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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 impracticability, and achieve the effects of improving impact resistance and collision resistance, low production cost, and simple production methods

Active Publication Date: 2012-01-11
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 listed main components in each example, 0.02wt% Si and 0.10wt% Al are added. In order to better illustrate the present invention by comparison, Table 1 also lists the composition of other 8 groups of TWIP steels prepared for comparative research in the present invention to compare and illustrate the composition range determined by the present invention. Each embodiment and comparative example in table 1 have all adopted preparation process system uniformly, and the performance of the material prepared under this process system is also listed in table 1, and the concrete preparation process adopted is:

[0057] The hot rolling start temperature is 1130~1150°C, the temperature is 950°C to 900°C, the final rolling temperature is 880°C, and the cooling rate is 25°C / s to 500°C for coiling. The cumulative reduction of cold rolling is in the range of 50-80%, and the thickn...

Embodiment 3

[0064] The difference between embodiment 3 and comparative examples 6 and 7 is that the Mn content is different. It can be seen that in comparative example 6, when the Mn content was reduced to 22wt%, a small amount of ε martensite appeared in the tissue 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 the Mn was too high, the decrease in the yield strength was relatively large.

Embodiment 4

[0065] Comparing Example 4 with Comparative Example 8, when the N content is high, microcracks appear, and the strength and plasticity are significantly reduced.

[0066] Examples 1-6 and Comparative Examples 1-8 are mainly to illustrate the influence of ingredients on the structure and performance under the same preparation process. In the present invention, steel plates of different strength levels can also be prepared by adjusting the process 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 present invention is a high -strength alloy steel field, especially the abbreviation of TWIP (TWIP for Twinning Induced Plasticity) and its preparation methods. Background technique [0002] With the continuous development of the automotive industry, the requirements for light, energy conservation and safety of automobiles are also getting higher and higher. Using high -strength steel plates can not only achieve lightweights of automobiles, but also improve the passive safety of automobiles.High -strong steel is a major trend in the development of automotive steel.In recent decades, in order to meet the development needs of the automotive industry, people have continuously pursued the improvement of steel strength and comprehensive performance of steel.DP steel (Dual Phase Steel, double -phase steel abbreviations) and TRIP steel (TRANSFORMATION Inuced Plasticity) are widely used in the automotive industry.At present, most of the tensile strength of high...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 付立铭单爱党
Owner SHANGHAI JIAO TONG UNIV
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