Embrittlement of an AISI 8640 Lower Bainite Steel

    Volume 21, Issue 5 (September 1993)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 10


    Rinnovatore, JV
    MTA, Inc., Mt. Arlington, NJ

    Lukens, KF
    Metallurgist and failure analyst; mechanical engineer; and engineering technician, U.S. Army Armament Research, Development and Engineering Center, Picatinny Arsenal, NJ

    Reinhold, J
    Metallurgist and failure analyst; mechanical engineer; and engineering technician, U.S. Army Armament Research, Development and Engineering Center, Picatinny Arsenal, NJ

    Mahon, W
    Metallurgist and failure analyst; mechanical engineer; and engineering technician, U.S. Army Armament Research, Development and Engineering Center, Picatinny Arsenal, NJ

    (Received 18 September 1992; accepted 8 April 1993)

    Abstract

    A study was performed to determine the cause of an abnormally low fracture toughness of an AISI 8640 resulfurized steel. The embrittlement effects of phosphorus and arsenic on this steel heat-treated to a lower bainitic structure were studied by employing fracture toughness tests, Charpy impact tests, X-ray fluorescent spectroscopy, and scanning electron microscopy (SEM). The results showed that the steel was embrittled by phosphorus at prior austenite gram boundaries in a manner similar to the tempered martensite embrittlement (TME) phenomenon. Arsenic is also believed to be involved in the embrittlement effect, specifically as related to producing a reduction in the upper shelf Charpy impact energy. Embrittlement was manifested by a reduced fracture toughness, an increase in the Charpy transition temperature, and intergranular fracture.


    Paper ID: JTE11775J

    DOI: 10.1520/JTE11775J

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    Author
    Title Embrittlement of an AISI 8640 Lower Bainite Steel
    Symposium , 0000-00-00
    Committee E28