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Study on Creep Properties for TIG Welded Joints of CLAM Steel

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An Erratum to this article was published on 11 November 2015

Abstract

The reduced activation ferritic/martensitic steel will withstand long-term high-temperature loading during the application in fusion reactors. In this work, the investigation of creep properties of China low activation martensitic (CLAM) TIG welded joints has been carried out at 823 K and with the applied stresses ranging from 180 to 260 MPa. The creep curve has been studied and plotted and the mathematical model has been constructed to analyze the creep mechanism. According to the results, the TIG welding joints of CLAM exhibited the typical three-stage creep curves, and at the constant temperature, the steady creep rate increased and the rupture time decreased with the increase of stress. The stress exponent n obtained from creep equation was higher than the typical values about 3–5, and activation energy Q was about 436 kJ/mol K, also higher than the self-diffusion energy of Fe (300 kJ/mol K), indicating the dislocation creep deformation mechanism, which is further proved by the microcosmic TEM images.

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Acknowledgments

This work is supported by the China National Natural Science Foundation with Grant Nos. 51375216 and 51505197, and the Open-Fund Research of State Key Lab of Advanced Welding and Joining with Grant No. AWJ-Z13-01.

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Authors and Affiliations

  1. School of Material Science and Engineering of Jiangsu University, No. 301 Xuefu Rd, Zhenjiang, Jiangsu, China

    Xin Zhang, Yucheng Lei, Fei Huang & Qiang Zhu

  2. School of Material Science and Engineering of Southeast University, Nanjing, China

    Ling Chen

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  1. Xin Zhang
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  2. Yucheng Lei
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  3. Ling Chen
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  4. Fei Huang
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  5. Qiang Zhu
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Correspondence to Yucheng Lei.

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Zhang, X., Lei, Y., Chen, L. et al. Study on Creep Properties for TIG Welded Joints of CLAM Steel. J Fusion Energ 35, 299–304 (2016). https://doi.org/10.1007/s10894-015-0024-3

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  • DOI: https://doi.org/10.1007/s10894-015-0024-3

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