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Superfine crystalline pure iron preparation method

A technology of ultra-fine grain and pure iron, which is applied in the preparation field of metal rolling technology, can solve problems such as poor welding, affecting material performance stability, and difficulty in large-scale industrial production, and achieves the effect of improving yield strength

Inactive Publication Date: 2010-01-20
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In addition, the materials prepared by lap-roll welding may have poor welding, resulting in delamination of the material, affecting the stability of material performance and affecting its popularization and application.
Therefore, although this process can prepare ultrafine-grained materials, it is difficult to achieve large-scale industrial production.

Method used

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Embodiment Construction

[0021] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0022] This embodiment includes the following specific steps:

[0023] Include the following steps:

[0024] The first step is to select the material to be rolled, keep it at 900°C for 5 hours, and then cool it down to room temperature with the furnace. Remove the scale on the surface after taking out the material to be rolled;

[0025] The thickness of the material to be rolled is 10mm.

[0026] In the second step, the material to be rolled obtained in the first step is subjected to synchronous rolling at 400° C. to 4 mm; and then asynchronous differential rolling to make a rolled material with a thickness of 1...

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Abstract

A superfine crystalline pure iron preparation method in the metal rolling technical field comprises the following steps: selecting material to be rolled, keeping temperature for 5h at 900 DEG C; performing synchronous rolling and cross shear friction speed rolling; after keeping temperature, performing secondary synchronous rolling at room temperature and obtaining superfine crystalline pure iron. By adopting the solution of in the invention, the superfine grain structure can be prepared through the simple steps, wherein, the particle size is 0.9mu m and the content of high angle grain boundary (theta is not less than 15 DEG C) can reach more than 65%. Uniaxial tensile test shows that the yield strength of the material is improved remarkablely after the cross shear rolling.

Description

technical field [0001] The invention relates to a preparation method in the technical field of metal rolling, in particular to a preparation method of ultrafine-grained pure iron. Background technique [0002] In recent years, ultra-fine-grained materials have aroused great interest among material researchers and industrial circles due to their unique microstructure and excellent mechanical and physical properties, and some industrial applications have appeared. However, from the perspective of industrialization and application, how to reduce industrial costs and prepare ultra-fine-grained bulk materials with excellent performance through a simple and repeatable process is the primary problem in the study of ultra-fine-grained materials. [0003] At present, a variety of processes for preparing ultrafine-grained materials have emerged one after another. Among them, strong deformation processes such as equal-channel angular extrusion and high-pressure torsion are more common...

Claims

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Application Information

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IPC IPC(8): C21D7/00
Inventor 丁毅蒋建华单爱党
Owner SHANGHAI JIAO TONG UNIV
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