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Nb, Ti alloyed low-carbon high-intensity high-plasticity TWIP steel and preparation method thereof

A high-strength, alloying technology, applied in the field of high-strength alloy steel, can solve problems such as impossibility, and achieve the effects of improving impact resistance, flexible production process, and wide application prospects.

Active Publication Date: 2013-11-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current technology cannot meet the above requirements

Method used

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  • Nb, Ti alloyed low-carbon high-intensity high-plasticity TWIP steel and preparation method thereof
  • Nb, Ti alloyed low-carbon high-intensity high-plasticity TWIP steel and preparation method thereof
  • Nb, Ti alloyed low-carbon high-intensity high-plasticity TWIP steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~6

[0056] Table 1 lists the main components in Examples 1 to 6 of the present invention, wherein in addition to the main components listed in each example, 0.02 wt % Si and 0.10 wt % Al are also added. In order to better compare and illustrate the present invention, the compositions of other 8 groups of TWIP steels prepared in the present invention for comparative research are also listed in Table 1 to compare and illustrate the composition range determined by the present invention. In Table 1, each embodiment and comparative example have adopted the preparation process system uniformly, and the properties of the materials prepared under this process system are also listed in Table 1, and the specific preparation process adopted is:

[0057] The starting temperature of hot rolling is 1130~1150°C, the temperature of 950°C is warmed to 900°C, the final rolling temperature is 880°C, and the coil is cooled to 500°C at a cooling rate of 25°C / s. The cumulative reduction of cold rolling...

Embodiment 3

[0064] The difference between Example 3 and Comparative Examples 6 and 7 is that the Mn content is different. It can be seen that when the Mn content is reduced to 22wt% in Comparative Example 6, a small amount of ε martensite appears in the structure at room temperature. The appearance of the brittle phase directly leads to a significantly lower plasticity of the material. On the other hand, in Comparative Example 7, since Mn was too high, the yield strength decreased greatly.

Embodiment 4

[0065] Comparing Example 4 with Comparative Example 8, when the N content is higher, micro-cracks appear, and the strength and plasticity are significantly reduced.

[0066] Examples 1-6 and Comparative Examples 1-8 mainly use the same preparation process to illustrate the effects of components on the structure and properties. In the present invention, steel sheets of different strength levels can also be prepared by adjusting the technological system under the above-mentioned composition system.

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Abstract

The invention, belonging to the field of high-intensity alloy steel, relates to a preparation method of a Nb, Ti alloyed low-carbon high-intensity high-plasticity twinning induced plasticity (TWIP) steel. The steel comprises the following ingredients: 0.05-0.10 wt% C, 23.5-27 wt% of Mn, 0.01-0.03wt% of Si, at most 1.0 wt% of Al, at most 0.01 wt% of P, at most 0.02 wt% of S, 1.0-2.5 wt% of Nb, 0.5-1.25 wt% of Ti, 0.02 -0.08 wt% of N, and the balance consisting of Fe and inevitable impurities. The preparation method comprises the following steps: melting the ingredients and then casting into a casting blank, heating the casting blank and then carrying out hot rolling at the opening rolling temperature of 1100-1150 DEG C with multiple passes and small press quantity to obtain the accumulated deformation degree of more than 60 % at the temperature of more than 950 DEG C, processing the casting blank in a finishing rolling mode at the temperature of 850-900 DEG C, after the hot rolling, rapidly cooling to 400-550 DEG C for reeling, carrying out cold rolling on the steel plate processed by hot rolling with the thickness of 0.5-3.0 mm, preserving the steel plate processed by cold rolling at the temperature of 650-850 DEG C for 3-30 min, and then rapidly cooling to room temperature with the cooling rate of 10-50 DEG C / s. The material prepared by the method can be applied in automobile manufacturing industry. The material has the yield strength of more than 550 MPa and the elongation rate of no less than 60 %, thereby obviously improving the ability of anti-collision and impact of automobile for the first time and greatly increasing the crashworthiness indexes.

Description

technical field [0001] The invention belongs to the field of high-strength alloy steel, and in particular relates to a high-strength, high-plasticity TWIP (TWIP is the abbreviation of Twinning Induced Plasticity (twinning induced plasticity)) steel and a preparation method thereof. Background technique [0002] With the continuous development of the automobile industry, the requirements for light weight, energy saving and safety of automobiles are getting higher and higher. The use of high-strength steel plates can not only reduce the weight of automobiles, but also improve the passive safety of automobiles. High-strength steel is a major trend in the development of automotive steel. In recent decades, in order to meet the development needs of the automobile industry, etc., people have been pursuing the improvement of the comprehensive performance of steel strength and ductility. DP steel (Dual Phase steel, abbreviation for dual phase steel) and TRIP steel (Transformation I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 付立铭单爱党
Owner SHANGHAI JIAO TONG UNIV
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