A kind of high-temperature high-strength low-carbon martensitic hot-strength steel and its preparation method

A technology of low-carbon martensite and heat-strength steel, which is applied in the field of aero-engines, can solve problems such as working temperature limit, difficulty in meeting the strength and safety requirements of load-bearing components, and insufficient high-temperature strength, so as to achieve high temperature resistance and improve application stability The effect of avoiding the precipitation of delta ferrite

Active Publication Date: 2021-04-09
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although GX-8 heat-strength steel has high strength and high toughness, the working temperature is limited to a maximum of 600°C
With the continuous increase of the thrust of modern advanced aero-engines, the service temperature of aero-engine suspensions and other load-bearing components can reach above 600°C. The tensile strength at 700°C is only about 200MPa, which is difficult to meet the strength and safety requirements of load-bearing components

Method used

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  • A kind of high-temperature high-strength low-carbon martensitic hot-strength steel and its preparation method
  • A kind of high-temperature high-strength low-carbon martensitic hot-strength steel and its preparation method
  • A kind of high-temperature high-strength low-carbon martensitic hot-strength steel and its preparation method

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Experimental program
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preparation example Construction

[0062] The present invention also provides a method for preparing high-temperature, high-strength, low-carbon martensitic heat-strength steel according to any of the above-mentioned embodiments, comprising the following steps:

[0063] Smelting steps: Prepare raw materials according to the following mass percentages:

[0064] C: 0.10~0.25wt%, Cr: 10.0~13.0wt%, Ni: 2.0~3.2wt%, Mo: 1.50~2.50wt%, Si≤0.60wt%, Mn≤0.60wt%, W: 0.4~0.8wt% %, V: 0.1-0.5wt%, Co: 0.3-0.6wt%, Al: 0.3-1.0wt%, Nb: 0.01-0.2wt%, the rest is Fe, and then the raw materials are smelted to obtain a smelted billet.

[0065] The process of raw material smelting is well known to those skilled in the art, and the present invention is not particularly limited. For example, the method of vacuum induction melting + electroslag remelting (ESR) can be used, and electric arc furnace (EAF) + refining (LF) can also be used. + Vacuum degassing (VD) + Electroslag remelting (ESR) and other smelting methods that can guarantee t...

Embodiment 1

[0086]

[0087] Prepare raw materials by the following mass percentages:

[0088] C: 0.14wt%, Cr: 10.3wt%, Ni: 2.05wt%, Mo: 1.55wt%, Si: 0.35wt%, Mn: 0.31wt%, W: 0.42wt%, V: 0.16wt%, Nb: 0.08wt%, Co: 0.3wt%, Al: 0.28wt%, and the rest is Fe, and the raw materials are smelted to obtain a smelted billet.

[0089]

[0090] For the forging of the smelted slab, the initial forging temperature is 1100°C, and the final forging temperature is 880°C to obtain steel ingots.

[0091]

[0092] Carry out normalizing treatment to the steel ingot, the normalizing treatment temperature is 1100 ℃, the holding time is 3h, and then air-cooled to room temperature.

[0093]

[0094] Heat the heat-treated ingot to 1150°C in a high-temperature furnace for 2 hours, then water-cool it to room temperature, then heat it to 580°C and temper it for 2 hours, then cool it to room temperature, and heat the tempered steel ingot at 480°C for 6 hours. Then cool to room temperature.

Embodiment 2

[0096]

[0097] Prepare raw materials by the following mass percentages:

[0098] C: 0.18wt%, Cr: 12.8wt%, Ni: 2.53wt%, Mo: 2.44wt%, Si: 0.4wt%, Mn: 0.51wt%, W: 0.38wt%, V: 0.23wt%, Nb: 0.12wt%, Co: 0.33wt%, Al: 0.31wt%, and the rest is Fe. The raw materials are smelted to obtain a smelted billet.

[0099]

[0100] For smelting slab forging, the initial forging temperature is 1100°C and the final forging temperature is 860°C to obtain steel ingots.

[0101]

[0102] The steel ingot is annealed at 900°C, held for 8 hours, then cooled to 520°C with the furnace, and then air-cooled to room temperature.

[0103]

[0104] Heat the heat-treated ingot to 1200°C in a high-temperature furnace for 1 hour, then water-cool it to room temperature, then heat it to 600°C and temper it for 2 hours, then cool it to room temperature, and then heat the tempered steel ingot at 500°C for 4 hours. Then cool to room temperature.

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Abstract

The invention provides a high-temperature, high-strength, low-carbon martensitic heat-strength steel and a preparation method thereof, wherein the chemical composition mass percentages of the low-carbon martensitic heat-strength steel are: C: 0.10-0.25 wt%, Cr: 10.0-13.0 wt%, Ni: 2.0~3.2wt%, Mo: 1.50~2.50wt%, Si≤0.60wt%, Mn≤0.60wt%, W: 0.4~0.8wt%, V: 0.1~0.5wt%, Co: 0.3 ~0.6wt%, Al: 0.3~1.0wt%, Nb: 0.01~0.2wt%, the rest is Fe, and the rest is Fe. The heat-strength steel of the present invention realizes high-temperature strengthening by simultaneously precipitating nano-coherent carbides and intermetallic compounds, With excellent toughness, it can be used for some structural parts in special working conditions such as aero-engines, so as to improve its service life and service temperature.

Description

technical field [0001] The invention relates to the technical field of aero-engines, in particular to a high-temperature, high-strength, low-carbon martensitic heat-strength steel and a preparation method thereof. Background technique [0002] The aero-engine is one of the precise mechanical structures in the aircraft. Since the aero-engine is usually in complex working conditions, in order to meet the safety of the flight, its reliability requirements are very high. Among them, the aero-engine suspension is a kind of aero-engine Structural parts are used to carry aero-engines, which are often in harsh working environments such as high temperature, humidity, high stress and corrosive media, which affects the high-temperature strength, toughness and corrosion resistance of structural parts used in special working conditions such as aero-engine suspension Performance and other performance have higher requirements. [0003] The steel commonly used for aero-engine structural pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/02C22C38/04C22C38/46C22C38/52C22C38/48C22C38/06C21D1/26C21D1/28C21D1/18C21D8/00
CPCC21D1/18C21D1/26C21D1/28C21D8/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/52
Inventor 黄进峰张津赵超张诚连勇李建强张程
Owner UNIV OF SCI & TECH BEIJING
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