A heat treatment method for high-strength and toughness hot-formed steel sheets for automobiles
A heat treatment method and high-strength toughness technology, which is applied in the field of heat treatment of high-strength and toughness hot-formed steel sheets for automobiles, can solve the problems of poor plasticity and high strength, and achieve the effects of improving elongation, improving toughness, and improving plasticity
Inactive Publication Date: 2011-12-28
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
[0009] The purpose of the present invention is to overcome the disadvantages of high strength but poor plasticity of the steel plate for thermoforming at present, and provide a heat treatment method for high-strength and toughness thermoformed steel plate for automobiles on the basis of traditional thermoforming steel, specifically Through the method of tempering, to eliminate the internal stress and soften the martensitic structure of the hot forming steel during the rapid cooling process, and improve its toughness
Method used
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Embodiment 1
[0026] The hot-formed steel plate was kept at 200 °C for 2 min, and then air-cooled to room temperature, such as figure 1 As shown, the mechanical properties and microstructure are shown in Table 2 and figure 2 (a) shown.
Embodiment 2
[0028] The hot-formed steel plate was kept at 250 °C for 2 min, and then air-cooled to room temperature, such as figure 1 As shown, the mechanical properties and microstructure are shown in Table 2 and figure 2 (b) shown.
Embodiment 3
[0030] The hot-formed steel plate was kept at 300 °C for 2 min, and then air-cooled to room temperature, such as figure 1 As shown, the mechanical properties and microstructure are shown in Table 2 and figure 2 (c) shown.
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The invention provides a heat treatment method for high-strength and toughness hot-formed steel plates for automobiles, which belongs to the technical field of high-strength steels for automobiles, and aims to solve the problems of high strength but poor plasticity of steel plates for hot-formation at present. Technical measures to solve the problem: the mass percentage of the components is: C: 0.2~0.4%, Si: 0.1-0.5%, Mn: 1.0~2.0%, Cr: 0.1~0.5%, B: 0.001-0.005%, Ti : 0.01~0.05%, Al: 0.01-0.1%, P: <0.02%, S: <0.01%, N: <0.01%, and the balance is iron and unavoidable impurities. In the range of ~500℃, tempering treatment is carried out for 1-5min. The invention has the advantages that after the tempering treatment, the plasticity of the hot-formed steel is significantly improved while the strength is slightly reduced, and the toughness of the steel plate after hot stamping is improved.
Description
technical field [0001] The invention belongs to the technical field of high-strength steel for automobiles, and in particular relates to a heat treatment method for high-strength and toughness hot-formed steel sheets for automobiles. The processed steel plates have excellent strength and toughness. Background technique [0002] With the development of the automobile industry, energy saving and emission reduction has become the focus of common attention in the world today. Automobile lightweight is the main measure to achieve this goal. [0003] Usually, ultra-high-strength automotive steel with a tensile strength greater than 1000MPa has a narrow range of plastic deformation due to its high strength, poor formability, and requires a large stamping force. When stamping and deforming at room temperature, it is easy to crack, and the springback of the parts after forming is serious, resulting in poor dimensional and shape stability of the parts, and it is more difficult to st...
Claims
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Login to View More IPC IPC(8): C22C38/38C22C38/32C21D8/02
Inventor 程俊业靳海亮陈银莉苏岚赵爱民唐荻
Owner UNIV OF SCI & TECH BEIJING
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