Method for simultaneously improving low-carbon low-alloy steel strength and plasticity

A low-alloy steel, strength technology, applied in the field of metal materials, can solve the problems of steel strength reduction, plasticity reduction, inability to achieve strong plastic matching and other problems

Active Publication Date: 2021-08-31
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in existing studies, the dynamic large deformation process often leads to a sharp decrease in plasticity while significantly improving the strength of tempered high-alloy steel and quenched low-alloy steel. Subsequent annealing treatment is usually required to improve the plasticity of the steel, but Annealing will lead to a significant decrease in the strength of the steel, and it is difficult to restore the plasticity to the original level, and it is impossible to achieve a good strong-plastic matching

Method used

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  • Method for simultaneously improving low-carbon low-alloy steel strength and plasticity
  • Method for simultaneously improving low-carbon low-alloy steel strength and plasticity
  • Method for simultaneously improving low-carbon low-alloy steel strength and plasticity

Examples

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Effect test

Embodiment 1

[0040] A method for simultaneously improving the strength and plasticity of low-carbon low-alloy steel, the steps of the method are as follows:

[0041] (1) The low-carbon low-alloy steel piece corresponding to No. 1 in Table 1 is soaked at 820°C for 0.5h for complete austenitization treatment, and then quenched in water to room temperature to obtain the quenched low-carbon low-alloy steel ;

[0042] (2) Tempering the quenched low-carbon low-alloy steel at 550° C. for 0.5 h, and cooling to room temperature in air after the tempering treatment is completed, to obtain the tempered low-carbon low-alloy steel;

[0043](3) Take a cylindrical sample with a size of φ12×18mm on the tempered low-carbon low-alloy steel, and use a separate Hopkinson pressure bar to perform dynamic large deformation treatment on the sample, with a strain of 0.4 , with a strain rate of 10 3 the s -1 , to obtain low-carbon low-alloy steel after dynamic large deformation;

[0044] (4) The low-carbon low-...

Embodiment 2

[0048] A method for simultaneously improving the strength and plasticity of low-carbon low-alloy steel, the steps of the method are as follows:

[0049] (1) The low-carbon low-alloy steel piece corresponding to No. 2 in Table 1 was subjected to a complete austenitization treatment at 880° C. for soaking and heat preservation for 1 hour, and then quenched in water to room temperature to obtain a quenched low-carbon low-alloy steel;

[0050] (2) Tempering the quenched low-carbon low-alloy steel at 450° C. for 5 hours, and cooling to room temperature in air after the tempering treatment is completed, to obtain the tempered low-carbon low-alloy steel;

[0051] (3) Take a cylindrical sample with a size of φ12×18mm on the tempered low-carbon low-alloy steel, and use the Hopkinson compression bar to carry out dynamic large deformation treatment on the sample. The strain is 0.8, and the strain Rate 10 3 the s -1 , to obtain low-carbon low-alloy steel after dynamic large deformation;...

Embodiment 3

[0056] A method for simultaneously improving the strength and plasticity of low-carbon low-alloy steel, the steps of the method are as follows:

[0057] (1) The low-carbon low-alloy steel piece corresponding to No. 3 in Table 1 was subjected to a complete austenitization treatment at 920° C. for soaking and heat preservation for 2 hours, and then quenched in water to room temperature to obtain a quenched low-carbon low-alloy steel;

[0058] (2) Tempering the quenched low-carbon low-alloy steel at 350° C. for 3 hours, and cooling to room temperature in air after the tempering treatment is completed, to obtain the tempered low-carbon low-alloy steel;

[0059] (3) Take a cylindrical sample with a size of φ12×18mm on the tempered low-carbon low-alloy steel, and use the Hopkinson compression bar to carry out dynamic large deformation treatment on the sample. The strain is 1.2, and the strain Rate 10 3 the s -1 , to obtain low-carbon low-alloy steel after dynamic large deformation...

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Abstract

The invention relates to a method for simultaneously improving low-carbon low-alloy steel strength and plasticity, and belongs to the technical field of metal materials. According to the method, low-carbon low-alloy steel with both high strength and high plasticity is acquired by subjecting quenched-state low-alloy steel which contains Mo as well as one or more of V, Nb and Ti to tempering treatment, dynamic large deformation and annealing treatment in sequence. Crystalline grains can be further refined through carbides precipitated out of the tempered-state low-carbon low-alloy steel which contains the strong carbide forming elements in the dynamic large deformation process; and in the follow-up annealing process, a large number of fine dispersed carbides are precipitated out, so that the improvement of the steel plasticity can be facilitated when a remarkable second-phase strengthening effect is provided.

Description

technical field [0001] The invention relates to a method for simultaneously improving the strength and plasticity of low-carbon low-alloy steel, belonging to the technical field of metal materials. Background technique [0002] Low-carbon low-alloy steel (alloy steel with carbon content less than or equal to 0.2% and total alloy elements less than 5%) usually has high strength (yield strength 500-900MPa), good plasticity (elongation 10%-20%) ) and low cost, it is widely used in various engineering structures such as buildings, automobiles, bridges, ships, pressure vessels, offshore oil drilling platforms, etc., and has significant economic value and social benefits. However, in recent decades, the continuous development of engineering applications has put forward higher requirements on the mechanical properties of steel, especially the yield strength and plasticity. [0003] Large deformation process is a common method of strengthening steel. According to the strain rate of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/26C21D6/00C21D7/04C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54
CPCC21D1/18C21D7/04C21D1/26C21D6/004C21D6/005C21D6/008C22C38/02C22C38/04C22C38/44C22C38/06C22C38/52C22C38/46C22C38/50C22C38/48C22C38/54C21D6/007Y02P10/20
Inventor 程兴旺高冲王迎春李壮李宗远张汉驰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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