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Method for preparing secondary hardening ultrahigh-strength steel through SPS (Spark Plasma Sintering) sintering and deformation

An ultra-high-strength steel and secondary hardening technology, applied in the field of steel material preparation

Active Publication Date: 2021-04-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the papers and patents on the preparation of secondary hardened ultra-high strength steel by SPS have not been reported yet.

Method used

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  • Method for preparing secondary hardening ultrahigh-strength steel through SPS (Spark Plasma Sintering) sintering and deformation
  • Method for preparing secondary hardening ultrahigh-strength steel through SPS (Spark Plasma Sintering) sintering and deformation
  • Method for preparing secondary hardening ultrahigh-strength steel through SPS (Spark Plasma Sintering) sintering and deformation

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) High-pressure and low-temperature preforming: 30g of Ferrium M54 steel powder was placed in a cemented carbide mold with an inner diameter of 20mm, and discharge plasma high-pressure and low-temperature preforming was performed in SPS equipment.

[0042] The specific parameters are: raise the temperature to 500°C at a heating rate of 100°C / min, and keep it at this temperature for 1min, and the axial pressure is 300MPa. Formed compact.

[0043] (2) Low-pressure high-temperature sintering: use 400-mesh SiC sandpaper to grind the preformed compact obtained in step (1) around, remove the graphite paper on the surface of the compact, and then place it in a graphite mold with an inner diameter of 20mm, and carry out in SPS equipment Low pressure high temperature sintering.

[0044] The specific sintering parameters are: raise the temperature at a heating rate of 100°C / min to make the sintering temperature reach 1050°C, and keep it at this temperature for 10 minutes. At t...

Embodiment 2

[0052] (1) High-pressure and low-temperature preforming: 30g of Ferrium M54 steel powder was placed in a cemented carbide mold with an inner diameter of 20mm, and discharge plasma high-pressure and low-temperature preforming was performed in SPS equipment.

[0053] The specific parameters are: heat up to 600°C at a heating rate of 100°C / min, and hold at this temperature for 2 minutes, and the axial pressure is 500MPa. Formed compact.

[0054] (2) Low-pressure high-temperature sintering: use 400 mesh SiC sandpaper to grind the preformed compact obtained in step (1) around, remove the graphite paper on the surface layer of the compact, and then place it in a graphite mold with an inner diameter of 20mm, and carry out in SPS equipment Low pressure high temperature sintering.

[0055] The specific sintering parameters are: heat up at a heating rate of 100°C / min to make the sintering temperature reach 1100°C, and keep it at this temperature for 15 minutes. At this time, the axial ...

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Abstract

The invention relates to a method for preparing secondary hardening ultrahigh-strength steel through SPS (Spark Plasma Sintering) sintering and deformation and belongs to the technical field of steel and iron material preparation. The method comprises the following steps that secondary hardening ultrahigh-strength steel powder is placed in an alloy mold, and discharge plasma high-pressure low-temperature preforming is carried out on SPS equipment to obtain a preformed pressed blank; then the preformed pressed blank is arranged in a graphite mold, and low-pressure high-temperature sintering is carried out on the SPS equipment to obtain a sintered blank; and finally, the sintered blank is placed in the center of the graphite mold, and high-temperature compression deformation is carried out on the SPS equipment to obtain a secondary hardening ultrahigh-strength steel blank. According to the method, the secondary hardening ultrahigh-strength steel is prepared by adopting discharge plasma sintering-discharge plasma deformation, the operation is simple, the energy consumption is low, the secondary hardening ultrahigh-strength steel with ultrahigh strength and good toughness can be directly obtained, and the subsequent complex heat treatment process is effectively avoided.

Description

technical field [0001] The invention relates to a method for preparing secondary hardened ultra-high-strength steel using SPS sintering and deformation. The method combines discharge plasma sintering-discharge plasma deformation to prepare secondary hardened ultra-high-strength steel, which belongs to the technical field of steel material preparation . Background technique [0002] Secondary hardening ultra-high-strength steel is a kind of metal structural material with broad research and application prospects. It is widely used due to its ultra-high strength, high fracture toughness, high fatigue strength, and high strength and fracture toughness matching. Key components such as rocket engine shells, landing gear of fighter jets and carrier-based aircraft, and bulletproof armor in aviation and aerospace manufacturing industries and military equipment. Typical secondary hardening ultra-high strength steels include HY180, AF1410, AerMet100 and Ferrium M54 steel recently deve...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F3/24
CPCB22F3/105B22F3/1017B22F3/24
Inventor 张朝晖李先雨程兴旺霍国敬王浩宋奇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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