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A kind of preparation technology of high-strength high-toughness low-carbon steel

A preparation process, high-strength and high-toughness technology, applied in the field of preparation of high-strength low-carbon steel materials, can solve the problems of high price, inconformity with energy saving, resource saving, and cost increase, so as to improve mechanical properties, save protective gas, reduce wear effect

Active Publication Date: 2015-11-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the tool material of the stirring head, the research on the preparation of ultra-fine-grained high-strength steel materials by friction stir processing has not been reported yet.
For friction stir welding / processing of iron and steel materials under conventional technology, expensive cubic boron nitride and tungsten-based alloys are usually used as tool materials, and shielding gas is required to avoid oxidation during welding / processing, which greatly increases the cost , obviously does not meet the needs of energy conservation and resource conservation

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  • A kind of preparation technology of high-strength high-toughness low-carbon steel

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Effect test

Embodiment 1

[0019] Use 5 mm thick Q345 low-carbon steel plate, its chemical composition contains C0.17%, Si0.35%, Mn1.30%, P0.017%, S0.018% by weight percentage, and the balance is Fe; Strength 350MPa, tensile strength 525MPa. A cermet stirring head with a shoulder diameter of 14 mm is used for friction stir processing. The single-pass processing method is adopted. The width of the single-pass processing area is 5 mm. The tool speed is 400 rpm and the travel speed is 50 mm / min. During the processing The processing area is rapidly cooled with flowing water. The diameter of the outlet of the water pipe used in the cooling process is 4mm, the flow rate is ~4L / min, and the water temperature at the outlet is 20°C. Make the processing temperature in the two-phase zone temperature (about 750°C), and the processing zone obtains ultra-fine ferrite / martensite dual-phase structure, such as figure 1 As shown, the grain size of ferrite is 1~2μm, and the grain size of martensite is about 5μm. Tensile...

Embodiment 2

[0023] Use 5 mm thick Q235A low-carbon steel plate, its chemical composition contains C0.15%, Si0.3%, Mn0.6%, P0.02%, S0.022% by weight percentage, and the balance is Fe. A cermet with a shoulder diameter of 10 mm is used for friction stir processing. The single-pass processing method is adopted, and the width of the single-pass processing area is 4 mm. Processing parameters: the tool speed is 800 rpm, and the travel speed is 200 mm / min. During the processing, the processing area is rapidly cooled with flowing water. The diameter of the water outlet of the water pipe used in the cooling process is 4mm, the flow rate is ~7L / min, and the water temperature at the outlet is about 10°C. Make the processing temperature in the two-phase zone temperature (about 750°C), obtain ultra-fine ferrite / martensite dual-phase structure in the processing zone, the average grain size of ferrite is about 2 μm, and the grain size of martensite It is about 8 μm. The tensile test at room temperature...

Embodiment 3

[0027] Use 5 mm thick ordinary low-carbon steel plate, its chemical composition contains C0.06%, Si0.1%, Mn2.2%, Nb0.05%, V0.07%, Ti0.06%, P0 by weight percentage .005%, S0.008%, and the balance is Fe. A cermet stirring head with a shoulder diameter of 20 mm is used for friction stir processing, and a single-pass processing method is adopted, and the width of the single-pass processing area is 8 mm. During the processing, the processing area is rapidly cooled by flowing water. The diameter of the water outlet of the water pipe used in the cooling process is 4mm, the flow rate is ~10L / min, and the temperature of the water outlet is about 5°C. Under the processing parameters of tool speed of 1000 rpm and travel speed of 400 mm / min, the temperature of the processing process is kept at the temperature of the two-phase zone (about 800°C), and ultra-fine ferrite / martensite dual phase is obtained in the processing zone Structure, the average grain size of ferrite is about 2 μm, and ...

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Abstract

The invention discloses a preparation process of high-strength high-toughness low-carbon steel, belonging to the field of preparation of high-strength low-carbon steel materials. The preparation process is suitable for preparing a high-strength low-carbon steel material, and the prepared high-strength low-carbon steel is excellent in strength and toughness. According to the preparation process, stirring and friction processing are performed by using different heat input parameters, and flowing water is used for quickly cooling a processing zone during processing so as to obtain ultrafine ferrite / martensite dual-phase steel with excellent performance. By adopting the preparation process disclosed by the invention, the mechanical properties of ordinary low-carbon steel can be obviously improved, large-area high-strength low-carbon steel can be obtained through multiple passes of lap stirring and friction processing, and the performance of the steel is superior to that of high-strength low-carbon steel plates of the type produced through an industrial TMCP (thermal mechanical control process).

Description

technical field [0001] The invention relates to the field of preparation of high-strength low-carbon steel materials, in particular to a preparation process of high-strength high-toughness low-carbon steel, which is suitable for the preparation of high-strength low-carbon steel materials. Background technique [0002] In order to meet the requirements of energy saving and resource conservation, iron and steel materials are facing large-scale upgrading and upgrading. Advanced high-strength low-carbon steel (including low-carbon low-alloy steel with a small amount of alloying elements) has become a research hotspot for material researchers in various countries. While greatly improving the strength, in order to expand its application range, the plasticity factor must be considered. Therefore, the industry generally tends to use fine-grain strengthening while using the dual-phase or multi-phase structure produced by phase transformation to improve strength and toughness. The co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02
Inventor 薛鹏王全兆张琪肖伯律马宗义
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI