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Laser tailor-welded high-strength steel warm forming preparation method

A technology of laser tailor welding and warm forming, which is applied in the field of material processing, can solve the problems affecting the welding performance of boron steel, the low plasticity of hot-formed boron steel, and poor mechanical properties, etc., so as to save process costs, reduce forming temperature, and excellent Effect of Mechanical Properties and Surface Quality

Inactive Publication Date: 2017-01-25
DALIAN UNIV OF TECH
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Problems solved by technology

Therefore, the existing problem is: From the perspective of hot forming process, when the heating temperature of 22MnB5 steel exceeds the Ac3 temperature, its oxidation phenomenon is also particularly prominent. Al-Si coating is often used for pre-protection treatment of boron steel. According to the European A Famous automotive steel manufacturing companies such as Celo-Mittal and South Korea’s Posco reported that the existence of Al-Si coatings not only affects the welding performance and final formability of boron steel, but also the coating composition Al is affected by the welding process. The microstructure has a negative impact on the mechanical properties; in addition, after fully austenitized heating and heat preservation, the plasticity of the hot-formed boron steel obtained by quenching is low, and the total elongation of the hot-formed boron steel obtained on the industrial production line is between 6- around 7%

Method used

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  • Laser tailor-welded high-strength steel warm forming preparation method
  • Laser tailor-welded high-strength steel warm forming preparation method
  • Laser tailor-welded high-strength steel warm forming preparation method

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preparation example Construction

[0026] A preparation method for warm forming of high-strength steel by laser tailor welding, comprising the following steps:

[0027]S1. Select 22MnB5 steel plate as Tailored Welded Sheet I, with a thickness between 1.2mm-1.8mm. The chemical composition weight percentage of the 22MnB5 steel plate is: C: 0.21-0.25%; Mn: 1.2-1.4%; Cr: 0.11- 0.25%; Si: 0.2-0.3%; B: 0.002-0.005%; Al: 0.02-0.05%; P≤0.015%; S≤0.005%; the balance is Fe and unavoidable impurities;

[0028] The medium manganese steel plate is selected as the second tailored welded sheet, the thickness is between 1.2mm-1.8mm, and the chemical composition weight percentage of the medium manganese steel plate is: C: 0.05-0.50%; Mn: 4.0-6.0%; P≤0.015% ; S≤0.02%, the balance is Fe and unavoidable impurities; wherein, the 22MnB5 steel plate and the medium manganese steel plate can be of equal thickness or unequal thickness; weight can be added on the basis of the chemical composition of the medium manganese steel plate One ...

Embodiment 1

[0033] 22MnB5 steel and medium manganese steel are selected, and their chemical compositions are respectively by weight percentage:

[0034] 22MnB5 steel is C: 0.225%; Mn: 1.25%; Cr: 0.18%; Si: 0.22%; B: 0.003%; Al: 0.025%; P: 0.013%; S: 0.003%; impurities;

[0035] Medium manganese steel is C: 0.1%; Mn: 5%; P: 0.013%; S: 0.01%; the balance is Fe and unavoidable impurities.

[0036] The preparation method comprises the following steps:

[0037] S1, making the two high-strength steels of the above composition into steel parts for use;

[0038] S2. Perform laser tailor welding on the two steel pieces; in this embodiment, the 22MnB5 steel plate is selected to be 1.5 mm, and the medium manganese steel plate is selected to be 1.2 mm. The size of the two steel plates is 40cm*30cm, the schematic diagram of laser tailor welding, as shown in image 3 shown. When real auto parts are subjected to laser tailor welding and warm forming according to this patent, the dimensions of the t...

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Abstract

The invention discloses a laser tailor-welded high-strength steel warm forming preparation method. The laser tailor-welded high-strength steel warm forming preparation method is characterized by comprising the following steps: manufacturing a 22MnB5 steel plate and a medium manganese steel plate into a steel part for later use; carrying out laser tailor-welded connection treatment; carrying out heating treatment on the steel part for later use, which is subjected to laser tailor-welding; transferring the steel part onto a stamping mold to carry out stamping forming and quenching; finally obtaining a two-phase or three-phase microstructure formed by lots of ferrite, martensite or bainite in the 22MnB5 steel area of the tailor-welded steel part; and obtaining a martensite organization structure in the medium manganese steel area, thereby forming a warm forming technology of the laser tailor-welded high-strength steel, which has no need for coating treatment in advance and has gradient distributed mechanical property. The laser tailor-welded high-strength steel warm forming preparation method has the beneficial effects that the process combination of laser tailor-welding and the warm forming technology is realized; the warming forming technology is used for enabling 22MnB5 steel to form the two-phase or three-phase microstructure; the two-phase or three-phase microstructure is matched with medium manganese steel having martensitic structure in the end to obtain a custom-made warm forming part with gradient distributed performances; the technological process is simplified; and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of material processing, and relates to a warm forming preparation method of laser tailor welding high-strength steel for automobiles. Background technique [0002] In order to meet the technical requirements of automobile lightweight and safety, major automobile manufacturers strive to reduce the weight of automobiles by improving the structural design of automobiles and finding new alternative materials. Automobile steel has also experienced the first generation (including The boron steel mainly used in hot forming technology is 22MnB5, as well as TRIP steel and DP steel suitable for cold forming), the second generation (mainly TWIP steel) to the third generation (including Q&P steel and ultra-fine grain medium manganese steel) development. At the same time, a variety of advanced technologies have been introduced correspondingly in material processing. Laser tailor welding technology is one of them. Laser ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/18C22C38/02C22C38/06C22C38/32C21D1/18B23K26/24B23K26/12
CPCC21D1/18C22C38/02C22C38/04C22C38/06C22C38/18C22C38/32B23K26/1224B23K26/24C21D2211/008C21D2211/002B21D35/006
Inventor 常颖李晓东王存宇赵坤民任大鑫郑国君韩硕王明辉
Owner DALIAN UNIV OF TECH
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