performance requirements for different regions of the cross-sections on different workpieces in the bainite complex phase tissue are different or the performance requirements of different thicknesses for different parts of the same workpiece are the same, an additional protective layer is adopted, when the workpieces are subjected to quenching treatment and tempering treatment, and the same performance or different performance requirements of the workpiece quality can be ensured.

Description

Technical field [0001] The invention relates to a heat treatment method for workpieces with different cross-sections of a bainite complex structure, externally machined and protected, and then quenched and tempered. Background technique [0002] The common bainite heat treatment process is to obtain the bainite complex structure at a medium temperature of 500 degrees to a low temperature of 200 degrees. The workpiece is heated to a single austenite zone and then isothermal or air cooling is used. The common quenching medium in the cooling process is water , Oil, quenching medium, etc., can obtain bainite complex structure such as bainite, Bema complex, Austell complex, and carbide-free bainite. [0003] However, in the actual production process, the size of the workpiece is relatively complicated, and often encountered workpieces with different cross-sections and different cooling speeds, too much machining allowance can be reserved for low-strength steels below HRC30, and processe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/20C21D1/84
CPCC21D1/20C21D1/84C21D2211/002
Inventor 刘鑫朱明刘文利
Owner 紫荆浆体管道工程股份公司
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