L. Flower, S. K. Srivastava, Haynes International, Inc., Kokomo, IN
Preliminary properties will be presented for a new high strength, high temperature wrought sheet superalloy that has been developed by Haynes International to provide exceptionally high creep strength at high temperature. The new alloy will be useful for fabricated high performance aerospace and gas turbine components that operate at temperatures of 1700°F (982°C) and higher. The new alloy has a nominal composition of Co-28Cr-9Ni-21Fe-1.25Ti-1Nb and is produced by vacuum induction melting plus electroslag remelting, followed by conventional hot and cold rolling practices. This cobalt based wrought alloy can be formed and welded by conventional methods prior to final heat treatment. A unique nitride dispersion strengthening heat treatment has been developed to impart exceptionally high creep resistance, which is considerably higher than the creep strength of traditional wrought solid solution strengthened superalloys and approaches the creep strength of oxide dispersion strengthened alloys.
Summary: Preliminary properties will be presented for a new fabricable, high strength, high temperature wrought sheet superalloy that has been developed by Haynes International to provide exceptionally high creep strength at high temperature. This cobalt based wrought alloy can be formed and welded by conventional methods prior to final heat treatment. A unique nitride dispersion strengthening heat treatment has been developed to impart exceptionally high creep resistance
