Preparation method of novel cobalt-free material for high-strength aviation part

Abstract

The invention aims to provide a preparation method of a novel cobalt-free material for a high-strength aviation part. The novel cobalt-free material for the high-strength aviation part comprises, by weight, 16.0%-20.0% of Ni, 4.0%-6.0% of Mo, 2.5%-3.5% of Ti, no more than 0.01% of C, no more than 0.05% of Al, no more than 0.05% of Si, no more than 0.05% of Mn, no more than 0.01% of S, no more than0.05 % of P, no more than 0.01% of O, no more than 0.01% of N, and the balance Fe and inevitable impurities. The novel cobalt-free material has high strength, the tensile strength sigma b is equal toor higher than 2300 MPa, the yield strength sigma 0.2 is equal to or higher than 2200 MPa, delta>=3%, the percentage of area reduction psi is equal to or higher than 20%, the Rockwell hardness HRC is56-59, the impact toughness ak is equal to or higher than 5 J / cm <2>, and the breaking tenacity K1C is equal to or higher than 15 MPa.ml1 / 2. Compared with traditional cobalt-containing maraging steel, consistent tensile strength and yield strength can be achieved, meanwhile, the characteristic of high tenacity of the maraging steel is ensured, consumption of cobalt resources is lowered, the preparation cost is reduced, energy shortages are relieved accordingly, and the application and development of the maraging steel are widened.

Description

technical field [0001] The invention relates to an ultra-high-strength high-toughness steel used in aviation and military parts, in particular to a method for preparing a new cobalt-free material for aviation high-strength parts. Background technique [0002] Maraging steel and its excellent ultra-high strength, high toughness and good comprehensive performance have become the mainstay of high-tech fields such as aviation, aerospace, marine, such as wing girders, carrier-based aircraft landing gear, submarine power plants, etc. The material of choice for corrosion (or medium temperature) parts and impeller materials. So far, maraging steel has been developed into two main categories, namely, 18Ni type cobalt-containing maraging steel and 18Ni type cobalt-free maraging steel (also known as T type), and 18Ni type cobalt-containing maraging steel. The aging steel is based on Ni-Co-Mo-Ti. Due to the precious element Co, the 18Ni type cobalt-containing maraging steel is generall...

AI Technical Summary

Problems solved by technology

[0003] Generally, maraging steel needs to ensure very high purity. High-purity maraging steel can have good high plasticity and high toughness while having high mechanical strength. In order to ensure high Generally, elements such as C, Mn, Si, P, S and O will be reduced. When the content of these elements is too high, the toughness and plasticity of maraging steel will be greatly reduced, that is, the brittleness of maraging steel will be large. , reduced practical performance

In the existing technology, the development and application of 18Ni-type cobalt-containing maraging steel is relatively mature, and its maximum strength reaches 2400 MPa, which can maintain good toughness and plasticity at the same time, while the maximum strength of 18Ni-type cobalt-free maraging steel is only It can reach 2000MPa, which has a huge gap with the mechanical properties of cobalt-containing maraging steel, which limits the application range of cobalt-free maraging steel to a large extent

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