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High product of strength and elongation alloy steel in columnar crystal/isometric crystal composite crystal structure and preparation method thereof

A composite crystal and high-strength plastic product technology, which is applied in the field of microstructure and performance control of high-strength plastic product alloy steel, can solve problems such as inability to achieve strength and plasticity, and limited control range, so as to increase strength, improve axial plasticity, and high-strength Plasticizing effect

Active Publication Date: 2014-06-18
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Due to the limitation of plastic deformation and strengthening mechanism, these methods have a very limited control range for the strength and plasticity of materials, and it is not yet possible to achieve both strength and plasticity.

Method used

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  • High product of strength and elongation alloy steel in columnar crystal/isometric crystal composite crystal structure and preparation method thereof
  • High product of strength and elongation alloy steel in columnar crystal/isometric crystal composite crystal structure and preparation method thereof
  • High product of strength and elongation alloy steel in columnar crystal/isometric crystal composite crystal structure and preparation method thereof

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Experimental program
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Embodiment

[0021] Example: a high-strength plastic alloy steel with a columnar crystal / equiaxed crystal composite crystal structure, its main chemical composition is (wt%): Mn29.5, Al2.75, Si3.10, C0.05, and the rest is Fe.

[0022] The preparation method is as follows:

[0023] (1) Dosing according to the target ingredients, smelting in a vacuum induction furnace under the protection of argon, and pouring into ingots after smelting;

[0024] (2) The amount of turning on the surface of the steel ingot is 2mm, and the size of the forging billet is 40×40×600mm;

[0025] (3) Melt the processed billet in a directional solidification furnace under argon protection, the melting temperature is 1500°C, the crucible descending speed is 2mm / min during directional solidification, and the temperature gradient in the solidification area is 30°C / cm;

[0026] (4) Cut the directionally solidified billet into plates with a size of 40×10×500mm, and then carry out drawing deformation along the columnar cr...

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Abstract

The invention discloses a high product of strength and elongation alloy steel in a columnar crystal / isometric crystal composite crystal structure and a preparation method thereof. The alloy steel is composed of the following chemical components by mass percent: 25-35 of Mn, 2.5-3.5 of Al, 2.7-3.4 of Si, 0.05-0.50 of C, and the balance of Fe. The formation principle of the complex tissue is as follows: growing a certain amount of isometric crystals on the basis of directionally solidified and formed columnar crystal tissue through plastic deformation and recrystallization annealing, wherein the columnar crystal is in favor of improving the axial plasticity, and the isometric crystal is in favor of improving the whole intensity of the material so as to simultaneously improve the material strength and the plasticity; the specific value can regulated by changing a relative number of two crystal tissues. Compared with the normal isometric crystal product of strength and elongation alloy steel, the material obtained by virtue of the preparation method disclosed by the invention can be simultaneously provided with high strength and plasticity and high product of strength and elongation.

Description

technical field [0001] The invention relates to a method for controlling the structure and performance of high-strength plastic-laden alloy steel. A single columnar crystal structure is obtained through directional solidification, and then a part of equiaxed crystals are grown through deformation heat treatment. By changing the relative number of columnar crystals / equiaxed crystals, the strength and elongation of the material can be changed to realize the regulation of the mechanical properties of the material. Background technique [0002] High-strength plastic-deposited alloy steel or twin-induced plasticity steel is a single-phase austenitic steel. Due to its moderate stacking fault energy, twins can continue to form and grow gradually during plastic deformation, resulting in continuous strain hardening effect. The localization of deformation is significantly delayed, thus showing extremely high plasticity, moderate strength and excellent energy absorption ability. It is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C33/04C21D8/02
Inventor 韩福生汪聃王坤
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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