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Heat resistance and microstructure evolution in AISI 316LN + 0.1 %Nb steel at 600 and 625 oc

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F16%3A86100127" target="_blank" >RIV/61989100:27360/16:86100127 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Heat resistance and microstructure evolution in AISI 316LN + 0.1 %Nb steel at 600 and 625 oc

  • Original language description

    Creep resistance of austenitic steels can be improved by small additions of strong carbide and nitride forming elements. Additions of such elements to steels have to be followed by detailed investigations on microstructural stability and surveys of creep failure mechanisms. This paper deals with creep behaviour and microstructure evolution in the AISI 316LN + 0.1 wt. % Nb steel during long-term creep exposure at 600 and 625 oC. Creep tests with a constant tensile load were carried out in air up to times to rupture of 200 000 hours. Microstructure evolution during long-term creep exposure was studied using light microscopy, scanning and transmission electron microscopy. A small addition of niobium resulted in a reduction of the minimum creep rate and shortening of the tertiary creep stage. Investigations on microstructure evolution in creep ruptured specimens revealed the following minor phases: Z-phase (NbCrN), M23C6, M6X (Cr3Ni2SiX type), η-Laves and σ-phase. M6X gradually replaced M23C6 carbides. Primary Z-phase particles were present in the matrix after solution annealing, while secondary Z-phase particles formed during creep. Precipitation of Z-phase was more intensive at 625 oC. The dimensional stability of Z-phase particles was excellent and these particles had a positive effect on the minimum creep rate. However, niobium also accelerated the formation and coarsening of σ-phase, η-Laves and M6X. Coarse particles, especially of σ-phase, facilitated the development of creep damage, which resulted in poor long-term creep ductility.

  • Czech name

  • Czech description

Classification

  • Type

    D - Article in proceedings

  • CEP classification

    JG - Metallurgy, metal materials

  • OECD FORD branch

Result continuities

  • Project

    Result was created during the realization of more than one project. More information in the Projects tab.

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Others

  • Publication year

    2016

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Article name in the collection

    METAL 2016: conference proceedings : (reviewed version) : 25th Anniversary International Conference on Metallurgy and Materials : May 25th-27th 2016, Hotel Voronez I, Brno, Czech Republic, EU

  • ISBN

    978-80-87294-67-3

  • ISSN

  • e-ISSN

  • Number of pages

    6

  • Pages from-to

    837-842

  • Publisher name

    Tanger

  • Place of publication

    Ostrava

  • Event location

    Brno

  • Event date

    May 25, 2016

  • Type of event by nationality

    WRD - Celosvětová akce

  • UT code for WoS article

    000391251200135