STP338

    Low-Cycle Fatigue Properties of Complex Welded Joints of High-Strength 301, 304L, 310, and AM-355 Stainless Steel Sheet Materials at Cryogenic Temperatures

    Published: Jan 1963


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    Abstract

    The high-stress, low-cycle fatigue properties of several complex welded joints were determined on types 301, 304L, 310, and AM-355 stainless steels at 78, −320, and −423 F. The welded joints were designed to give nearly 100 per cent static tension joint efficiency and are typical of joint designs of high-strength, thin sheet materials used in missile and space craft fabrication. The number of cycles to failure were obtained at 75, 85, and 95 per cent of the typical yield strength of the parent metal at each corresponding temperature or at 75, 85 and 95 per cent of the static tensile strength of the complex welded joint in the event that failure occurred below the yield strength of the parent metal. Five replicate fatigue specimens (test section of 4 by 16 in.) were tested in each test condition of temperature and stress level. The average number of cycles to failure varied from 5 to 1750 depending upon the material and test conditions.

    The data indicate that 60 per cent cold-rolled type 301 stainless steel possesses the most desirable joint fatigue properties at 78 F; at −320 F, types 301, 304L, and 310 stainless steel have nearly identical joint fatigue properties. At −423 F, 75 per cent cold-rolled 310 and 50 per cent cold-rolled 304L stainless steels have the most desirable joint fatigue properties.

    The tensile properties of the parent materials and of simple fusion welds and resistance spot welds were determined at 78, −100, −320, and −423 F. Also, notched tensile strengths were determined with specimens having stress concentration, Kt, values from 3.2 to 19.0 at the same temperatures. Correlation of the tensile and notched tensile data with the fatigue results are given.


    Author Information:

    Christian, J. L.
    Senior Engineering Metallurgist, Chief of Materials Research, and Staff Scientist, General Dynamices Corp., San Diego, Calif

    Hurlich, A.
    Senior Engineering Metallurgist, Chief of Materials Research, and Staff Scientist, General Dynamices Corp., San Diego, Calif

    Watson, J. F.
    Senior Engineering Metallurgist, Chief of Materials Research, and Staff Scientist, General Dynamices Corp., San Diego, Calif


    Paper ID: STP44461S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP44461S


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