Microstructure, tensile and creep properties of an austenitic ODS 316L steel

J. R.O. Leo, S. Pirfo Barroso, M. E. Fitzpatrick, M. Wang, Z. Zhou

    Research output: Contribution to journalArticle

    Abstract

    ODS 316L, an austenitic grade of oxide-dispersion-strengthened (ODS) steel, was fabricated by mechanical alloying, hot isostatic pressing and forging. A broad characterisation study was conducted, including High-Resolution Transmission Electron Microscopy (HRTEM) to investigate the microstructure and the interface between oxide particles and the 316L matrix. Mechanical properties at room and elevated temperature were determined by means of tensile and creep tests. Data from the room temperature and high temperature tensile tests were compared with those from conventional 316L. Creep data were used to assess the performance of the ODS 316L against standard assessment codes and in comparison with conventional 316L. Higher mechanical strength was found for the ODS 316L, in comparison to conventional 316L, at room temperature. UTS at high temperature was lower for the ODS 316L, but its yield strength was twice that of 316L. It was found that, although compliant with the Design and Construction Rules for mechanical components of nuclear installations (RCC MR) [1] code for the creep test conditions imposed, the ODS 316L studied is lower strength and has shorter rupture-life than its conventional counterpart. The HRTEM investigations indicated that small oxide particles, <15 nm in size, were coherent or semi-coherent with the steel matrix, whilst larger particles were incoherent.

    Original languageEnglish
    Pages (from-to)158-165
    Number of pages8
    JournalMaterials Science and Engineering A
    Volume749
    Early online date6 Feb 2019
    DOIs
    Publication statusPublished - 11 Mar 2019

    Fingerprint

    tensile creep
    creep properties
    Steel
    tensile properties
    Oxides
    Creep
    steels
    microstructure
    Microstructure
    oxides
    creep tests
    tensile tests
    High resolution transmission electron microscopy
    room temperature
    Temperature
    hot isostatic pressing
    transmission electron microscopy
    forging
    Hot isostatic pressing
    high resolution

    Keywords

    • Creep
    • ODS 316L
    • Oxides
    • Tensile strength

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

    Cite this

    Microstructure, tensile and creep properties of an austenitic ODS 316L steel. / Leo, J. R.O.; Pirfo Barroso, S.; Fitzpatrick, M. E.; Wang, M.; Zhou, Z.

    In: Materials Science and Engineering A, Vol. 749, 11.03.2019, p. 158-165.

    Research output: Contribution to journalArticle

    Leo, J. R.O. ; Pirfo Barroso, S. ; Fitzpatrick, M. E. ; Wang, M. ; Zhou, Z. / Microstructure, tensile and creep properties of an austenitic ODS 316L steel. In: Materials Science and Engineering A. 2019 ; Vol. 749. pp. 158-165.
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