Alloy 625 in aerospace engineering (Tech Center of Shanghai HY Industry Co., Ltd)
ALLOY 625 and aeronautical engineering are a good combination. In this article, explore why ALLOY 625 is an essential high-performance nickel alloy for aerospace engineering.
When ALLOY 625 was first introduced in the early 1960s, the possibilities for how to use it in the future were endless. Although it may have been originally invented for use in supercritical steam pipelines, metallurgical experts foresee its importance in seawater, aerospace, and chemical processing applications. These predictions have now been realized, and ALLOY 625 is now the main material in the aerospace industry.
With the passage of time, the development of processing methods has made this versatile nickel alloy firm its position in the field of high-end alloys, becoming one of the most popular and versatile materials selected by design engineers. For example, minor changes to its composition and milling method increase its fatigue life as a thin plate, which opens up new and exciting uses.
In many different industries, alloy 625 has become the standard material for design, which proves the versatility of this alloy. With the passage of time, it has helped solve many design problems, and with the development of the industry, the range of possible applications of this magical alloy has become wider and wider.
01 Key features of aerospace applications
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With the modernization, expansion and development of the aerospace industry, the potential end-uses of this high-performance alloy have also evolved. Its unique microstructure gives the material an impressive set of properties, making it an essential feature. First of all, its excellent corrosion resistance enables it to operate in various extreme environments. For example, its ability to withstand high temperatures enhances its practicality under the high pressure and high temperature conditions of aircraft engines. It is not surprising that aerospace engineering is closely linked to ALLOY 625. -
Its chemical composition also determines its use in aerospace applications. The coexistence of molybdenum and nickel makes the alloy have good resistance to non-oxidizing environments and makes it particularly resistant to pitting and crevice corrosion. A small amount of niobium can stabilize its welding resistance and prevent intergranular corrosion.
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The niobium content also includes tantalum, which is a hard transition metal with a high degree of corrosion resistance and a high melting point. The super combination of nickel, chromium, molybdenum and niobium alloy can harden the alloy matrix and obtain natural high strength without special heat treatment.
02choose super alloy
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ALLOY 625 is called “super alloy” or high temperature alloy, which means that it has excellent performance to win this honor. Including its excellent mechanical strength, corrosion resistance, heat resistance, thermal creep deformation and surface stability. The term was first used after World War II to describe a group of alloys used in aircraft turbine engines that operate at inherently high temperatures. Therefore, “superalloys” have a great foundation in the aerospace field, so the term is suitable for many other applications, such as gas turbines, rocket engines, and chemical plants. -
Even if exposed to temperatures above 650°C (1200°F) for a long time, the superalloy can maintain good strength. Combined with its ability to also have low temperature ductility and surface stability, it is no wonder that this group of high-performance alloys is considered “super”.
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Due to the numerous advantages of nickel-based superalloys, they are essential in the aerospace industry. This versatile metal is difficult to replace with any other material, while retaining their well-known basic characteristics and the reliability of these high-performance tasks.
03 Application in Aerospace
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ALLOY 625 has many potential applications in the aerospace industry, including aircraft piping systems and jet engines. Due to its versatility, the actual application list is quite extensive. Nickel alloys are widely used due to their high temperature resistance, magnetic properties and corrosion resistance.
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Jet engines present unique challenges to design engineers because they are exposed to extreme temperatures at both ends of the engine. At cruising altitude, the average outside air temperature is about -56.3°C (-74.7°F), and the actual combustion process may exceed 1,150°C (2,120°F).
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One of the main applications of ALLOY 625 in the aerospace industry is in the exhaust system of aircraft. The materials used in these demanding exhaust systems must be durable, wear-resistant, tough and resistant to high temperatures. ALLOY 625 can be used for exhaust pipes, vector nozzles, bellows and silent kits and other key components.
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An example of the use of the ALLOY 625 as the main aircraft is the Prowler of the US Navy, which is part of the CMX-124 exhaust pipe. This material was chosen because of its excellent fatigue properties, strength and sensitization resistance.
