The role of each element in nickel-based high-temperature alloys

The role of various elements in nickel-based high temperature alloys.
1, the role of boron, silicon elements: significantly lower the melting point of the alloy, expand the solid-liquid phase line temperature zone, the formation of low melting eutectic; deoxidation reduction and slagging function; hardening of the coating, strengthening effect; improve the operational process performance.
2、 The role of copper element: to improve the corrosion resistance of non-oxidizing acid.
3, the role of chromium elements: solid solution strengthening, passivation; improve corrosion resistance and high temperature oxidation resistance; rich chromium is easy to form with carbon, boron chromium carbide, chromium boride hard phase to improve the hardness and wear resistance of the alloy.
4, the role of molybdenum elements: large atomic radius, solid solution so that the lattice undergoes large distortion, significantly strengthen the alloy matrix, improve the high temperature strength of the matrix and red hardness; can cut off, reduce the network organization in the coating; improve the resistance to cavitation, erosion nickel-based precision alloys.

Representative materials of nickel-based high-temperature alloys are

1, Incoloy alloy, such as Incoloy800, the main components are; 32Ni-21Cr-Ti,Al; belong to the heat-resistant alloy.
2, Inconel alloy, such as Inconel600, the main composition is; 73Ni-15Cr-Ti,Al; belong to the heat-resistant alloy.
3, Hastelloy alloy, that is, Hastelloy alloy, such as Hastelloy C-276, the main composition is; 56Ni-16Cr-16Mo-4W; belong to the corrosion-resistant alloy.
4、 Monel alloy, that is, Monel alloy, such as Monel 400, the main composition is; 65Ni-34Cu; belong to the corrosion-resistant alloy.