Lightweight and high strength and ductility automotive steel using silicon instead of aluminum and preparation method of the steel

A lightweight and tough technology, applied in metal rolling and other directions, can solve problems such as poor weldability and formability, reduce material stiffness, and reduce density, so as to improve toughness, enhance matrix strength, and avoid cracks.

Inactive Publication Date: 2019-11-22
DONGGUAN UNIV OF TECH
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Problems solved by technology

[0003] At present, high-strength and tough automotive steel has been developed to the third generation. Typical products such as Q&P steel, medium manganese steel, low-density steel, super bainitic steel, etc.; the future development of automotive steel is oriented towards high strength, toughness and light weight Therefore, there are many studies on the combination of low-density steel and medium-manganese steel, but there are also many problems. The following lists several typical domestic invention patents for discussion, and clarifies the characteristics and advantages of the invention patent; Chinese invention patent CN201810362095. X introduces a high-strength and tough steel for automobiles with a strength-plastic product greater than 45GPa·% and its preparation method. Medium carbon, medium manganese and a certain amount of aluminum are used as the main alloy system to reduce the density. Cold rolling and annealing make the tensile strength exceed 1000MPa, and the strong-plastic product is greater than 45GPa·%, but the medium carbon and higher alloy system used in this invention is not suitable for structural parts that undertake welding and forming, and A higher content of Al will seriously reduce the stiffness of the material, which is also inappropriate for automotive load-carrying parts. Therefore, it is necessary to redesign from the perspective of alloy system design to meet today's and future lightweight high-strength automotive steels; Chinese invention patent CN201810507557 .2 Introduced a 1200MPa high-strength high

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  • Lightweight and high strength and ductility automotive steel using silicon instead of aluminum and preparation method of the steel
  • Lightweight and high strength and ductility automotive steel using silicon instead of aluminum and preparation method of the steel
  • Lightweight and high strength and ductility automotive steel using silicon instead of aluminum and preparation method of the steel

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Example Embodiment

[0020] Example 1:

[0021] A method for preparing lightweight, high-strength and tough automotive steel using silicon instead of aluminum includes the following steps;

[0022] 1) Weigh the alloy composition, weigh 0.1wt.% C, 3.5wt.% Si, 4.0wt.% Mn, 0.5wt.% Ni, 0.01wt.% Ti according to the weight percentage of the alloy composition. The balance is Fe;

[0023] 2) Smelting and casting, vacuum smelting and casting the alloy components weighed in step 1) into a 40mm thick billet;

[0024] 3) Hot-rolling, the 40mm thick cast slab is kept at 1200℃ for 2.5h, then hot-rolled at 1100℃, the final rolling temperature is 950℃, hot-rolled to 3mm, the total reduction ratio is 92.5%, and air-cooled to room temperature Obtain the silicon-substituted aluminum lightweight high-strength automotive steel of the present invention; its structure is mainly nano-martensite laths and high dislocation density. According to statistical analysis, the average width of nano-martensite laths is 103nm, see figure ...

Example Embodiment

[0027] Example 2:

[0028] A method for preparing lightweight, high-strength and tough automotive steel using silicon instead of aluminum includes the following steps;

[0029] 1) Weigh the alloy composition, weigh 0.4wt.% C, 5.5wt.% Si, 6.0wt.% Mn, 1.0wt.% Ni, and 0.1wt.% Ti according to the weight percentage of the alloy composition. The balance is Fe;

[0030] 2) Smelting and casting, vacuum smelting and casting the alloy components weighed in step 1) into a casting billet with a thickness of 80mm;

[0031] 3) Hot-rolling, the 80mm thick cast slab is kept at 1250℃ for 2.5h, then hot-rolled at 1150℃, the final rolling temperature is 950℃, hot-rolled to 4mm, the total reduction ratio is 95%, and air-cooled to room temperature Obtain the silicon-substituted aluminum lightweight high-strength automotive steel of the present invention; its structure is mainly nano martensite laths and high dislocation density. According to statistical analysis, the average width of nano martensite lath...

Example Embodiment

[0034] Example 3:

[0035] A method for preparing lightweight, high-strength and tough automotive steel using silicon instead of aluminum includes the following steps;

[0036] 1) Weigh the alloy composition, weigh 0.2wt.% C, 4.8wt.% Si, 5.2wt.% Mn, 0.6wt.% Ni, 0.07wt.% Ti according to the weight percentage of the alloy composition. The balance is Fe;

[0037] 2) Smelting and casting, vacuum smelting and casting the alloy components weighed in step 1) into a casting billet with a thickness of 60mm;

[0038] 3) Hot-rolling, the 60mm thick cast slab is kept at 1230℃ for 2.4h, and then hot-rolled at 1130℃, the final rolling temperature is 950℃, hot-rolled to 2.4mm, the total reduction rate is 96%, and air-cooled to The silicon-substituted aluminum lightweight, high-strength and tough automotive steel of the present invention is obtained at room temperature; its structure is mainly nano martensite laths and high dislocation density. According to statistical analysis, the average width of...

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Abstract

The invention relates to lightweight and high strength and ductility automotive steel using silicon instead of aluminum. An alloy comprises, by weight percentage, 0.1-0.4 wt% of C, 3.5-5.5 wt% of Si,4.0-6.0 wt% of Mn, 0.5-1.0 wt% of Ni, 0.01-0.1 wt% of Ti and the balance Fe. The invention further relates to a preparation method of the lightweight and high strength and ductility automotive steel using silicon instead of aluminum. The preparation method includes the alloy component weighing and taking, smelting, casting and hot rolling procedure. The lightweight and high strength and ductilityautomotive steel using silicon instead of aluminum and the preparation method of the steel are provided. The material has excellent mechanical performance, and is low in production cost and simple inprocess, a series of problems caused by lightweight aluminum are compensated very well, and great application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and relates to a nano-structure microstructure, which uses an alloy system in which silicon is substituted for aluminum to prepare the light-weight, high-strength and tough automobile steel. Background technique [0002] Iron and steel materials are widely used in national defense industry, construction, machinery, shipbuilding, automobiles, home appliances and other industries, and are the material basis for social and economic development; under the current situation, the production of iron and steel materials is facing enormous pressure from energy, resources and the environment; With the development of modern industrial technology and the transformation and upgrading of the national economy, the rapid development of high-rise buildings, long-span bridges, light energy-saving vehicles, advanced rail transit equipment, large-scale marine engineering equipment, high-tech ships, ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/14C22C33/04B21B1/22
CPCB21B1/22B21B2001/225C22C33/04C22C38/02C22C38/04C22C38/08C22C38/14
Inventor 宋成浩孙振忠王皓亮马浩鹏
Owner DONGGUAN UNIV OF TECH
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