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Steel plate with ultrahigh strength and ultrahigh toughness, and preparation method thereof

An ultra-high toughness, ultra-high strength technology, applied in the field of materials, can solve the problems of unsatisfactory strength and wear resistance, low tensile strength and tensile plasticity, poor processing performance, etc., and achieve a strong ability to absorb dislocations , strong applicability, good plastic effect

Inactive Publication Date: 2013-08-21
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008]French scientists Bouaziz et al. (Liang X., Mcermid J.R., Bouaziz O., Wang X., Embury J.D., Zurob H.S., Acta Materialia, Vol.57 3978- 3988(2009)) Fe-22%Mn-1.2%C steel prepared by vacuum melting-hot rolling technology has a yield strength of 380MPa and a tensile strength of 1600MPa, but the tensile plasticity is only 42%, which is still not ideal, and its content The carbon content is as high as 1.2%, which makes the subsequent processing performance worse
[0009]Bao Weiping in China (Bao Weiping, Xiong Zhiping, Zhao Yanjun, Ren Xueping, Effects of different heat treatment processes on the mechanical properties of Fe-30Mn-3Si-4Al TWIP steel , Precision Forming Engineering, Volume 2, 5-9 (2010)) Fe-30Mn-3Si-4Al TWIP steel prepared by vacuum induction furnace argon protection melting method, solid solution at 1000℃ for 45min, water quenching and cooling to room temperature , the average grain size is about 50 μm, its yield strength is 311 MPa, and its tensile strength is about 668 MPa; although its plasticity is good, its relatively low tensile strength still cannot meet the requirements for strength and wear resistance. High application field demands

Method used

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  • Steel plate with ultrahigh strength and ultrahigh toughness, and preparation method thereof
  • Steel plate with ultrahigh strength and ultrahigh toughness, and preparation method thereof
  • Steel plate with ultrahigh strength and ultrahigh toughness, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Metal Fe, metal Mn and C powder are placed in a melting furnace, smelted under the condition of argon, and then poured into ingots. The composition is Mn20.2%, C0.62% by weight, and the balance is Fe and unavoidable impurities;

[0035] The impurity components in the ingot are Si0.182% by weight, Al0.002%, Ni0.046%, Cu0.085%, Nb0.019%, V0.068%, Co0.013%, Ti0.004%, P0 .018%, B0.004%, W0.028%, N0.002%, S0.007%;

[0036] Heating the ingot to 1200±10°C for 1 hour for solution treatment, rolling at 1200±10°C for 6 passes, the deformation amount is 83%, and the final rolling temperature is 900±10°C; the austenite recrystallization zone Rolling is completed at 1050~1200°C, and deformation in the non-recrystallized zone is completed at 900~1000°C;

[0037] After rolling, the temperature was lowered to 820±10°C at a rate of 50°C / s, held for 0.5h, and then water-cooled to room temperature to obtain a steel plate with ultra-high strength and ultra-high toughness, with a tensile ...

Embodiment 2

[0040] Metal Fe, metal Mn and C powder are placed in a melting furnace, smelted under the condition of argon, and then poured into ingots. The composition is Mn20.1%, C0.63% by weight, and the balance is Fe and unavoidable impurities;

[0041] Heat the ingot to 1200±10°C for 2 hours for solution treatment, then roll it for 7 passes at 1200±10°C, the deformation is 84%, and the final rolling temperature is 900±10°C;

[0042] After rolling, cool down to 820±10°C at a rate of 60°C / s, hold for 0.8h, and then water-cool to room temperature to obtain a steel plate with ultra-high strength and ultra-high toughness; the tensile strength is 1960 MPa, and the tensile ductility is 80 %, the yield strength is 360MPa;

[0043] The steel plate with ultra-high strength and ultra-high toughness is cold-rolled with a deformation of 30%; then the temperature is raised to 750±10°C and kept for 10 minutes. The tensile strength of the cold-rolled steel plate is 1930 MPa, the tensile ductility is ...

Embodiment 3

[0046] Metal Fe, metal Mn and C powder are placed in a melting furnace, smelted under the condition of argon, and then poured into ingots. The composition is Mn20.3%, C0.61% by weight, and the balance is Fe and unavoidable impurities;

[0047] Heating the ingot to 1200±10°C for 3 hours for solution treatment, rolling at 1200±10°C for 8 passes, the deformation is 85%, and the final rolling temperature is 900±10°C;

[0048] After rolling, the temperature is lowered to 820±10°C at a rate of 80°C / s, kept for 1 hour, and then water-cooled to room temperature to obtain a steel plate with ultra-high strength and ultra-high toughness; the tensile strength is 1910MPa, and the tensile ductility is 75%. The yield strength is 400MPa;

[0049] The steel plate with ultra-high strength and ultra-high toughness was cold-rolled, and the deformation amount was 20%. Finally, the temperature was raised to 650±10°C and kept for 2 minutes. The tensile strength of the obtained cold-rolled steel pla...

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Abstract

The invention belongs to the technical field of materials, and discloses a steel plate with ultrahigh strength and ultrahigh toughness, and a preparation method thereof. The steel plate comprises components of, by weight: 20.1-20.3% of Mn, 0.61-0.63% of C, and balance of Fe. The preparation method comprises steps that: (1) Fe, Mn and C are smelted under a condition of a protective gas, and the material is used for casting; (2) the material is heated to a temperature of 1200+10 DEG C, and the temperature is maintained for 1-3 hours, such that a solution treatment is carried out; and the material is rolled under a temperature of 1200+10DEG C; (3) the temperature is reduced to 820+10 DEG C with a cooling speed of 50-80 DEG C / s; and the material is water-cooled to room temperature. The steel plate material provided by the invention has extremely high room-temperature tensile strength and good applicability. The preparation method is simple. With a modified technology, controlled appropriate heat treatment parameters and controlled appropriate cooling parameters, the steel plate can be obtained.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a steel plate with ultra-high strength and ultra-high toughness and a preparation method thereof. Background technique [0002] Steel is the most widely used material among all metals. It is widely used in aviation, nuclear energy, ships, petrochemical and other industrial fields. develop. Therefore, the performance of steel is closely related to people's life safety. Currently, the development of steels for the automotive industry is mainly focused on increasing the strength of the steel while maintaining its formability. The development trend of light weight, safety and low energy consumption of automobiles puts forward higher requirements on the variety, specification and quality of steel products. The new design concept of developing lightweight and impact-resistant transportation system requires the development of materials with high strength, good plasticity, excellent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04
Inventor 申勇峰邱从怀薛文颖王沿东左良
Owner NORTHEASTERN UNIV LIAONING
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