Low-Re, low-S and hot-corrosion-resistant nickel-based single crystal superalloy
A technology of nickel-based single crystal and superalloy, which is applied in the field of low-S heat-resistant corrosion-resistant nickel-based single crystal superalloy, low Re, and component materials, which can solve the problem of lack of hot corrosion resistance, narrow composition design space, and Cr content Low problems, to achieve the effects of excellent thermal corrosion resistance, excellent oxidation resistance, and tissue stability
Inactive Publication Date: 2021-01-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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However, it should be noted that the composition design space of this type of alloy is extremely narrow
[0003] At present, the thermal corrosion-resistant nickel-based single crystal superalloys developed in my country mainly include DD8, DD10 and DD413, etc. These alloys have good thermal corrosion resistance, but their strength is far below the level of the second-generation single crystal superalloys at home and abroad.
In addition, the second-generation high-strength nickel-based single crystal superalloys developed in my country mainly include DD6 and DD5, but these alloys have low Cr content and do not have thermal corrosion resistance.
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[0036] See Table 1 for the chemical composition of the nickel-based single crystal superalloy sample of the present invention. The alloy of the present invention utilizes pure Ni, Co, Cr, W, Mo, Ta, Ti, Al, Re, C, Hf and other elements to melt in a vacuum induction furnace (refining temperature: 1500±10°C, refining time 20min, vacuum during the refining period degree ≤ 3Pa), and cast into a master alloy with a chemical composition that meets the requirements, and then remelt and utilize it through directional solidification equipment (high-speed solidification method or liquid metal cooling method, pouring at 1500 ° C, directional solidification pulling rate of 3mm / min) Directional solidification into a single crystal test bar by spiral crystal selector or seed crystal method. Heat treatment is required before use. The heat treatment system is: 1280°C / 2h / AC+1305°C / 6h / AC+1130°C / 4h / AC+900°C / 20h / AC (AC: air cooling).
[0037] For the convenience of comparison, the chemical comp...
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The invention discloses a low-Re, low-S and hot-corrosion-resistant nickel-based single crystal superalloy, and belongs to the technical field of nickel-based single crystal superalloys. The superalloy comprises the following chemical components of, in percentage by weight, 8.5% to 10.5% of Cr, 5.0% to 7.0% of Co, 0.5% to 1.2% of Mo, 6.0% to 7.5% of W, 4.0% to 5.5% of Ta, 4.2% to 5.5% of Al, 0.8%to 2.5% of Ti, 1.0% to 2.0% of Re, 0 to 0.1% of C, 0 to 0.2% of Hf, the balance Ni, less than or equal to 0.5% of Ta / Cr and less than or equal to 2.1% of Nv. The superalloy not only has excellent hotcorrosion resistance and oxidation resistance, but also has high high-temperature mechanical properties and good structure stability. The superalloy can be suitable for high-temperature parts of ground and ship gas turbines, and can also be suitable for high-temperature parts of aero-engines serving in a near-ocean environment.
Description
technical field [0001] The invention relates to the technical field of nickel-based single-crystal superalloys, in particular to a low-Re, low-S heat-corrosion-resistant nickel-based single-crystal superalloy, which is mainly suitable for component materials that withstand relatively high stress under high-temperature thermal corrosion conditions . Background technique [0002] The development of scientific and technological fields such as offshore aero-engines, naval gas turbines, and ground gas turbines requires that the high-temperature alloy materials used for engine turbine blades not only have good thermal corrosion resistance and long-term structural stability, but also have significantly better high-temperature mechanical properties than the first The level of the first generation single crystal superalloy (close to or reach the level of the second generation single crystal superalloy). However, it should be noted that the design space for the composition of such al...
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Login to View More IPC IPC(8): C22C19/05C30B29/52
CPCC22C19/056C30B29/52
Inventor 王栋王迪姜祥伟张功董加胜楼琅洪张健
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI