Notch Rupture Tests of Inconel X and Nimonic 80A

    Published: Jan 1953

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    To obtain some information on the effect of notches on the rupture strength of Inconel X and Nimonic 80A, tests were made at 1100, 1350, and 1500 F on Inconel X and at the two latter temperatures on Nimonic 80A. Using a notch 0.042 in. deep with a root radius of 0.005 in., neither alloy is indicated to be notch sensitive except for extended service at 1350 F. The presence of notch sensitivity while associated with the range of minimum ductility does not appear to accompany any particular ductility value. Both materials were found to be insensitive to shallow, sharp notches at 1350 F, suggesting that accidental surface imperfections would have small effect on the service life of these alloys. It was observed that a definite decrease in the number of cracks present in a plain rupture specimen after fracture may have some correlation with notch sensitivity.

    Author Information:

    Furman, D. E.
    Research Laboratory, International Nickel Co., Inc., Bayonne, N. J.

    Talbot, A. M.
    Research Laboratory, International Nickel Co., Inc., Bayonne, N. J.

    Paper ID: STP41684S

    Committee/Subcommittee: E04.05

    DOI: 10.1520/STP41684S

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