Corrosion Behavior of Landing Gear Steels
Abstract
A study was conducted on the corrosion behavior of an AerMet 100 steel and a 300M steel. This study included investigations of stress corrosion cracking (SCC), immersion corrosion, salt spray corrosion, and humidity corrosion of both steels. For the SCC investigation, double cantilever beam (DCB) specimens were employed, and for the immersion, salt spray, and humidity corrosion investigations, sheet specimens were used. The SCC rate is less and the threshold stress intensity for stress corrosion (KSubSCC) is greater in the AerMet 100 steel (33 ksi*in less than l/2) than in the 300M steel (19 ksi*in less than 1/2), indicating better SCC resistance of the AerMet 100 steel. In the AerMet 100 steel, the stress corrosion crack grows along an intergranular and transgranular path in the direction of forging deformation. The immersion corrosion and salt spray corrosion rates of the AerMet 100 steel is 33 - 40% and 13 - 20% of those for the 300M steel, respectively. Evidence of humidity corrosion is not detectable in the AerMet 100 steel within the employed test period 110 days, whereas it is substantial (2.0413 mpy or 0.0447 mdd) in the 300M steel. The overall results indicate that the AerMet 100 steel is superior to the 300M steel with respect to the corrosion resistance as well as the mechanical properties. AerMet 100 and 300M steel, Stress corrosion cracking, SCC, Double Cantilever Beam, DCB
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 29, 1993
- Accession Number
- ADA285862
Entities
People
- Eun U. Lee
Organizations
- Naval Air Warfare Center Aircraft Divison