Super steel reinforced by precipitation of nano intermetallic compound, and preparation method for same

A precipitation-strengthening, nano-metal technology, applied in the field of superalloys, can solve the problems of high cost of power plants, no mechanical properties, and high nickel cost, and achieve the effects of excellent comprehensive performance, good oxidation resistance and cost reduction.

Active Publication Date: 2019-11-05
ZHEJIANG UNIV
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Problems solved by technology

[0007] (2) After adding Al, it is easy to precipitate brittle intermetallic compound phases, such as NiAl, FeAl, etc. Such materials have poor toughness and no good mechanical properties
[0009] However, due to the high cost of nickel, building power plants with Ni-based alloys is expensive compared to stainless steel or other advanced iron-based alloys such as A-286

Method used

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  • Super steel reinforced by precipitation of nano intermetallic compound, and preparation method for same
  • Super steel reinforced by precipitation of nano intermetallic compound, and preparation method for same
  • Super steel reinforced by precipitation of nano intermetallic compound, and preparation method for same

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Embodiment 1～4

[0057] The ratio of alloy raw materials is shown in Table 1, and the specific preparation method includes the following steps:

[0058] (1) Under an Ar gas atmosphere, each alloy element is melted and mixed uniformly according to the composition ratio in Table 1, and the melt is poured into an alloy ingot;

[0059] (2) placing the ingot at 1100°C to 1200°C for a homogenization treatment for not less than 4 hours, and then water quenching;

[0060] (3) After being released from the furnace, it is cold-rolled along the longitudinal direction, and the reduction rate is not less than 60%. No heat treatment required during rolling;

[0061] (4) Subsequent standard heat treatment:

[0062] (a) Recrystallization annealing: keep warm at 900°C to 1100°C for 1 hour, then water cool to room temperature;

[0063] (b) Aging treatment: heat preservation at 700° C. to 800° C. for 4 to 50 hours, then water cool to room temperature.

[0064] Taking iron-based alloy A-286 and nickel-based s...

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Abstract

The invention discloses super steel reinforced by precipitation of a Ni3(Al, Ti) nano intermetallic compound, and a preparation method for the same. The super steel contains, by mass, the ingredient elements including 2%-6% of Al, 25%-35% of Ni, 4%-14% of Cr, 0.1%-3% of Ti, 2%-12% of at least one among elements of Ta, Nb, Mo and W, 0.2% of C0, 0.1% of B0 and the balance being Fe. The super steel disclosed by the invention is an iron-based high temperature alloy with high strength and high ductility, oxidation resistance and good comprehensive properties under high temperatures.

Description

technical field [0001] The invention relates to the technical field of superalloys, in particular to a Ni 3 A super steel strengthened by precipitation of (Al, Ti) nanometer intermetallic compounds and a preparation method thereof. Background technique [0002] At present, traditional austenitic steel can have good creep strength and environmental resistance at 600 °C, so it is widely used in the field of thermal power generation. But as the industry moves toward higher thermal efficiencies in power generation, austenitic steels are increasingly falling short of the industry's needs. Increasing the steam temperature and pressure of thermal power units is an important measure to improve power generation efficiency and reduce greenhouse gas emissions. In order to achieve the goal of low emission and high efficiency, the working temperature of structural alloys for the next generation of large power plants needs to be increased by 50°C to 100°C. [0003] Austenitic steels fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/44C22C38/48C22C38/50C22C38/54C21D8/00C22C33/04
CPCC22C38/06C22C38/50C22C38/48C22C38/44C22C38/54C22C33/04C21D8/005
Inventor 贝红斌李吉学涝浙茱丁青青
Owner ZHEJIANG UNIV
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