Carrier-based aircraft landing gear demands a tough, corrosion-resista
nt material. Because of its high tensile strength, 300M steel was acce
pted as the standard material for aircraft landing gear. However, its
corrosion resistance and fracture toughness are low, and is ill-suited
for advanced aircraft landing gear. A newly developed nickel-cobalt a
lloy steel, named ''AerMet 100,'' has an outstanding combination of hi
gh fracture toughness and high tensile strength. Since its mechanical
properties surpass those of the 300M steel, it has great potential for
application to aircraft landing gear and other fracture critical comp
onents. However, its corrosion behavior was not fully understood. This
study was initiated to characterize the corrosion behavior. The chara
cterization effort included clarification of stress corrosion cracking
, immersion corrosion, salt spray corrosion, and humidity corrosion of
AerMet 100 steel. For comparison, an identical study was concurrently
performed for 300M steel. The results indicate that AerMet 100 steel
is superior to 300M steel with respect to corrosion resistance as well
as mechanical properties.