A kind of ultra-high strength steel with near-net shape and its preparation method

An ultra-high-strength steel, near-net-shape technology, applied in the field of high-strength steel manufacturing, can solve the problems of affecting the surface quality of parts, unable to meet near-net-shape, low precision of formed parts, etc., to improve the forming qualification rate, excellent near-net shape Forming, the effect of mechanical properties
CN108950411BActive Publication Date: 2020-05-19NANJING INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING INST OF TECH
Publication Date
2020-05-19

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Abstract

The invention discloses ultrahigh-strength steel with a near net shaping function and a preparation method thereof, and belongs to the technical field of manufacturing of ultrahigh-strength steel. Thepreparation method comprises the steps of S1, material preparation; S2, alloy smelting; S3, performance heat treatment, specifically, an alloy ingot obtained in step S2 is placed in a heat treatmentfurnace so as to be subject to performance heat treatment, and according to the specific process of performance heat treatment, heat preservation is conducted for 12-24 h at the temperature of 900-1150 DEGC, then the alloy ingot is cooled to the temperature of 500-750 DEGC with the furnace and then is maintained at the temperature of 5-10 h, and finally, the alloy ingot is air-cooled to the room temperature; and S4, pressure processing of alloy. Compared with similar materials, the ultrahigh-strength steel having the near net shaping function and prepared through the process has the advantagesof excellent mechanical property and near net shaping function.
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Description

technical field

[0001] The invention relates to an ultra-high-strength steel with near-net shape and a preparation method thereof, belonging to the technical field of high-strength steel manufacturing. Background technique

[0002] The core of the manufacture of ultra-high-strength steel automotive safety components lies in hot stamping technology. Hot stamping forming technology is an ideal ultra-high-strength steel sheet forming method that can achieve small loads, large deformations, and eliminate springback effects. This technology pre-austenizes the sheet metal before stamping processing, and quenching during the stamping process, so that the steel forms a martensitic structure after forming, and realizes the precise forming and strengthening of ultra-high-strength steel plates. However, the hot stamping process is complicated, the temperature sensitivity of sheet metal forming is large, and the sheet metal is easy to crack. Under different parameter conditions, the c...

Claims

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