Engineering approach to creep strain modelling for a multicast 9Cr steel

Stefan Holmström, Pertti Auerkari, Juhani Rantala

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

    3 Citations (Scopus)


    A simple, robust and effective parametric model has been developed to provide master curves of creep strain from uniaxial creep testing. The corresponding master curve has been produced for a multicast data set of P91 steel using data from both uninterrupted and interrupted creep tests. The time to specified creep strain at given stress and temperature was fitted in the strain range of 0.1 to 15%. With typical inhomogeneous creep data, the recommended approach involves a four-step procedure: initial investigation of the data quality, heat-specific intermediate modelling of the raw data, extraction of heat-specific stress-temperature-time values for selected evenly spaced range of strain, and re-fitting of these balanced values to the final master curve. The master curve is tested and validated for overall fitting efficiency comparison to other more complex models and to available 1% creep strain and failure predictions. Very competitive fitting efficiency was observed in spite of the simplicity of the model.
    Original languageEnglish
    Title of host publication2006 ASME Pressure Vessels and Piping/ICPVT-11 Conference Proceedings
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Print)0-7918-4757-8
    Publication statusPublished - 2006
    MoE publication typeA4 Article in a conference publication
    EventASME Pressure Vessels and Piping Conference, PVP 2006: Held jointly with the 11th International Conference on Pressure Vessel Technology, ICPVT-11 - Vancouver, Canada
    Duration: 23 Jul 200627 Jul 2006


    ConferenceASME Pressure Vessels and Piping Conference, PVP 2006


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