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Twinning induced plasticity alloy steel with columnar crystal structure and preparation method thereof

A twin-induced plasticity and columnar crystal structure technology, applied in the aerospace field, can solve the problems of limited temperature gradient and cooling rate, achieve large plasticity, improve longitudinal mechanical properties, and delay necking

Active Publication Date: 2012-10-03
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0014] The HRS method is cooled by radiation heat exchange, and the temperature gradient and cooling rate that can be obtained are very limited.

Method used

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Experimental program
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Embodiment

[0025] Embodiment: Twin-induced plasticity alloy steel with columnar grain structure, wherein the contents of chemical components are: Mn: 30%, Al: 3%, Si: 2.9%, C: 0.06%, Fe: 64.04%.

[0026] A method for preparing a twin-induced plastic alloy steel with a columnar grain structure, comprising the following steps:

[0027] (1) Smelting: Mix a certain proportion of raw materials such as Mn, Al, Si, C, and Fe, and put them into a vacuum induction smelting furnace for smelting, and the protective atmosphere is argon to obtain a casting with a relatively uniform structure;

[0028] (2) Directional solidification: use smelted castings as raw materials, first select a certain size of material at a suitable casting part, put it into a directional solidification furnace and melt it under the protection of an argon atmosphere, and the preparation temperature is 1500 ° C, and then make the directional solidification The crucible in the solidification furnace is slowly lowered, and the l...

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Abstract

The invention discloses twinning induced plasticity alloy steel with a columnar crystal structure and a preparation method thereof. The preparation method mainly comprises the following steps of: mixing Mn, Al, Si, C and Fe elementary substances in a certain chemical ratio; and performing procedures of smelting, directional solidification and heat treatment. The structure of the alloy steel can be controlled to be columnar crystals, the horizontal crystal boundary is eliminated, the longitudinal mechanical properties of a material is greatly improved, and the mechanical properties of the alloy steel are regulated in a higher level; moreover, twin crystals are continuously formed, so that higher strength and plasticity are achieved; and compared with the traditional alloy steel, the twinning induced plasticity alloy steel has the characteristics of high specific strength, high specific rigidity, high energy absorptivity and the like, and has wide application prospect in various fields.

Description

technical field [0001] The invention relates to a twin-induced plasticity alloy steel with a columnar crystal structure and a preparation method thereof, in particular to a preparation method of a high-strength ultra-high plasticity alloy suitable for aerospace and other fields. Background technique [0002] Twin-induced plasticity alloys continue to form twins during the deformation process, significantly delaying necking, thereby obtaining higher strength and greater plasticity. Compared with traditional alloy steels, they have high specific strength, high specific stiffness and high energy absorption rate. It is a new material with integrated structure and function. As a structural material, it has the characteristics of light weight and high strength; as a functional material, it has the characteristics of efficient energy absorption, and has broad application prospects in many fields. For example, it can be used in bumpers, deep-drawn automotive parts, etc. Due to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06B22D27/04C21D1/40C30B11/00C30B29/52C30B33/02
Inventor 段先锋韩福生汪聃王新福王幸福
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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