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

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...

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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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