Superalloy
Superalloys are alloys that exhibit several key properties: excellent mechanical strength, resistance to thermal creep deformation, good surface stability, and resistance to corrosion or oxidation. The crystal structure is typically face-centered cubic austenitic. Examples of such alloys include Hastelloy, Inconel, Waspaloy, Rene alloys, Incoloy, MP98T, TMS alloys, and CMSX single-crystal alloys.
The development of superalloys relies heavily on both chemical and process innovations. Superalloys develop high-temperature resistance through solid-solution strengthening. An important strengthening mechanism is precipitation hardening, which forms secondary phase precipitates such as gamma prime and carbides. Oxidation or corrosion resistance is provided by elements such as aluminum and chromium. [1]
Since 2007, Varzene Metal has specialized in supplying these sophisticated alloys for critical applications such as the chemical industry, aerospace, energy, oil and gas, electrical and electronics, nuclear, aviation, marine, automotive, and more. Since superalloys are designed for high-temperature applications, creep and oxidation resistance are of primary importance. Nickel (Ni)-based superalloys have emerged as the preferred material for these applications. The properties of these Ni-based superalloys are achieved by adding various other elements—both common and exotic—in specific proportions, including not only metals but also metalloids and non-metals; some of the alloys used include those containing chromium, iron, cobalt, molybdenum, tungsten, tantalum, aluminum, titanium, zirconium, niobium, rhenium, yttrium, vanadium, carbon, boron, or hafnium. Each of these additions has been selected to serve a specific purpose in optimizing properties for high-temperature applications.
Ni-based superalloys are excellent high-temperature materials, and although they have proven to be very useful, Co-based superalloys possess potentially superior resistance to hot corrosion, oxidation, and wear compared to Ni-based superalloys. For this reason, efforts have been made in recent years to develop Co-based superalloys. Nevertheless, traditional Co-based superalloys have not found widespread use because they have lower strength than Ni-based ones.
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