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Steel Aircraft Casings

Report Number: ASD TR 61-7-630
Author: Elizondo, Y. J.
Author: Turner, C. T.
Author: Vorhes, W. B.
Corporate Author: Chance Vought Corporation, Aeronautics Division
Laboratory: Manufacturing Technology Laboratory
Date of Publication: 1961-08
Pages: 297
Contract: AF 33(600)-36159
Project: 7-360
AD Number: AD0264691

Alloy steels selected for environmental requirements of 600°F and 900°F were modified to permit production of high strength, precision steel castings for aircraft. Strength on the order of 200,000 psi at room temperature and 170,000 psi at 900°F were obtained with one alloy, and 360,000 psi at room temperature and 245,000 psi at 600°F with a second alloy. The modified alloys were AM-355 and 4340.

Casting designs were developed and foundry techniques established to produce three casting configurations utilizing three different foundry processes. Castings were produced and static and fatigue tests were performed to prove the ability to reproduce the mechanical properties obtained during the alloy development phase.

Problem areas were found to exist whereby increased process control and inspection requirements were necessary to permit the use of high strength precision steel casting in aircraft designs. Utilizing these increased process controls and increased criteria, the castings were proven to be feasible as well as competitive with other fabrication processes.

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