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A Method of Orientation Distribution of Bundled Bainite in Steel

A technology of bundled bainite steel and bainite, which is applied in the field of bainite steel and its preparation, can solve the problems of low production efficiency, long isothermal time, difficult application of bundled bainite steel, etc., and improve productivity , medium temperature isothermal time is short, the effect of good mechanical properties

Active Publication Date: 2020-01-17
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the long isothermal time at medium temperature and the low production efficiency, it is difficult to apply BBS steel on a large scale in industry.

Method used

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  • A Method of Orientation Distribution of Bundled Bainite in Steel
  • A Method of Orientation Distribution of Bundled Bainite in Steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The high-carbon silicon-containing steel is smelted with a vacuum induction furnace. The mass percentage of the chemical composition of the high-carbon silicon-containing steel is: C is 0.88wt.%; Si is 1.36wt.%; Mn is 0.38wt.%; Cr is 1.01wt. %; P <0.02wt.%; S <0.02wt.%; the rest is Fe.

[0019] The smelted steel ingot with the above composition content is forged at a high temperature of 1050°C into a plate. The plate is processed into steel with a thickness of 5mm and a length and width of 50mm by wire cutting. The steel was heated to 1000°C for 20 minutes, oil cooled to 240°C for 20 minutes, and then water cooled to room temperature. The tensile strength of the prepared steel is 2100MPa. figure 1 It is a photo of the metallographic structure of the oriented bundled bainite obtained after the high-carbon silicon-containing steel of the present invention is subjected to the above experimental conditions.

Embodiment 2

[0021] The high-carbon silicon-containing steel is smelted with a vacuum induction furnace. The mass percentage of the high-carbon silicon-containing steel is: C is 0.89wt.%; Si is 1.39wt.%; Mn is 0.36wt.%; Cr is 0.96wt. %; P <0.02wt.%; S <0.02wt.%; the rest is Fe.

[0022] The smelted steel ingot with the above-mentioned composition content is forged into a plate at a high temperature of 1080°C. The plate is processed into steel with a thickness of 7mm and a length and width of 50mm by wire cutting. The steel was heated to 1020°C, kept for 30 minutes, oil cooled to 260°C for 30 minutes, and then water cooled to room temperature. The tensile strength of the prepared steel was 1950MPa. figure 2 It is a photo of the metallographic structure of the oriented bundled bainite obtained after the high-carbon silicon-containing steel of the present invention is subjected to the above experimental conditions.

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Abstract

The invention discloses an orientation distribution method for bundle-shaped bainite in steel. The orientation distribution method is characterized in that steel billets smelted by a medium-frequencyvacuum induction furnace are cast into steel ingots, and the steel ingots are forged into boards at a high temperature. Steel is heated to a temperature being 1000-1050 DEG C and is subjected to heatpreservation for 20-30 minutes, is oil-cooled to a temperature being 240-260 DEG C and is subjected to heat preservation for 20-30 minutes, and is water-cooled to the room temperature; steel with orientated distributed bundle-shaped bainite is prepared by temperature gradient fields formed inside steel during cooling, and the steel consists of the following components in percentage by weight: 0.84wt%-0.90wt% of C, 1.34wt%-1.45wt% of Si, 0.35wt%-0.40wt% of Mn, 0.95wt%-1.10wt% of Cr, less than 0.02wt% of P, less than 0.02wt% of S and the balance of Fe. The orientation distribution method has thecharacteristics of low cost, a short period, a simple process, high production efficiency and the like. The prepared bundle-shaped bainite steel has tensile strength of 1700-2100 MPa, and can be applied to the fields such as engineering machinery, roads and bridges.

Description

Technical field [0001] The invention belongs to the technical field of metal materials, and particularly relates to a bainite steel and a preparation method thereof. Background technique [0002] In the 1930s, Bain and Davenprot obtained the bainite structure through intermediate temperature isothermal transformation. Since then, various morphologies of bainite structures have been discovered by scholars from various countries. Greatly promote the practical application of bainitic steel in engineering. In 2002, Bhadeshia et al. obtained bundled bainite by changing the chemical composition of steel, so that the steel material obtained an excellent combination of strength, toughness and ductility, and further aroused people's enthusiasm for low-temperature bainite research. However, because the medium temperature isothermal time is too long and the production efficiency is too low, it is difficult for the bundled bainite steel to be applied on a large scale in industry. Summary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/02C22C38/04C21D8/02C21D1/00C21D6/00
CPCC21D1/00C21D6/002C21D6/005C21D6/008C21D8/0205C21D8/0247C21D2211/002C22C38/02C22C38/04C22C38/18
Inventor 张欣赵旭刘庆锁
Owner TIANJIN UNIVERSITY OF TECHNOLOGY