Learn About Inconel 718
Inconel 718 is a nickel-chromium alloy containing significant proportions of iron, niobium, and molybdenum along with lesser amounts of aluminum and titanium. It combines corrosion resistance and high strength with superb weldability, including resistance to postweld cracking. The combination has excellent creep-rupture strength at temperatures up to 700 oC (1300 oF). Used in rocket engines, nuclear reactor, pumps, spacecraft, gas turbines and tooling.
Inconel 718 alloy is a precipitation hardenable, nickel-based superalloy which has really good corrosion resistance, high strength at ambient temperature, and excellent creep and fatigue strengths at high temperature. Thus the alloy is used for a variety of applications for instance gas turbines, jet engines, steam generators, and fission and fusion reactor structures (1-10). Recently, the alloy has been used for the beam window as well as other components of the Los Alamos Neutron Science Center (LANSCE) accelerator, and was selected as a back-up element for target components of the Spallation Neutron Source (SNS) under construction at Oak Ridge National Laboratory (ORNL) and other large scale accelerators (11-16). In those uses, the alloy has a composite structure of austenitic matrix and precipitated c0 and c00 phases made by a typical heat treatment consisting of solution annealing and aging (17).
It is known that high fluence irradiation of this composite composition undergoes negligible radiation-induced hardening and even softening with considerable decrease in ductility (7,11-13). Transmission electron microscopy (TEM) investigations (14,15,16) show that superlattice spots diffracted from the c0 and c00 precipitates disappeared from the diffraction traits of the aged Inconel 718 after irradiation to a fraction of 1 dpa. The dose-dependent softening was stated by the radiation-induced dissolution of the hard precipitates (13-16).
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