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Investigation on mechanism of type IV cracking in P92 steel at 650 °C

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Abstract

Welded joints of P92 steel subjected to creep testing at 650 °C and 70 MPa were investigated. Type IV cracking was observed in the fine-grained heat-affected zone (FGHAZ) of the welded joints by optical microscopy. It was found that with varying creep times, the number of creep voids increased at an accelerating rate and the maximum number of voids was formed in the FGHAZ. Scanning electron microscopy observations revealed that precipitates were formed in the interior of creep voids, suggesting that the nucleation of the creep voids is related to the precipitates. These creep voids then connected with each other, isolated the grain from the matrix, and formed zigzag microcracks, leading to type IV cracking. New coarse carbides—the Laves phase and Cr7C3—were precipitated during creep. These carbides can deteriorate the creep strength and stimulate the nucleation of creep voids in the FGHAZ.

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Acknowledgments

The research work of this paper is supported by the National Nature Science Foundation of China (Contract No. 50805103), Tianjin Nature Science Foundation of China (Contract No. 08JCZDJC18100) and (Contract No. 08JCYBJC09100), the New Teacher Project in Specialized Research Fund for the Doctoral Program of Higher Education of China (Contract No. 20070056096), and Scientific Research Institute Technical Development Special Fund Project of the Ministry of Science and Technology of China (Ncste-2006-Jkzx-178).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China

    Lei Zhao, Hongyang Jing, Lianyong Xu, Junchao An & Guangchun Xiao

  2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, 300072, China

    Lei Zhao, Hongyang Jing, Lianyong Xu, Junchao An & Guangchun Xiao

  3. China Electric Power Research Institute, Beijing, 100055, China

    Delu Xu, Yucheng Chen & Yu Han

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  1. Lei Zhao
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  2. Hongyang Jing
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Correspondence to Lianyong Xu.

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Zhao, L., Jing, H., Xu, L. et al. Investigation on mechanism of type IV cracking in P92 steel at 650 °C. Journal of Materials Research 26, 934–943 (2011). https://doi.org/10.1557/jmr.2011.11

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