Ultrahigh-strength, ultrahigh-toughness and low-density double-phase lamellar steel plate and preparation method thereof

A technology with ultra-high toughness and ultra-high strength, which is applied in the manufacture of tools, heat treatment equipment, furnaces, etc., can solve the problems of complex preparation process, low density, and high cost, and achieve the effect of simple preparation process, excellent mechanical properties, and low cost

Active Publication Date: 2019-12-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Layered composite materials prepared by rolling, welding and other processes can combine the advantages of ultra-high strength, high impact toughness, and low density, but the preparation process is complicated and the cost is high, which limits its wide application.

Method used

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  • Ultrahigh-strength, ultrahigh-toughness and low-density double-phase lamellar steel plate and preparation method thereof
  • Ultrahigh-strength, ultrahigh-toughness and low-density double-phase lamellar steel plate and preparation method thereof
  • Ultrahigh-strength, ultrahigh-toughness and low-density double-phase lamellar steel plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The steel plate in this embodiment is smelted, and the alloy composition (mass percentage) of the steel plate is designed as shown in Table 1.

[0042] Table 1

[0043] C Si mn Al Ni B P S Fe 0.200 0.220 0.600 2.000 0.800 0.002 0.005 0.001 margin

[0044] The above alloy composition satisfies: 6[C]+0.8[Mn]+1≥[Al].

[0045] According to the above optimal alloy composition, the corresponding raw materials are smelted and poured into billets, the billets are heated to 1200°C for heat preservation and forged into billets with a thickness of 100mm, and then air-cooled to room temperature after forging.

[0046] After forging, the 100mm thick billet was heated to 1200°C for 60min for homogenization treatment, followed by 7 passes of rolling, the starting rolling temperature was 1086°C, the thickness of the rolled steel plate was 12mm, the total reduction was 88%, and the final rolling temperature was 1033°C, quench the steel plate to ro...

Embodiment 2

[0053] The steel plate in this embodiment is smelted, and the alloy composition (mass percentage) of the steel plate is designed as shown in Table 3.

[0054] table 3

[0055] C Si mn Al Ni B P S Fe 0.260 0.220 1.000 3.000 0.800 0.002 0.005 0.001 margin

[0056] The above alloy composition satisfies: 6[C]+0.8[Mn]+1≥[Al].

[0057] According to the above optimal alloy composition, the corresponding raw materials are smelted and poured into billets, the billets are heated to 1200°C for heat preservation and forged into billets with a thickness of 100mm, and then air-cooled to room temperature after forging.

[0058] After forging, the 100mm thick billet was heated to 1200°C for 60min for homogenization treatment, followed by 7 passes of rolling, the starting rolling temperature was 1086°C, the thickness of the rolled steel plate was 12mm, the total reduction was 88%, and the final rolling temperature was 1042°C, quench the steel plate to ro...

Embodiment 3

[0064] The steel plate in this embodiment is smelted in a vacuum induction furnace, and the alloy composition (mass percentage) of the steel plate is designed as shown in Table 5.

[0065] table 5

[0066] C Si mn Al Ni B P S Fe 0.320 0.220 1.500 4.000 0.800 0.002 0.005 0.001 margin

[0067] The above alloy composition satisfies: 6[C]+0.8[Mn]+1≥[Al].

[0068] According to the above optimal alloy composition, the corresponding raw materials are smelted and poured into billets, the billets are heated to 1200°C for heat preservation and forged into billets with a thickness of 100mm, and then air-cooled to room temperature after forging.

[0069] After forging, the 100mm thick billet was heated to 1200°C for 60min for homogenization treatment, followed by 7 passes of rolling, the starting rolling temperature was 1086°C, the thickness of the rolled steel plate was 12mm, the total reduction was 88%, and the final rolling temperature was 1037°C...

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Abstract

The invention relates to an ultrahigh-strength, ultrahigh-toughness and low-density double-phase lamellar steel plate. The steel plate comprises the following alloy components in percentage by mass: 0.200-0.320% of C, 0.600-2.000% of Mn, 0.200-0.600% of Si, 2.000-4.000% of Al, 0.300-1.200% of Ni, 0.001-0.005% of B, P not more than 0.012%, S not more than 0.005%, and the balance of Fe and inevitable impurities; the inevitable impurities comprise H, N and the like, wherein H is not more than 2.0 ppm, and N is not more than 45 ppm; the steel plate consists of double phases of ferrites and martensites; the ferrites are high-temperature delta ferrites; the martensites are batten martensites; the delta ferrites are distributed in the batten martensites in a lamellar mode; and the volume fractionof the ferrites is not more than 30%. The invention further comprises a preparation method; a high-temperature two-phase area (ferrite+austenite two-phase area) rolling process; the steel plate is quenched to a room temperature online after rolling; a lamellar structure obtained by rolling is retained at the room temperature; and a ferrite+martensite two-phase lamellar structure is obtained at the room temperature, so that the steel plate achieves excellent mechanical performances: the yield strength in the rolling direction is not lower than 1000 MPa, the tensile strength is not lower than 1600 MPa, the ductility is not lower than 8.0%, and the Charpy impact work average value of a V type gap on the surface of a -40 DEG C steel plate is not lower than 350 J.

Description

technical field [0001] The invention relates to the technical field of steel plate materials, in particular to an ultra-high-strength, ultra-high-toughness, low-density dual-phase layered steel plate and a preparation method thereof. Background technique [0002] Realizing the lightweight of modern transportation, marine equipment, aerospace and other high-end equipment is an important part of realizing low-carbon green sustainable development. Taking the automobile industry as an example, research shows that the fuel consumption of automobiles is linearly related to its own weight. Keeping other conditions unchanged, every 10% reduction in vehicle weight can reduce fuel consumption by 6% to 8%, thereby effectively saving energy; and every reduction in fuel consumption by 1L will reduce 2.45kg of CO emissions 2 , It can also reduce the pollution of automobile exhaust to the environment. Lightweight equipment can be achieved by increasing material strength and reducing densi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D6/00C21D8/02C21D9/00C22C38/02C22C38/04C22C38/06C22C38/08
CPCC21D1/18C21D6/001C21D6/005C21D6/008C21D8/0226C21D9/0081C22C38/02C22C38/04C22C38/06C22C38/08C22C38/002C21D2211/005C21D2211/008C22C38/24C21D8/0205C22C38/20C22C38/32C21D1/02C22C38/22
Inventor 邓想涛王昭东吴昊付天亮田勇李家栋
Owner NORTHEASTERN UNIV
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