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Heat Strength Evaluation and Microstructures Observation of the Welded Joints of One China-Made T91 Steel

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Abstract

T91 (9Cr1MoVNb), the martensitic heat-resistant steel, is widely applied in industries like power generation, petrochemical, nuclear, etc., and a wealth of researches has been conducted on its properties so far. However, actually for China, T91 was begun to be domestically manufactured only from the end of last century. Hence, thorough assessments of the China-made T91 steels are always urgently required, especially for its welded joints. In this paper, the relationship between mechanical properties and microstructures of the welded joints of one China-made T91 steel was experimentally discussed. Moreover, aging test and creep rupture test were utilized for both analyzing the heat strength and predicting the service life of the joints. Results showed that welded joints of this China-made T91 steel could exhibit sufficient strength under the operating conditions of most nuclear reactors used nowadays.

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Acknowledgments

The work was supported by both National Natural Science Foundation of China (Grant 50871076) and Shanghai Leading Academic Discipline Project (Project Number: B113). Meanwhile, part of the tests was cooperated by Shanghai Institute of Special Equipment Inspection & Technical Research and Shanghai Boiler works Ltd. Finally, gratitude must also be given to Shanghai Research Institute of Materials for providing various experimental conditions.

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Authors and Affiliations

  1. Department of Materials Science, Fudan University, Shanghai, 200433, People’s Republic of China

    Yi Gong & Zhen-Guo Yang

  2. Power Station, Baosteel Group Co. Ltd., Shanghai, 201900, People’s Republic of China

    Fa-Yun Yang

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  1. Yi Gong
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Correspondence to Zhen-Guo Yang.

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Gong, Y., Yang, ZG. & Yang, FY. Heat Strength Evaluation and Microstructures Observation of the Welded Joints of One China-Made T91 Steel. J. of Materi Eng and Perform 21, 1313–1319 (2012). https://doi.org/10.1007/s11665-011-0048-4

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