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A kind of low carbon nano bainitic steel and preparation method thereof

A bainitic steel and carbon nanotechnology, applied in the field of low-carbon nanoscale bainitic steel and its preparation, can solve the problems of difficult promotion of nano-bainitic steel, difficult machining, poor welding performance, etc., and achieve Wide range of industrial application prospects, low cost of alloying, low cost effect

Inactive Publication Date: 2017-05-10
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the nano-bainitic steel developed by Bhadeshia et al. has high strength and good toughness, it has a high carbon content, and once formed, it is difficult to machine and has poor welding performance.
Moreover, the tediousness and long time of the heat treatment of the above-mentioned technology make it difficult for nano-bainitic steel to be vigorously promoted in industrial production.

Method used

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  • A kind of low carbon nano bainitic steel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The composition and weight percentage of the steel in the embodiment of the present invention are: C: 0.49%, Si: 1.58%, Mn: 2.80%, Mo: 0.91%, Al: 3.1%, S: 0.0016%, P: 0.0062%, and the rest For Fe.

[0036] The preparation method is as follows: heat the steel at a rate of 15°C / s to the austenitization temperature of 900°C and hold it for 5 minutes, then carry out austenitic deformation, then quench to 280°C, and then carry out low-temperature constrained deformation, and the cooling rate is 0.5°C / min , the deformation rate is 0.2s -1 , and finally quenched to room temperature.

[0037] According to GB / T228.1-2010 "Metallic Materials Tensile Test Part 1: Room Temperature Test Method", the obtained multi-phase steel products are inspected, and the tensile test is carried out on the Zwick T1-FR020TN A50 standard tensile testing machine. After testing, the tensile strength Rm of the steel is 1845MPa, and the yield strength Rp 0.2 It is 1433MPa, and the total elongation i...

Embodiment 2

[0039] The composition and weight percentage of the steel in the embodiment of the present invention are: C: 0.43%, Si: 1.38%, Mn: 2.61%, Mo: 0.82%, Al: 3.5%, S: 0.0015%, P: 0.0064%, and the rest For Fe.

[0040] The preparation method is as follows: heat the steel at a rate of 15°C / s to the austenitizing temperature of 900°C for 5 minutes, then conduct austenitic deformation, then quench to 300°C, and then carry out low-temperature constrained deformation, and the cooling rate is 0.7°C / min , the deformation rate is 0.5s -1 , and finally quenched to room temperature.

[0041] According to GB / T228.1-2010 "Metallic Materials Tensile Test Part 1: Room Temperature Test Method", the obtained multi-phase steel products are inspected, and the tensile test is carried out on the Zwick T1-FR020TN A50 standard tensile testing machine. After testing, the tensile strength Rm of the steel is 1723MPa, and the yield strength Rp 0.2 It is 1379MPa, and the total elongation is 14.2%.

Embodiment 3

[0043] The composition and weight percentage of the steel in the embodiment of the present invention are: C: 0.40%, Si: 1.85%, Mn: 3.10%, Mo: 0.65%, Al: 2.9%, S: 0.0013%, P: 0.0056%, and the rest For Fe.

[0044] The preparation method is as follows: heat the steel at a rate of 15°C / s to the austenitization temperature of 900°C and hold it for 5 minutes, then carry out austenitic deformation, then quench to 320°C, and then carry out low-temperature constrained deformation, and the cooling rate is 1.0°C / min , the deformation rate is 0.5s -1 , and finally quenched to room temperature.

[0045] According to GB / T228.1-2010 "Metallic Materials Tensile Test Part 1: Room Temperature Test Method", the obtained multi-phase steel products are inspected, and the tensile test is carried out on the Zwick T1-FR020TN A50 standard tensile testing machine. After testing, the tensile strength Rm of the steel is 1785MPa, and the yield strength Rp 0.2 It is 1336MPa, and the total elongation i...

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Abstract

The invention discloses low-carbon nanometer bainitic steel and a method for manufacturing the same, and belongs to the field of metal materials. Composition design of nanometer bainitic steel is optimized, the content of C in the nanometer bainitic steel is reduced, cheap alloy elements such as Si and Al are added into the nanometer bainitic steel, and phase change procedures of the nanometer bainitic are accelerated in low-speed cooling procedures by the aid of a deformation process. The low-carbon nanometer bainitic steel comprises, by weight, 0.2-0.49% of the C, 1.0-2.1% of the Si, 1.5-3.5% of Mn, 0.5-1.2% of Mo, 2.0-4.0% of the Al, less than or equal to 0.01% of P, less than or equal to 0.01% of S and the balance Fe. The low-carbon nanometer bainitic steel and the method have the advantages that the alloy element addition cost can be directly reduced by the aid of the method, the contents of the alloy elements in the low-carbon nanometer bainitic steel are low, accordingly, the homogenization treatment time can be greatly shortened, and the production cost can be saved to a great extent.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a low-carbon nanoscale bainite steel and a preparation method thereof. Background technique [0002] Since Bain discovered and studied the bainite structure in the 1930s, many scholars at home and abroad have devoted themselves to the research of bainite phase transformation theory and the development of bainite steel. In recent years, Bhadeshia and others in the UK have developed a new type of super-strength nano-bainite steel. This steel contains high carbon and silicon. Nanobainite steel contains relatively more alloying elements, so it needs to be homogenized at 1200°C for 2-4 days to make the alloying elements distribute as evenly as possible. After homogenization treatment, after austenitizing for a certain period of time, cool to 100~250°C for a long time isothermal (several days or dozens of days), and a striped bainitic ferrite structure with a thickness of 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21D8/00
Inventor 刘和平王志云孙虎儿李大赵刘斌白培康李志勇孙凤儿刘争光
Owner ZHONGBEI UNIV
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