Cobalt-based high-temperature alloy wire and preparation method thereof

Abstract

The invention provides a cobalt-based high-temperature alloy wire which is prepared from the following chemical components in percent by mass: 0.06-0.12% of C, less than or equal to 0.3% of Si, 1-1.8%of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 19.2-20% of Cr, 9.5-10.5% of Ni, 14.2-15.5% of W, less than or equal to 2.8% of Fe, less than or equal to 0.4% of other impurities and the balance Co. By adding 19.2-20% of Cr, the cobalt-based high-temperature alloy wire has excellent corrosion resistance, and a condition that high-temperature strength is decreased as aresult of a double phase area as the content of Cr is too high to promote generation of an epsilon-Co phase and a sigma phase is avoided. Elements such as massive Co, 14.2-15.5% of W and 19.2-20% ofCr and the like in the cobalt-based alloy can reduce stacking fault energy, so that the high-temperature strength of the alloy is improved. The content of W is controlled at 19.2-20%, so that it is ensured that a condition of prominent work hardening of the alloy, difficulty in cold processing and poor stability as the too high W content is avoided. As the cobalt-based high-temperature alloy wirecontains 9.5-10.5% of Ni, the tissue stability of the alloy is improved favorably, and precipitation of a Co7W6 phase is reduced. By adding 1.1-1.8% of Mn, the oxidation resistance of a Ni-Cr alloy isimproved effectively.

Description

technical field [0001] The invention relates to the preparation of alloy materials, in particular to a cobalt-based superalloy wire and a preparation method thereof. Background technique [0002] With the development of industrial technology. It is required to use high-temperature materials with fatigue resistance, creep resistance, thermal stability and oxidation resistance at higher temperatures to meet the design requirements of advanced equipment (mainly aviation applications), so people have never stopped for more than half a century Through the research and development of various high-temperature alloy materials. High-temperature alloys are also called heat-strength alloys and superalloys. According to the matrix structure materials can be divided into three categories: iron-based, nickel-based and chromium-based. Cobalt-based alloys are a class of alloys with cobalt as the main component, containing a considerable amount of nickel, chromium, tungsten, and a small a...

AI Technical Summary

Problems solved by technology

The content of impurities in the current cobalt-based alloys still cannot be effectively controlled, and the control of the content of each component during smelting makes its corrosion resistance, high temperature oxidation resistance, etc. cannot be better improved

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