A precipitation-strengthened nickel-cobalt-based alloy with high oxidation resistance and its preparation method

Abstract

The invention discloses a precipitation-strengthened nickel-cobalt-based alloy with high oxidation resistance and a preparation method thereof. The composition of the alloy is calculated by weight percentage: 0.03≤C≤0.1%, 0<B≤0.003%, 14≤Cr≤ 17%, 25≤Co≤30%, 3≤W≤12%, 0.5≤Nb≤2%, 2.5≤Al≤6%, 1≤Ti≤4%, 0≤Hf≤0.15%, 0≤Ta≤2 %, the balance is Ni, wherein, when 1.5≤Al / Ti<3, 4<Cr / Al≤6; when 3≤Al / Ti≤6, 2.5≤Cr / Al≤4. When the Al content is constant, the Al / Ti ratio in the alloy is used to reduce the Cr content and promote the alloy to spontaneously form a protective Al 2 o 3 The film solves the technical problem that the alloy must simply increase the content of Cr or Al to improve the oxidation resistance, and increases the adjustment margin of the content of other elements in the alloy.

Description

technical field

[0001] The invention relates to the field of nickel-cobalt-based alloys, in particular to a precipitation-strengthened nickel-cobalt-based alloy with high oxidation resistance and a preparation method thereof. Background technique

[0002] Due to its excellent high-temperature strength, fatigue performance and good high-temperature oxidation / corrosion resistance, superalloys based on iron, cobalt, and nickel can work in high-temperature environments above 600°C for a long time. Among the three types of superalloys, traditional cobalt-based superalloys mainly rely on solid solution strengthening or carbide strengthening, and their high-temperature strength is low, so they are mainly used in environments with low mechanical loads. In contrast, nickel-based superalloys with γ′ (Ni 3 Al) phase strengthening is the main strengthening method, which has excellent mechanical properties, but the corrosion resistance of nickel-based superalloys is poor. In order to a...

Images