High-temperature alloy for hydrogen fuel cell air compressor bearing, and preparation method thereof

Abstract

The invention relates to a high-temperature alloy for a hydrogen fuel cell air compressor bearing, and a preparation method thereof. The high-temperature alloy adopts austenite with a disordered face-centered structure reinforced by adopting an ordered phase L12-gamma' and a body-centered tetragonal ordered structure gamma''-(Ni3Nb); the volume fraction of a reinforcement phase ranges from 10 percent to 25 percent; and the high-temperature alloy is prepared from the components in proportion by weight: 0.02 to 0.08 percent of C, 9 to 18 percent of Fe, 12 to 18 percent of Cr, 0.85 to 1.5 percentof Al, 1.2 to 2.25 percent of Ti, 3.5 to 5 percent of Nb, 2 to 5 percent of Mo, less than or equal to 0.05 percent of B, less than 0.25 percent of Si, less than 0.25 percent of Mn, and the balance Ni, so that the alloy has excellent high-temperature strength and structure stability, and favorable machinable property and economical efficiency. According to the alloy, a TCP phase is not precipitated obviously at the temperature below 760 DEG C, the tensile strength at the temperature being 760 DEG C is larger than 1000MPa, and the alloy is particularly suitable for preparing a medium-high temperature force-bearing part including a hydrogen cell of the hydrogen fuel cell air compressor bearing.

Description

technical field [0001] The invention relates to IPC classification C22C38 / 00 iron-based alloy technology, belongs to the field of hydrogen fuel cells, in particular to a superalloy for hydrogen fuel cell air compressor bearings and a preparation method thereof. Background technique [0002] Superalloys refer to a class of metal materials based on iron, nickel, and cobalt, which can work for a long time at high temperatures above 600°C and under certain stresses. They have excellent high-temperature strength, good oxidation resistance and thermal corrosion resistance, and good Excellent fatigue performance, fracture toughness and other comprehensive properties, mainly used in aerospace and energy fields. [0003] The superalloy is a single austenite structure, which has good structure stability and service reliability at various temperatures. The degree of alloying of superalloys is relatively high. According to the matrix elements, superalloys are divided into iron-based, n...

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Problems solved by technology

Although the high-temperature strength of this type of alloy can meet the service requirements, the microstructure of this type of alloy is relatively complex, and the microstructure will be unstable during long-term service at high temperature, which will lead to a sharp decline in the strength of the alloy. For example, at more than 650 The main strengthening phase in the GH4169 alloy, the γ″ phase transforms into the δ phase at ℃, therefore, it is difficult for this type of alloy to be used for air compressor bearings for a long time

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