Co-free composite strengthened secondary hardened ultra-high strength steel and preparation method

An ultra-high-strength steel, secondary hardening technology, applied in the field of alloy steel, can solve the problems of reducing Co content, being vulnerable to the impact of the international situation, poor economy, etc., to achieve saving Co element content, high economy, ultra-high strength Effect

Active Publication Date: 2018-07-06
CENT IRON & STEEL RES INST
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Problems solved by technology

[0012] Although the AerMet series materials have excellent performance, due to the large amount of precious alloy elements such as cobalt and nickel, there are problems such as poor economy. Although M54 tries to solve the economic problems of the AerMet series materials, it relies on relatively high compound addition of W and Mo to obtain corresponding precipitation. The driving force and the strengthening effect reduce the Co content, but still contain up to 7% of the Co element, especially for Co as a strategic resource, which is extremely vulnerable to the impact of the international situation

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  • Co-free composite strengthened secondary hardened ultra-high strength steel and preparation method
  • Co-free composite strengthened secondary hardened ultra-high strength steel and preparation method

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Embodiment Construction

[0040] According to the chemical composition scope of steel of the present invention, adopt 25 kilograms of vacuum induction furnaces to prepare 10 furnaces of alloy ingots of 21 kilograms, its concrete chemical composition is shown in Table 3, and furnace number is 1 # ~15 # .

[0041] After the 15 furnace steel is smelted and cast into steel ingots, the high temperature homogenization treatment system is carried out before forging: 1200°C for 10 hours, then cooling for forging, the forging heating temperature is 1150°C. The dimensions of forged test rods are: φ15×2000mm, 15×15×2000mm and 25×45×L.

[0042] After forging, the test bar is firstly subjected to normalizing and annealing heat treatment: normalizing treatment at 1050°C×1h, air cooling, annealing treatment at 680°C×6h, and air cooling. Then send the sample section to process the tensile, impact and fracture toughness sample blanks. The final heat treatment is quenching, deep cooling and tempering heat treatment: ...

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Abstract

The invention discloses Co-free composite reinforced secondary hardening ultrahigh-strength steel and a preparing method and belongs to the technical field of alloy steel. The Co-free composite reinforced secondary hardening ultrahigh-strength steel comprises, by weight, 0.20-0.50% of C, 1.0-5.0% of Cr, 10.0-30.0% of Ni, 0.50-3.0% of Al, 1.0-5.0% of Mo, 2.0% of W or less, 0.30% of V or less, 0.20% of Nb or less, and the balance Fe and unavoidable impurities. The vacuum induction technology, the vacuum arc remelting or vacuum induction technology and the electroslag remelting technology can be adopted in the alloy. Compared with the prior art, the Co-free composite reinforced secondary hardening ultrahigh-strength steel has the beneficial effects that the comprehensive performance is good, ultrahigh strength and good ductility and toughness are achieved, the heat treatment technology is superior in performance, high temper resistance and overaging resisting capability are achieved, the content of the strategic resource of the Co element is saved, and the economical efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, in particular to an economical Co-free compound strengthened secondary hardening ultra-high strength steel Air360 and its preparation method, which has good comprehensive performance, high tensile strength and good plastic toughness, and excellent heat treatment process performance , has high tempering stability and anti-aging ability, saves the strategic element Co, and is economical. Background technique [0002] With the development of the aviation and aerospace industry, especially after the durability / damage tolerance design criteria are adopted for aerospace components, higher requirements are put forward for materials, which require materials to have higher strength, toughness and reasonable yield / strength ratio. Especially for the development of new aircraft, there is an increasingly urgent demand for ultra-high-strength steels of 2000 MPa and above that can be used for durability dam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48C22C38/46C22C38/44C22C33/04C21D1/18C21D6/04
Inventor 王春旭厉勇赵博赵志国黄顺喆韩顺刘少尊邢峰刘宪民许广兴景绿露赵世春楼瑞祥李建新庞学东
Owner CENT IRON & STEEL RES INST
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