Lower Cost by Substituting Steel for Titanium. AF1410 Steel-Detail Design and Development Tests.
Interim rept. Jul 76-Jun 77,
ROCKWELL INTERNATIONAL LOS ANGELES CALIF LOS ANGELES AIRCRAFT DIV
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Two selected components of the B-1 structure presently designed as Ti 6AL-4V were redesigned using AF1410 steel taking full advantage of the higher strength and lower volume aspects. Both cost and weight savings are documented to show representative possibilities on similar parts of other aircraft structures. A cost saving of 22.9 and 22.1 percent and weight saving of 7.6 and 15.1 percent are projected in the two examples designed. Mechanical properties of AF1410 steel are validated through over 400 development tests run on production heats of this material. Tests covered parent metal properties and weld properties obtained from both static and fatigue tests. A special pre-machining heat-treatment was developed to permit lower cost machining prior to final heat-treatment for high strength properties. Both heat-treat processes were selected from a series of heat-treat tests conducted.
- Metallurgy and Metallography