HOT CORROSION RESISTANCE AND THERMAL STABILITY OF HIGH CHROMIUM-NICKEL ALLOYS

摘要

Ongoing work has developed high chromium nickel-based alloys suitable for use in shipboard incinerators operating between 704 °C (1300 ℉) and 980 °C (1800 ℉) and has developed the science and technology base for the manufacture of these advanced alloys. Nickel alloys containing more than 30 percent chromium are extremely difficult to fabricate by conventional hot working processes because of the development of a brittle alpha chromium phase. In addition, high-chromium nickel- based alloys are susceptible to a decrease in ductility after exposure to elevated service temperatures. The hot corrosion resistance and thermal stability of various spray-formed, grain-refined fabricable Ni-Cr alloys containing 30 to 50 weight percent chromium and alloys with niobium additions will be examined.