STP370: Ausform Fabrication and Properties of High-Strength Alloy Steel

    Gerberich, W. W.
    Senior research and development scientistsupervisor of Welding Sectionsupervisor of Process Metallurgy Sectionproduct engineer, Philco, a Subsidiary of Ford Motor Co., Newport Beach, Calif.

    Williams, A. J.
    Senior research and development scientistsupervisor of Welding Sectionsupervisor of Process Metallurgy Sectionproduct engineer, Philco, a Subsidiary of Ford Motor Co., Newport Beach, Calif.

    Martin, C. F.
    Senior research and development scientistsupervisor of Welding Sectionsupervisor of Process Metallurgy Sectionproduct engineer, Philco, a Subsidiary of Ford Motor Co., Newport Beach, Calif.

    Heise, R. E.
    Senior research and development scientistsupervisor of Welding Sectionsupervisor of Process Metallurgy Sectionproduct engineer, Philco, a Subsidiary of Ford Motor Co., Newport Beach, Calif.

    Pages: 18    Published: Jan 1965


    Abstract

    The Ausform process has been developed for production applications to the point that the strength, ductility, and toughness of commercially available materials are improved by simply altering the order of conventional metal processing. Shear spinning is being used for Ausform fabrication of tubular components such as missile cases with electron-beam welding being utilized to girth weld head closures on finished cases. Electron-beam welding of steels in the Ausformstrengthened condition proved successful with joint efficiencies of 90 per cent obtained. In addition to the investigation of fabrication techniques, a detailed study of the crack propagation characteristics of ausformed steel is presented. A considerable amount of fracture toughness data obtained from longitudinally rolled specimens indicate that, for a commensurate yield strength, the toughness of the ausformed steel is much greater than the corresponding conventionally-treated material. For example, fracture toughness values well over 200 ksi √in. were attained for 250 ksi yield strength materials obtained by ausforming both D6AC and a low-carbon modified H-11. Charpy V-notch impact data give similar results for both closed die and high-energy-rate forgings made of low-alloy steels. With proper processing and alloying, toughness to strength ratios greater than that obtainable with maraging steels is possible.


    Paper ID: STP47121S

    Committee/Subcommittee: A01.13

    DOI: 10.1520/STP47121S


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