Predicting the creep-rupture lifetime of a cast austenitic stainless steel using Larson-Miller and Wilshire parametric approaches

Michael L. Santella, Peter F. Tortorelli, Mark Render, Hong Wang, Timothy Lach, Bruce A. Pint, Philip J. Maziasz, Vito Cedro, Xiang (Frank) Chen

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

An experimental dataset of just over 100 creep tests of a cast austenitic stainless steel, CF8C-Plus, was analyzed by two temperature-compensated parametric models (Larson-Miller, Wilshire et al.) to predict long-term lifetimes as functions of temperature and stress. The dataset and associated regression analyses showed greater scatter than typically found in recent similar studies of wrought Ni-based alloys by the same two models and was attributed to the microstructural inhomogeneity of the cast stainless steel. Qualitatively, the Larson-Miller formalism showed greater lifetime prediction accuracy than the Wilshire approach, with the latter model's predictive ability being particularly degraded by the presence of two very significant outlier results. This observation suggests that the Larson-Miller approach is more robust when treating rupture-time datasets that show particularly wide experimental scatter. Despite the differences in the overall predictive ability, both models yielded similar predictions of the applied stress at which CF8C-Plus would have a creep-limited lifetime of 100,000 h when loaded below the yield point.

Original languageEnglish
Article number105006
JournalInternational Journal of Pressure Vessels and Piping
Volume205
DOIs
StatePublished - Oct 2023

Funding

This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the work for publication, acknowledges that the US government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the submitted manuscript version of this work, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).This project is sponsored by the U.S. Department of Energy (DOE), Office of Fossil Energy and Carbon Management, Advanced Energy Materials Program, under contract DE-AC05-00OR22725 with Oak Ridge National Laboratory (ORNL) managed by UT Battelle, LLC. We appreciate the technical support from C.S. Hawkins and J. Moser at ORNL. We also would like to thank Y. Wang and Y. Yamamoto from ORNL for their technical review of this manuscript. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the work for publication, acknowledges that the US government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the submitted manuscript version of this work, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). This project is sponsored by the U.S. Department of Energy (DOE), Office of Fossil Energy and Carbon Management, Advanced Energy Materials Program, under contract DE-AC05-00OR22725 with Oak Ridge National Laboratory (ORNL) managed by UT Battelle, LLC. We appreciate the technical support from C.S. Hawkins and J. Moser at ORNL. We also would like to thank Y. Wang and Y. Yamamoto from ORNL for their technical review of this manuscript.

Keywords

  • CF8C-Plus
  • Cast stainless steel
  • Creep lifetime prediction
  • Creep-rupture experimental data
  • Larson-miller approach
  • Wilshire model

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