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Preparing method for high-strength and high-toughness gradient martensite and austenite dual-phase steel

A high-strength, high-toughness, austenitic steel technology, applied in the field of steel and non-ferrous metal processing, can solve the problems of loss of plasticity and reduction of steel plasticity, and achieve the effect of improving toughness, tensile strength, and not changing shape and size

Active Publication Date: 2018-04-10
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional plastic deformation methods, such as rolling, drawing or extrusion, can induce austenite→martensite phase transformation, which can greatly increase the strength of single-phase austenite steel, but significantly reduce the plasticity of steel, such as research reports It is pointed out that after 90% cold rolling deformation of 18-8 type austenitic stainless steel, the tensile plasticity is almost zero, and it is completely brittle
Therefore, using traditional deformation processing technology, austenite→martensite transformation can be induced to improve the strength of austenitic steel, but its plasticity is seriously lost

Method used

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  • Preparing method for high-strength and high-toughness gradient martensite and austenite dual-phase steel
  • Preparing method for high-strength and high-toughness gradient martensite and austenite dual-phase steel
  • Preparing method for high-strength and high-toughness gradient martensite and austenite dual-phase steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 , image 3 , Figure 4 , Figure 6 As shown, the treatment of austenitic steel by unidirectional torsional plastic deformation can improve the tensile strength of existing austenitic steel. First, the commercial 304 austenitic stainless steel bar with a diameter of 10mm is subjected to solution treatment (water cooling) at 1050°C for half an hour, and then processed into a dog-bone shape with a circular cross section (thick at both ends, thin in the middle parallel section, and parallel section The diameter is 4mm) columnar sample, put the columnar sample on the torsion testing machine, and carry out torsion deformation, the temperature of torsion deformation is room temperature, the torsion method is one-way torsion, the torsion speed is 10° / min (slow speed), and the maximum shear rate of the edge is The strain rate is 6.0×10 -5 the s -1 , the torsion angles are 180°, 360° and 720° respectively. image 3 As shown, as the twist angle increases fro...

Embodiment 2

[0033] Such as Figure 5 As shown, the treatment of austenitic steel by unidirectional torsional plastic deformation can improve the tensile strength of existing austenitic steel. First, the commercial 304 austenitic stainless steel bar with a diameter of 10mm is subjected to solution treatment (water cooling) at 1050°C for half an hour, and then processed into a dog-bone shape with a circular cross section (thick at both ends, thin in the middle parallel section, and parallel section For a columnar sample with a diameter of 4mm, place the columnar sample on a torsion testing machine for torsion deformation. The temperature of the torsion deformation is room temperature, the torsion method is unidirectional torsion, the torsion speed is 720° / min (fast), and the maximum shear strain of the edge is The rate is 1.4×10 -2 the s -1 , and the twist angles are 90° and 180°, respectively.

[0034] Figure 5 a. Figure 5 As shown in c, after a unidirectional rapid twist of 90°, th...

Embodiment 3

[0039] Such as figure 2 , image 3 , Figure 6 As shown, the austenitic steel is processed by plastic deformation of reciprocating 90° torsion to improve the tensile strength of the existing austenitic steel. First, the commercial 304 austenitic stainless steel bar with a diameter of 10mm is subjected to solution treatment (water cooling) at 1050°C for half an hour, and then processed into a dog-bone shape with a circular cross section (thick at both ends, thin in the middle parallel section, and parallel section The diameter is 4mm) columnar sample, the columnar sample is placed on the torsion testing machine, carries out torsion deformation, the temperature of torsion deformation is room temperature, the torsion mode is reciprocating 90° torsion, the torsion speed is 1800° / min, and the maximum shear strain rate of the edge is 3.75×10 -2 the s -1 , the times of torsional deformation are 1 time, 100 times and 500 times respectively.

[0040] When twisting back and forth ...

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Abstract

The invention discloses a preparing method for high-strength and high-toughness gradient martensite and austenite dual-phase steel. The preparing method includes the step that the austenite steel is subjected to twisting and deforming treatment. By means of the preparing method, twisting and plastic deforming treatment is conducted on the austenite so that a martensite second phase distributed ina gradient manner can be formed in the austenite, the content of the martensite is gradually increased from the center part to the surface layer, and the tensile strength of the austenite steel is improved. In addition, the size of the martensite second phase is further refined, the content of the martensite on the surface layer is further increased and the tensile strength of the steel is furtherimproved according to the shearing strain deformation path, the shearing strain rate, the deformation temperature and the deformation amount of limited twisting treatment.

Description

technical field [0001] The invention relates to the field of steel and nonferrous metal processing, in particular to a method for preparing a high-strength and high-toughness gradient martensite-austenite dual-phase steel. Background technique [0002] Austenitic steel has the advantages of good plasticity, strong deformation ability, and low temperature toughness, and is widely used in various fields of the national economy. However, the low strength of austenitic steel limits its application as a structural material. In order to further expand the application field of austenitic steel, its yield strength must be further improved. Due to the low stacking fault energy of single-phase austenitic steel, deformation-induced austenite→martensite phase transformation is prone to occur during plastic deformation, and martensite phase is a phase with higher strength and higher hardness in steel. . Therefore, the use of cold plastic deformation to induce martensitic transformatio...

Claims

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Application Information

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IPC IPC(8): C21D7/10C21D6/00
Inventor 郭宁张芝民宋波
Owner SOUTHWEST UNIVERSITY
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