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Method for rapidly refining metastable austenite grain structure

A technology for austenite grain refinement, which is applied in the field of rapid refinement of metastable austenite grain structure, can solve the problem of low grain refinement strengthening efficiency, and achieve the purpose of suppressing dynamic recovery or recrystallization, grain small tissue effect

Active Publication Date: 2020-05-12
河南盾刀智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above situation, the purpose of the present invention is to provide a method for rapidly refining the metastable austenite grain structure, the purpose is to solve the traditional plastic deformation method to produce processing strengthening or deformation-induced phase transformation to form fine-grain strengthening efficiency Low problems, providing a method that can achieve rapid processing strengthening, rapid generation of deformation-induced martensite, and refine grains to achieve fine-grain strengthening

Method used

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  • Method for rapidly refining metastable austenite grain structure
  • Method for rapidly refining metastable austenite grain structure
  • Method for rapidly refining metastable austenite grain structure

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Mill the commercial 304 stainless steel hot-rolled plate to the upper and lower surfaces smooth and the required size. The material obtained after milling is vacuum-sealed and kept in an air furnace at 1100°C for 1 hour. After being released from the furnace, it is quickly water quenched. The stainless steel plate is cold-rolled and deformed, and the deformation of each pass is 10%. After one pass of cold rolling, it goes directly to the next pass of rolling, that is, continuous cold rolling, to obtain a rolled sheet material with a deformation of 70%, and then put the cold-rolled sheet into Soak in liquid nitrogen for 5 minutes, and then carry out ultra-low temperature rolling after soaking. Finally, the total deformation of the plate is 80%. Finally, the plate is heat-treated and annealed at 850°C for 5 minutes. The total processing time is 20 minutes, figure 2 This is the final photo of the grain structure, the grain size is 4.5 μm.

Embodiment 2

[0038] Milling of commercial 304 stainless steel hot rolled plate to the upper and lower surface finish and required size. After the plate is vacuum sealed, it is kept in an air furnace at 1100°C for 1 hour. After being out of the furnace, it is quickly water-quenched, and then the quenched 304 stainless steel plate is cold-rolled and deformed at room temperature. The deformation of each pass is 10%. Then go directly to the next rolling, that is, continuous cold rolling, to obtain a rolled plate with a deformation of 30%, and then put the cold-rolled plate into liquid nitrogen for 10 minutes, and then perform ultra-low temperature rolling on the soaked rolling, The final total deformation was 50% of the sheet. Finally, heat treatment and annealing are performed on the plate, the annealing temperature is 850°C, and the temperature is kept for 5 minutes. The total processing time is 25 minutes, image 3 The photo of the final grain structure, the grain size is 8.7 μm.

Embodiment 3

[0040]Milling of commercial 304 stainless steel hot rolled plate to the upper and lower surface finish and required size. After the plate is vacuum sealed, it is kept in an air furnace at 1100°C for 1 hour. After being out of the furnace, it is quickly water-quenched, and then the quenched 304 stainless steel plate is cold-rolled and deformed at room temperature. The deformation of each pass is 10%. Then go directly to the next rolling, that is, continuous cold rolling, to obtain a rolled plate with a deformation of 20%, and then put the cold-rolled plate into liquid nitrogen for 10 minutes, and then perform ultra-low temperature rolling on the soaked rolling, Finally, the total deformation of the plate is 30%. Finally, the plate is annealed by heat treatment. The annealing temperature is 850°C, the temperature is kept for 5 minutes, and the total processing time is 25 minutes. Figure 4 This is the final grain structure photo, with a grain size of 10 μm.

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Abstract

The invention relates to the field of metal material processing, in particular to a method for rapidly refining a metastable austenite grain structure. The method can realize metastable austenite grain refinement and rapidly improve the mechanical property and the processing deformation characteristic of original steel, and belongs to the field of metal material processing. According to the method, through the low-temperature effect of the ultralow-temperature environment, the atomic diffusion migration capacity in the material is obviously reduced, and the deformation heat generated in the rolling deformation process is rapidly consumed, so that the occurrence of dynamic recovery or recrystallization in the rolling process is effectively inhibited, the structure is remarkably refined, meanwhile, deformation defects such as dislocation, dislocation cells / walls and substructures are continuously accumulated to reach high density, and meanwhile, the metastable austenitic stainless steelcan be more rapidly converted into martensite through the low-temperature effect, the grain structure of the martensite is finer, annealing treatment is conducted through fine martensite grains, and finally austenite structure with refined grains is obtained.

Description

technical field [0001] The invention relates to the field of metal material processing, and in particular discloses a method for rapidly refining the metastable austenite grain structure, which can realize the refinement of the metastable austenite grain and rapidly improve the mechanical properties of the original steel and processing deformation characteristics, belonging to the field of metal material processing. Background technique [0002] Austenitic stainless steel has become an important engineering material in modern industry due to its excellent corrosion resistance and formability. However, the strength and hardness of austenitic stainless steel are low, and its products are prone to scratches, wear or yield deformation and cause failure. , thereby reducing product quality and service life. [0003] For stainless steel, the strengthening effect is mainly achieved through processing strengthening and fine-grain strengthening, especially those steels that can under...

Claims

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Application Information

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IPC IPC(8): C21D8/02C21D1/18C21D1/26C21D6/04C21D1/773C21D1/74
CPCC21D8/0236C21D1/18C21D1/26C21D6/04C21D1/773C21D1/74C21D2211/001C21D2211/008
Inventor 史金涛张辉平
Owner 河南盾刀智能科技有限公司
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