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A kind of preparation method of manganese steel material in double grain structure

A technology of grain structure and manganese steel, applied in the field of metallurgy, can solve the problems affecting the anti-intrusion performance and low yield strength of automobile components, and achieve the effect of maintaining continuous yield characteristics and improving yield strength.

Active Publication Date: 2020-03-20
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ART annealing (referred to as CR sample) of the cold-rolled steel plate will obtain complete submicron equiaxed grains. Although the yield limit of the CR sample is high, there will be an obvious yield plateau in the tensile deformation, that is, discontinuous yield phenomenon , the result is that Lüders bands remain on the surface of the workpiece, which is not allowed to appear in automobile stamping parts; after the quenched steel plate is annealed by ART (abbreviated as AQ sample), it still maintains the lath martensitic structure, but the yield strength is generally If it is low, it will affect the anti-intrusion performance of automobile components

Method used

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  • A kind of preparation method of manganese steel material in double grain structure
  • A kind of preparation method of manganese steel material in double grain structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Heat the cold-rolled medium manganese steel plate to 850°C for complete austenitization, and then quench it to room temperature at a cooling rate of 30°C / s to obtain a complete martensite structure.

[0025] 2. Perform surface mechanical grinding treatment (SMAT) on the quenched medium-manganese steel cold-rolled plate. SMAT treatment uses AISI304 stainless steel balls with a diameter of 5mm and a vibration frequency of 10kHz. The cumulative processing time of SMAT on one side of the steel plate was set at 30 minutes. In order to avoid warping of the steel plate caused by mechanical grinding on one side for a long time, the designed treatment time on one side is 10 minutes, then turn the steel plate over and continue to process the other surface, and ensure that the SMAT treatment time on both sides of the steel plate is the same.

[0026] 3. Perform ART annealing on the medium-manganese steel plate after SMAT treatment. The annealing temperature is 650°C, the holdi...

Embodiment 2

[0031] 1. Heat the cold-rolled medium manganese steel plate to 900°C for complete austenitization, and then quench it to room temperature at a cooling rate of 50°C / s to obtain a complete martensite structure.

[0032] 2. Perform surface mechanical grinding treatment (SMAT) on the quenched medium-manganese steel cold-rolled plate. SMAT treatment uses AISI304 stainless steel balls with a diameter of 3mm and a vibration frequency of 30kHz. The cumulative processing time of SMAT on one side of the steel plate is set at 60 minutes. In order to avoid warping of the steel plate caused by mechanical grinding on one side for a long time, the designed treatment time on one side is 10 minutes, then turn the steel plate over and continue to process the other surface, and ensure that the SMAT treatment time on both sides of the steel plate is the same.

[0033] 3. Perform ART annealing on the medium-manganese steel plate after SMAT treatment. The annealing temperature is 700°C, the holdin...

Embodiment 3

[0038] 1. Heat the cold-rolled medium manganese steel plate to 950°C for complete austenitization, and then quench it to room temperature at a cooling rate of 20°C / s to obtain a complete martensite structure.

[0039] 2. Perform surface mechanical grinding treatment (SMAT) on the quenched medium-manganese steel cold-rolled plate. SMAT treatment uses AISI304 stainless steel balls with a diameter of 7mm and a vibration frequency of 20kHz. The cumulative processing time of SMAT on one side of the steel plate is set at 20 minutes. In order to avoid warping of the steel plate caused by mechanical grinding on one side for a long time, the designed treatment time on one side is 10 minutes, then turn the steel plate over and continue to process the other surface, and ensure that the SMAT treatment time on both sides of the steel plate is the same.

[0040] 3. Perform ART annealing on the medium-manganese steel plate after SMAT treatment. The annealing temperature is 600°C, the holdin...

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Abstract

The invention discloses a preparation method of a manganese steel material with a double-grain structure. The preparation method includes the following steps that (1) a medium manganese steel cold-rolled sheet is heated to a certain temperature to being subjected to complete austenitizing, then quenched to the room temperature to obtain a complete martensitic structure; (2) the quenched medium manganese steel cold-rolled sheet is subjected to surface mechanical attrition treatment, and a strong plastic deformation layer with a certain thickness is formed on the surface of a steel plate; and (3) the SMAT treated medium manganese steel plate is subjected to austenite inverse phase transformation annealing, and medium manganese rolled steel with the double-grain structure is obtained. The double-grain structure obtained by the preparation method refers to submicron equiaxial grains with the certain thickness on the surface layer of the steel plate, and includes recrystallized ferrite grains and austenite grains being subjected to inverse phase transformation; and the center of the steel plate is of a strip-shaped structure, and strip-shaped tempered martensite and lamellar inverse phase transformation austenite are included. The manganese steel plate with the double-grain structure can achieve the mechanical property characteristics of two grain structures, that is, continuous yielding is maintained and the yield strength is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for preparing a manganese steel material with a double-grain structure. Background technique [0002] The manganese content of medium manganese steel is generally 3-10wt.%, and the content of metastable austenite in the structure is about 30-40vol.%. Since the proportion of austenite is much higher than that of traditional TRIP steel, the mechanical properties of medium manganese steel are more dependent on the characteristics of metastable austenite and the occurrence of TRIP effect. The earliest report on medium manganese steel can be traced back to 1972. Miller designed the 0.11C-5.7Mn steel for the first time in order to verify whether the Hall-Petch relationship is applicable to the ultrafine grain structure, and found that the structure of the alloy after cold rolling and annealing For all submicron-sized equiaxed grains, which contains about 30vol.% of metasta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/06C22C38/02C22C38/04C22C38/06C21D1/18C21D1/26
Inventor 闫述李天乐李建平王富焱刘东锐张润远
Owner NORTHEASTERN UNIV LIAONING
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