Print Email Facebook Twitter On the Relationship between the Chromium Concentration, the Z-Phase Formation and the Creep Strength of Ferritic-Martensitic Steels Title On the Relationship between the Chromium Concentration, the Z-Phase Formation and the Creep Strength of Ferritic-Martensitic Steels Author Yu, H. (TU Delft Novel Aerospace Materials) Xu, W. (TU Delft Novel Aerospace Materials; Northeastern University) van der Zwaag, S. (TU Delft Novel Aerospace Materials) Date 2018 Abstract In this study, the long term creep strength behavior of commercial heat resistant martensitic/ferritic steels with Cr levels ranging from 1 to 15 wt% is analyzed by linking their computed equilibrium compositions to their creep properties. At lower Cr levels, the calculated strength due to precipitation hardening agrees well with the experimental results. At high chromium levels and longer exposure times, an accelerated strength loss due to the formation of Z-phase precipitates has been reported. The accelerated strength loss is computationally analyzed and a correlation between accelerated strength loss and Z-phase formation is confirmed. A study is made to explore the option of adjusting the chemical composition of existing high-chromium steels to reduce the driving force for Z-phase formation. However, no proper composition ranges are found which combine a high Cr concentration with a significantly lower driving force for Z-phase formation. Subject chromium concentrationferritic-martensitic steels steelmicrostructureZ-phase To reference this document use: http://resolver.tudelft.nl/uuid:2d1fdae0-8c4c-42fb-b61e-3d690d3d9e4a DOI https://doi.org/10.1002/srin.201800177 Embargo date 2019-12-31 ISSN 1611-3683 Source Steel Research International, 89 (10) Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2018 H. Yu, W. Xu, S. van der Zwaag Files PDF srin.201800177.pdf 1.68 MB Close viewer /islandora/object/uuid:2d1fdae0-8c4c-42fb-b61e-3d690d3d9e4a/datastream/OBJ/view