Low-carbon low-alloy steel superplastic material and preparation method thereof

A technology of low-alloy steel and superplasticity, which is applied in the field of superplastic material preparation, can solve problems such as complex preparation process, achieve simple implementation process, improve production and manufacturing efficiency, and realize the effect of simple process

Pending Publication Date: 2021-12-24
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a low-carbon low-alloy steel superplastic material and a preparation method thereof, so as to solve the problem of complex preparation process of the current low-carbon low-alloy steel superplastic material

Method used

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  • Low-carbon low-alloy steel superplastic material and preparation method thereof
  • Low-carbon low-alloy steel superplastic material and preparation method thereof
  • Low-carbon low-alloy steel superplastic material and preparation method thereof

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preparation example Construction

[0042] A kind of preparation method of low-carbon low-alloy steel superplastic material provided by the invention, preparation method comprises the following steps:

[0043] Step 1, smelting the low-carbon and low-alloy steel. During the smelting process, mold casting is used to produce ingots or continuous casting is used to produce continuous casting slabs. In the smelting process, converters, electric furnaces and induction furnaces can be used for smelting.

[0044] Step 2: rolling the cast ingot or continuous casting billet into shape, and obtaining a billet with lamellar or lath-like structure after cooling, and obtaining a ferrite-austenite dual-phase structure after the billet is annealed.

[0045] In a specific embodiment of the present invention, the rolling forming includes hot rolling or cold rolling, and the rolling deformation is more than 30%; if the rolling deformation is too small, the structure formed during the high-temperature tensile deformation process wi...

Embodiment 1

[0053] Preparation of 0.1C5Mn2Al Steel Superplastic Material

[0054] The 0.1C5Mn2Al steel means that according to the mass percentage, the C element content is 0.1%, the Mn element content is 5%, and the Al element content is 2%.

[0055] A method for preparing a low-carbon low-alloy steel superplastic material provided in this embodiment comprises the following steps:

[0056] First, smelt, cast and forge a billet with a thickness of 30mm and a composition of 0.1C5Mn2Al using a 50kg vacuum induction furnace in the raw material laboratory, and then heat it through 4 passes (30-24-20-15-12mm) after holding it at 1200°C for 2 hours. After rolling to a thickness of 12mm, air cool to room temperature to form ferrite and martensite structures such as figure 2 Shown in (a). The amount of deformation after rolling was 60%.

[0057] The specimens were then machined to standard tensile specimen dimensions, which were heated to different temperatures for 10 -3 / s tensile rate for ...

Embodiment 2

[0060] Preparation of 0.05C5Mn2Al Steel Superplastic Material

[0061] 0.05C5Mn2Al steel means that according to mass percentage, the C element content is 0.05%, the Mn element content is 5%, and the Al element content is 2%.

[0062] A method for preparing a low-carbon low-alloy steel superplastic material provided in this embodiment comprises the following steps:

[0063] First, smelt, cast and forge a billet with a thickness of 30mm and a composition of 0.05C5Mn2Al using a 50kg vacuum induction furnace in the raw material laboratory, and then heat it through 4 passes (30-24-20-15-12mm) after holding it at 1200°C for 2 hours. Air-cool to room temperature after rolling to 12 mm; deformation after rolling is 60%. Lamellar ferrite and martensite two-phase alternate structure formed after hot rolling, such as image 3 shown. The specimens were then machined to standard tensile specimen dimensions, which were heated to different temperatures for 10 -2 / s tensile rate for supe...

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Abstract

The invention provides a low-carbon low-alloy steel superplastic material and a preparation method thereof. The preparation method comprises the following steps of: step 1, smelting low-carbon low-alloy steel, and producing a cast ingot by die casting or producing a continuous casting billet by continuous casting in the smelting process; step 2, rolling and forming the cast ingot or the continuous casting blank, and conducting cooling to obtain a lamellar or lath-shaped tissue blank; and step 3, annealing the rolled and formed blank, and quickly stretching the blank at a high temperature to enable the elongation to reach 100% or above, and achieving the superplasticity of the low-carbon low-alloy steel. For the low-carbon low-alloy steel superplastic material and the preparation method disclosed by the invention, the maximum strain rate of the implemented superplastic process is 10 <-2 >/s and is increased by 102 orders of magnitude compared with that of an existing superplastic process, so that the production and manufacturing efficiency of large complex parts can be greatly improved, the production cost is saved, and welding application is greatly lowered.

Description

technical field [0001] The invention belongs to the technical field of superplastic material preparation, and in particular relates to a low-carbon low-alloy steel superplastic material and a preparation method thereof. Background technique [0002] Superplastic materials have exceptionally good plasticity and extremely low flow stress (superplastic forming) in the superplastic state, and generally have an elongation rate of more than 100%, which is especially suitable for the production of large parts with complex shapes and large deformations. Through the one-time forming of the superplastic properties of the material, the connection process of parts can be reduced, which can save manufacturing costs, reduce welding applications and related implementation process problems, so superplastic materials have been widely used in many fields of industrial production. [0003] At present, the preparation methods of materials with superplastic characteristics are mainly concentrate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/13C21D8/00C22C38/04C22C38/06C21D1/26C21D6/00
CPCC21D7/13C21D8/005C21D6/005C21D1/26C22C38/04C22C38/06C21D2211/005C21D2211/001
Inventor 王昌张淑兰张超曹文全张晓丹徐李军徐海峰王辉李碧波
Owner CENT IRON & STEEL RES INST
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