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Ultra-high-strength ferritic steel strengthened by nano-intermetallic compound and its manufacturing method

A nano-metal, ultra-high-strength technology, applied in the field of ultra-high-strength ferritic steel and its manufacturing, can solve the problems of low fracture toughness and poor welding performance, and achieve low production cost, excellent strength and toughness, and excellent welding performance and the effect of plasticity

Inactive Publication Date: 2017-04-26
CITY UNIVERSITY OF HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the requirements of modern industry for the weldability, toughness and other comprehensive properties of ultra-high-strength steel are increasing day by day. Higher carbon content leads to poor weldability and low fracture toughness. Replacing carbide strengthening to strengthen ultra-high-strength steel, and effectively exert the positive strengthening effect of trace carbides without destroying the good comprehensive performance

Method used

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  • Ultra-high-strength ferritic steel strengthened by nano-intermetallic compound and its manufacturing method
  • Ultra-high-strength ferritic steel strengthened by nano-intermetallic compound and its manufacturing method
  • Ultra-high-strength ferritic steel strengthened by nano-intermetallic compound and its manufacturing method

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Embodiment 1

[0058] According to the composition range of the ultra-high-strength ferritic steel strengthened by nano-intermetallic compounds of the present invention, inventive steels NIS101-108 were smelted, and comparative steels CS1 and CS2 were smelted at the same time for comparison. According to the alloy composition of the invention steel NIS101-108 and the comparison steel CS1 and CS2 shown in Table 1, smelt and cast in an electric arc melting furnace, and roll the obtained ingot at a reduction of 5-10% each time. After processing, a plate with a total deformation of about 70% is obtained. The rolled plate was solution treated at 900°C for 0.5 hours, then cooled to room temperature by argon quenching, then aged at 550°C for 2 hours, and then cooled to room temperature by argon quenching , thus making the invention steel NIS101-108 and the comparison steel CS1, CS2.

[0059] Table 1. Alloy composition of invention steel NIS101~108 and comparison steel CS1, CS2

[0060]

Embodiment 2

[0062] According to the alloy composition of NIS103 in Table 1, it is smelted and cast in an electric arc melting furnace, and the obtained ingot is rolled at a reduction of 5-10% each time, and the total deformation is about 70%. of plates. The rolled plate was subjected to solution treatment at 1200° C. for 0.2 hours, then cooled to room temperature by water quenching, then aged at 550° C. for 2 hours, and then cooled to room temperature by air cooling. Invention steel NIS103' was thus produced.

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Abstract

A super-high strength ferritic steel reinforced with nano-intermetallics and a manufacturing method thereof. The super-high-strength ferritic steel comprises the following components in percentage by weight: 0-0.2% of C, 2%-15% of Ni, 0-10% of Mn, 0.5-6% of Al, 0-4% of Cu, 0-12% of Cr, 0-3% of Mo, 0-3% of W, 0-0.5% of V, 0-0.5% of Ti, 0-0.5% of Nb, 0-1% of Si, 0.0005-0.05% of B, no more than 0.04% of P,no more than 0.04% of S, no more than 0.04% of N, no more than 0.05% of O, the balance being Fe and other inevitable impurities. These components are subjected to smelting, casting and forging rolling, and then treated with solid solution and aged to form a super-high strength ferritic steel which is mainly reinforced by nano-intermetallics incorporating composite reinforcements of nanoclusters and nano-carbides, obtaining excellent durability, solderability and corrosion resistance.

Description

technical field [0001] The invention relates to an ultra-high-strength ferritic steel and a manufacturing method thereof, in particular to an ultra-high-strength ferritic steel strengthened by nanometer intermetallic compounds and a manufacturing method thereof. Background technique [0002] In recent years, with the rapid development of modern industry and national defense, the application of ultra-high-strength steel in aerospace, national defense, power stations and other high-tech fields is becoming more and more important. Among them, ultra-high-strength steel with a tensile strength of 1400-2000 MPa is an important type of steel with a wide range of applications, especially in areas with special requirements for performance such as rocket engine casings, aircraft landing gear, and bulletproof steel plates. And its scope of use is constantly expanding to construction, machinery manufacturing, vehicles and other military and civilian equipment. [0003] Traditional ultr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C38/16C22C38/54C22C38/58C21D8/00
CPCC21D6/001C21D6/004C21D2211/004C22C38/002C22C38/04C22C38/06C22C38/08C22C38/12C22C38/44C22C38/46C22C38/50C22C38/54
Inventor 刘锦川焦增宝
Owner CITY UNIVERSITY OF HONG KONG