Nickel-based alloy refers to a high alloy with nickel as the matrix (generally greater than 50%) and copper, molybdenum, chromium and other elements as alloying elements. The main alloying elements of nickel-based alloys are chromium, tungsten, molybdenum, cobalt, aluminum, titanium, boron, zirconium and so on. Among them, Cr, Al, etc. mainly play an anti-oxidation effect, and other elements have solid solution strengthening, precipitation strengthening and grain boundary strengthening. Nickel-based alloys mostly have austenitic structure. In the state of solid solution and aging treatment, there are also intermetallic phases and metal carbonitrides on the austenite matrix and grain boundaries of the alloy. Nickel-based alloys are generally cast through an investment casting process. The common grades of nickel-based alloys for casting are as follows:
- 1) Ni-Cr-Mo alloy, Hastelloy series C-276, C-22, C-2000, C-4, B-3
- 2) Ni-Cr alloy: Inconel 600, Inconel 601, Inconel 625, Inconel 718, Inconel X 750, Incoloy 800, Incoloy 800H, Incoloy 800HT, Incoloy 825;
- 3) Ni-Cu alloy, Monel 400, Monel K500
