Characterization of type 304L stainless steel: Comparison of ASTM A262 practice A and analytical electron microscopy techniques

B. D. Miller, M. G. Burke

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    The ASTM A262 Practice A procedure is frequently used to assess whether Type 304/304L austenitic stainless steels are "sensitized". In this study, Type 304L steel containing 18 ppm boron examined in the as-received (mill solution-annealed) condition exhibited a "dual" structure after the Practice A test despite its low C content. Detailed characterization of this alloy was performed to assess the precipitation behavior in this steel. Intergranular, Cr-rich M2B- borides, identified by electron diffraction, were observed in the as-received condition. Samples aged at 700°C (nominally "sensitized") produced fully "ditched" grain boundaries having Cr levels in excess of 14 wt.% and concomitant Cr-depleted zones less than 50 nm in extent. Despite exhibiting fully "ditched" grain boundaries, Cr levels of ∼18-20 wt.% with no Cr-depleted zones were detected in specimens aged at 900°C (nominally "stabilized"). These results show the Practice A test can be mis-used/mis-interpreted for assessing sensitization.
    Original languageEnglish
    Title of host publication15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011|Int. Conf. Environ. Degrad. Mater. Nucl. Power Syst.-Water React.
    Place of PublicationWarrendale, PA
    PublisherMinerals, Metals & Materials Society
    Pages469-478
    Number of pages9
    Volume1
    ISBN (Print)9781622761944
    Publication statusPublished - 2011
    Event15th International Symposium on Environmental Degradation of Materials in Nuclear Power Systems -- Water Reactors - Colorado Springs, CO
    Duration: 31 Jul 20115 Aug 2011

    Conference

    Conference15th International Symposium on Environmental Degradation of Materials in Nuclear Power Systems -- Water Reactors
    CityColorado Springs, CO
    Period31/07/115/08/11

    Fingerprint

    Dive into the research topics of 'Characterization of type 304L stainless steel: Comparison of ASTM A262 practice A and analytical electron microscopy techniques'. Together they form a unique fingerprint.

    Cite this