Volume 17, Issue 1 (January 1989)

    Linear-Elastic Fracture of High-Nitrogen Austenitic Stainless Steels at Liquid Helium Temperature

    (Received 28 October 1987; accepted 14 July 1988)

    CODEN: JTEOAD

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    Abstract

    Four commercial Fe-Cr-Ni-Mn austenitic stainless steels containing 0.14, 0.26, 0.28, and 0.37 wt% N were fractured in liquid helium at 4 K, and measurements of the linear-elastic plane-strain stress-intensity factor, KIc, were made. Interstitial nitrogen significantly strengthens these steels at low temperatures so that brittle fractures occur under plane strain conditions at 4 K despite moderate ductility in uniaxial tension. The brittle fracture mechanism at 4 K involves a form of cleavage or slip-band cracking as evidenced by the formation of transgranular facets on {111} planes.


    Author Information:

    Tobler, RL
    National Bureau of Standards, Boulder, CO

    Reed, RP
    National Bureau of Standards, Boulder, CO

    Purtscher, PT
    National Bureau of Standards, Boulder, CO


    Stock #: JTE11533J

    ISSN: 0090-3973

    DOI: 10.1520/JTE11533J

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    Author
    Title Linear-Elastic Fracture of High-Nitrogen Austenitic Stainless Steels at Liquid Helium Temperature
    Symposium , 0000-00-00
    Committee E08