Guidelines for evaluating in-service creep damage: Nordtest Project 1183-94 Final Report

Pertti Auerkari, Jorma Salonen, Kjeld Borggreen

    Research output: Book/ReportReport

    Abstract

    To indicate safe life or re-evaluation periods for high-temperature components, assessment based on measured creep cavitation damage is used worldwide. To interpret the observed damage unambiguously requires evaluation of the extent of damage on a unique, clearly defined and accepted scale. The presently available European damage scales in the guidelines NORDTEST NT TR 170 and VGB-TW 507 provide reference micrographs for a range of creep damage in the most common high-temperature steels. However, these guidelines differ in their stated and implicit definitions of a given class (extent) of damage, although both guidelines are nominally based on the same original Neubauer scale of creep damage.

    This work provides a comparison of the guidelines NORDTEST NT TR 170 and VGB-TW 507 guidelines, as well as an attempt to unify the European creep damage scales. The proposed unified definitions of damage are based on the quantified damage scales of NORDTEST NT TR 170 with limited revisions and simplifications. The new definitions for damage classification also aim to correct inconsistencies in the present guidelines, with minimum modifications to the actual example micrographs. The main use of the definitions is foreseen in constructing or extending compilations of reference micrographs on in-service damage, and in calibrating image analysis of such damage.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages14
    Publication statusPublished - 1995
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesNordtest technical report
    NumberNT-TR-302
    ISSN0283-7234
    SeriesVTT Manufacturing Technology. Research Report
    NumberVALB105

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  • Cite this

    Auerkari, P., Salonen, J., & Borggreen, K. (1995). Guidelines for evaluating in-service creep damage: Nordtest Project 1183-94 Final Report. VTT Technical Research Centre of Finland. Nordtest technical report, No. NT-TR-302, VTT Manufacturing Technology. Research Report, No. VALB105 https://www.nordtest.info/index.php/technical-reports/item/guidelines-for-evaluating-in-service-creep-damage-nt-tr-302.html