Tow Missile Stress Corrosion Study (Ring Specimens)
Abstract
This report addresses a stress corrosion study on 300 grade, 18% cobalt containing maraging steel (C-300) and 250 grade, cobalt-free maraging steel (T-250) TOW missile motor cases. In the early 1980's cobalt became a strategic element which led to the use of T-250 in place of C-300 in this missile system. This report attempts to establish relative differences in stress corrosion susceptibility between the two materials in the component fabricated condition. The specimens used in this study were ring-type specimens, which were machined from along the length of the actual rocket motor cases. Each specimen was notched, precracked, and tested in a salt water environment. Load versus time-to-failure data was obtained. Also investigated was the possible effects of residual stress on the load versus time-to-failure data. Results indicate significant scatter in the data, which could be attributed to the residual stresses along the length of the rocket cases. There was no significant difference in time-to-failure between the two steels.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1989
- Accession Number
- ADA207744
Entities
People
- Charles F. Hickey Jr.
- Joseph A. Falco
- Wayne M. Bethoney