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Cu strengthened co-free secondary hardening 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 the Co content, poor economy, and the price is vulnerable to the impact of the international situation, and achieves the saving of Co element content, high economy, and good heat treatment. crafted effect

Active Publication Date: 2017-12-26
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 alloying 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 W and Mo compound additions to obtain corresponding precipitation. The driving force and strengthening effect reduce the Co content, but still contain up to 7% Co element, especially for Co as a strategic resource, the price is very vulnerable to the impact of the international situation

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  • Cu strengthened co-free secondary hardening ultra-high strength steel and preparation method

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Embodiment Construction

[0041] According to the chemical composition scope of steel of the present invention, adopt 25 kilograms of vacuum induction furnaces to prepare 21 kilograms of alloy ingots, its concrete chemical composition is shown in Table 3, and furnace number is 1 # ~13 # .

[0042] After 13 batches of steel were smelted and cast into steel ingots, the high-temperature homogenization treatment system was first carried out before forging: after holding at 1200°C for 10 hours, the temperature was lowered for forging, and the forging heating temperature was 1150°C. The dimensions of forged test rods are: φ15×2000mm, 15×15×2000mm and 25×45×L.

[0043] 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 ...

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Abstract

A Cu-strengthened Co-free secondary hardening ultra-high strength steel and a preparation method thereof belong to the technical field of alloy steel. The chemical composition weight percentage of the port is: C 0.20‑0.50%, Cr 1.0‑5.0%, Ni8.00‑30.0%, Mo 1.0‑5.0%, Cu 1.0‑5.0%, Al 0‑3.0%, W 0‑2.0 %, V≤0.30%, Nb≤0.20%, the balance is Fe and unavoidable impurities. The preparation method can adopt vacuum induction + vacuum consumable remelting or vacuum induction + electroslag remelting smelting process. The advantage is that compared with the existing technology, the comprehensive performance is good, it has higher strength and good plastic toughness, excellent heat treatment process performance, higher tempering stability and overaging resistance, and saves the content of Co element in strategic resources, significantly Improved economy.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, in particular to a Cu-strengthened Co-free secondary hardening ultra-high-strength steel Air350 and its preparation method. With the strategic element Co, the economy is strong. 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 , and economical, suitable for mass production and application. With 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 damage tolerance design. The latest application achievement is AerMet100 steel in the United States, an ultra-high-strength steel that adopts secondary hardeni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/46C22C38/48C21D8/00
Inventor 王春旭厉勇刘少尊黄顺喆韩顺邢峰刘宪民田志凌赵博赵志国李建新庞学东
Owner CENT IRON & STEEL RES INST
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