Corrosion-Fatigue Crack Propagation Studies of Some New High-Strength Structural Steels

摘要

Fatigue crack propagation studies were conducted on three new high-strength structural steels: 9Ni-4Co-0.20C, quenched and tempered; 10Ni-2Cr-1Mo-8Co, dual strengthened; and 13Cr-8Ni-2Mo, precipitation-hardened stainless. The yield strengths of these steels ranged from 176 to 193 ksi. Notched cantilever-bend specimens of each steel were cycled zero-to-tension in two environments - room air and 3.5% NaCl salt water. Fatigue crack growth rates were measured experimentally and correlated with the crack tip stress-intensity factor range. The results indicate that these new steels possess greater resistance to fatigue crack propagation and less sensitivity to environment than previously studied steels of comparable strength. (Author)