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Rare earth superstrong steel and preparation method thereof

A rare earth and super-strength technology, applied in the field of metallurgy, can solve the problems of high cost of maraging steel, inability to maintain good plasticity at the same time, and restrictions on widespread use, so as to overcome low plasticity, high tensile strength, and reduce use volume effect

Active Publication Date: 2019-02-12
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the large amount of Co element causes the cost of maraging steel to increase greatly, which limits its wide application.
In addition, due to the semi-coherent interface between the precipitated particles and the matrix in traditional maraging steel, large non-uniform distribution of coherent distortion will occur, thereby increasing the tendency of the material to generate cracks during deformation, making the material While the alloy has high strength, it cannot maintain good plasticity at the same time

Method used

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  • Rare earth superstrong steel and preparation method thereof
  • Rare earth superstrong steel and preparation method thereof
  • Rare earth superstrong steel and preparation method thereof

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preparation example Construction

[0038] The present invention provides a preparation method for the rare earth super-strength steel described in the above technical solution, comprising the following steps:

[0039] (1) heat-preserve and forge the billet corresponding to the rare earth super-strength steel component at 1200±15° C., and obtain the billet after air cooling;

[0040] (2) heating the forging billet in the step (1) to 905±15° C. for heat preservation to obtain a billet;

[0041] (3) Perform aging treatment on the billet obtained in the step (2) at 500±50° C. to obtain rare earth super-strength steel.

[0042] In the present invention, the casting slab corresponding to the rare earth super-strength steel component is successively heat-insulated and forged at 1200±15° C., and the forged slab is obtained after air cooling. In the present invention, the cast slab made of the raw materials is preferably prepared by melting first and then pouring. The present invention has no special restrictions on th...

Embodiment 1

[0048] Two-component test steel slabs (see Table 1 for specific alloy composition) were produced by the conventional method of first smelting and then casting, and the slab (the size of the slab was 300×250×50mm) was heated to 1200°C±15°C , after 30 minutes of heat preservation, forging to a thickness of 30mm, and then air cooling to room temperature to obtain a forging billet;

[0049] Heating the forging billet to 900°C, keeping it warm for 2 hours, and then cooling it with water to obtain a billet;

[0050] Cut out a sample with a size of 20×20×130 mm from the billet, heat the sample to 500° C. and then perform aging heat treatment, and air cool to room temperature after the aging heat treatment.

[0051] Alloy composition of table 1 test steel (wt.%)

[0052] serial number

Ni

Al

Mo

Nb

C

B

mn

W

La

Ce

Fe

1# test steel

15.332

2.619

0.059

0.763

0.026

0.017

3.394

0.182

0.008

0

margin

...

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Abstract

The invention belongs to the technical field of metallurgy and particularly relates to rare earth superstrong steel and a preparation method thereof. According to the rare earth superstrong steel andthe preparation method thereof, a micro amount of rare earth element is added in maraging steel, the using amount of Ni is reduced, Co for use is eliminated, and cost is remarkably lowered. The tensile strength of the rare earth superstrong steel obtained due to the preparation method is not lower than 2000 MPa under the room temperature of (20 DEG C), the extending rate is not lower than 9%, hightensile strength and excellent toughness are achieved, and the problem that traditional maraging steel is high in strength, but low in plasticity is solved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a rare-earth super-strength steel and a preparation method thereof. Background technique [0002] Maraging steel is based on carbon-free or low-carbon iron-nickel martensite. After aging heat treatment at about 500°C, it produces high-strength steel that is strengthened by the precipitation of intermetallic compounds. It is widely used in military industry, aviation, aerospace and atomic energy. and other fields. It mainly includes three typical series of 18Ni, 20Ni and 25Ni, among which the manufacturing process of the 18Ni series is the easiest and the most widely used. Maraging steel mainly realizes the ultra-high strength of the alloy through the combination of solid solution strengthening, phase transformation strengthening and aging strengthening, among which the aging strengthening effect makes the greatest contribution to the strength. Typical maraging steels, such a...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C22C38/08C22C38/12C21D8/00C21D6/00
CPCC21D6/001C21D6/005C21D8/005C21D2211/008C22C38/005C22C38/04C22C38/06C22C38/08C22C38/12
Inventor 王海燕高雪云姚兆凤陈树明梁梦斐高添
Owner INNER MONGOLIA UNIV OF SCI & TECH
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