Fe-Ni base precipitation-strengthened austenite alloy and preparation method thereof

Abstract

The invention relates to the field of precipitation-strengthened austenite alloys, in particular to a Fe-Ni base precipitation-enhanced austenite alloy and a preparation method. The austenite alloy comprises the following elements in percentage by mass: 27 to 32 percent of nickel, 13 to 17 percent of chromium, 0.5 to 2 percent of molybdenum, 1.5 to 3 percent of titanium, 0.1 to 0.5 percent of aluminum, 0.1 to 0.6 percent of vanadium, 0.1 to 0.6 percent of silicon, 0.0005 to 0.02 percent of boron, less than 0.02 percent of carbon and the balance of iron and inevitable impurities. In the invention, the Fe-Ni alloy is taken as base, the content of the element boron in the alloy is improved, appropriate hot machining, and thermal treatment and hot hydrogen filling processes are performed, so that the crystal boundary precipitated phase of the alloy is controlled under a reasonable thermal treatment rule, and high mechanical property and high hydrogen damage resistance of a prepared alloy material are ensured. The precipitation-enhanced austenite alloy can be applied to hydrogen close environments of industries with high requirements such as aviation, nuclear energy, petrochemical industry and the like.

Description

Technical field: [0001] The invention relates to the field of precipitation-strengthened austenitic alloys, in particular to a Fe-Ni-based precipitation-strengthened austenitic alloy and a preparation method thereof. content, combined with certain thermal processing and heat treatment processes, can reduce the hydrogen damage of the alloy and improve the hydrogen damage resistance of the alloy. Background technique: [0002] Hydrogen energy is considered to be an important secondary energy source in the new century due to its clean combustion products, high combustion efficiency, and regeneration. The development and utilization of hydrogen energy has attracted widespread attention. However, in many harsh hydrogen environments, materials Problems such as damage and service life decline have been paid more and more attention by people. Some single-phase austenitic alloys have good hydrogen resistance, but their low strength limits their application range. Fe-Ni based precip...

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Problems solved by technology

[0002] Hydrogen energy is considered to be an important secondary energy source in the new century due to its clean combustion products, high combustion efficiency, and regeneration. The development and utilization of hydrogen energy has attracted widespread attention. However, in many harsh hydrogen environments, materials Problems such as damage and service life decline have been paid more and more attention by people.

Some single-phase austenitic alloys have good hydrogen resistance, but their low strength limits their application range

Fe-Ni based precipitation-strengthened austenitic alloys have high yield strength and good plasticity, and are widely used in harsh hydrogen-facing environments, but their resistance to hydrogen damage is significantly lower than that of single-phase austenitic alloys, which affects this type of alloy. Alloys are widely used in many fields as anti-hydrogen embrittlement materials, and the hydrogen damage resistance of alloys needs to be further improved

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