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Correlation of ferrite formation to creep properties of Cr-Mo steel welds

Henry Granjon prize 2013 winner category B: materials behaviour and weldability

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Abstract

A factor of four decreases from 16.0 × 10−4 to 4.1 × 10−4 %/h in steady state creep rate was observed in the fine-grained heat-affected zone (FGHAZ) of a Cr-Mo steel weld, by reducing the pre-weld tempering temperature from 760 to 650 °C. The current study used electron backscatter diffraction and synchrotron x-ray diffraction techniques to characterize the microstructure in the FGHAZ of the two tempering temperature conditions. The results showed carbide-free ferrite that formed in the FGHAZ of weldments that were pre-weld tempered at 760 °C, contributed to void formation resulting in lower creep strength. It is proposed that the formation of ferrite in the FGHAZ is due to the incomplete dissolution of Cr23C6 carbide at heating process during welding, which results in Cr enrichment adjacent to the undissolved Cr23C6 carbide. Dictra simulation confirmed ferrite formation at the carbide/austenite boundaries during Cr23C6 carbide dissolution.

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Acknowledgments

This research was conducted as part of the Fossil Energy Advanced Research Materials Program, which is sponsored by the Crosscutting Research  Program, Office of Fossil Energy, U.S. Department of Energy. The author would like to thank Dr. Yukinori Yamamoto and Dr. Mike Santella from Oak Ridge National Lab (ORNL) for the mentoring and discussion. Dr. Terasaki and Dr. Komizo from Osaka University are thanked for their help and discussion on the synchrotron experiments. Mr. Thomas Muth from ORNL is thanked for technically reviewing the manuscript. The synchrotron radiation experiments were performed at the BL46XU of SPring-8 as the Priority Research Proposal (priority filed: industrial application) with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (proposal no. 2011B1968).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, USA

    Xinghua Yu

  2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

    Xinghua Yu

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  1. Xinghua Yu
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Correspondence to Xinghua Yu.

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The research work was supervised by Professor Sudarsanam Suresh Babu at The Ohio State University, Columbus, OH. This submission was sponsored by a contractor of the United States Government under contract DE-AC05-00OR22725 with the United States Department of Energy. The United States Government retains, and the publisher, by accepting this submission for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, and worldwide license to publish or reproduce the published form of this submission, or allow others to do so, for the United States Government purposes.

Doc. IIW-2512, recommended for publication by Commission IX “Behaviour of Metals Subjected to Welding.”

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Yu, X. Correlation of ferrite formation to creep properties of Cr-Mo steel welds. Weld World 59, 251–259 (2015). https://doi.org/10.1007/s40194-014-0200-5

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  • DOI: https://doi.org/10.1007/s40194-014-0200-5

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