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ZHANG Bojun, YU Huajin, JING Hongyang, XU Lianyong, ZHAO Lei. Study on creep properties of deposited weld metal in nuclear class 316H pipe[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(12): 97-101. DOI: 10.12073/j.hjxb.2019400320
Citation: ZHANG Bojun, YU Huajin, JING Hongyang, XU Lianyong, ZHAO Lei. Study on creep properties of deposited weld metal in nuclear class 316H pipe[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(12): 97-101. DOI: 10.12073/j.hjxb.2019400320
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Study on creep properties of deposited weld metal in nuclear class 316H pipe

  • 1.

    Tianjin University, Tianjin 300072, China;Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072, China

  • 2.

    China Institute of Atomic Energy, Tianjin 300072, China

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  • Received Date: April 03, 2019
    Graphical Abstract
    • Abstract
  • Microstructure evolution, creep damage and fracture mechanism of deposited weld metal in muclear class 316H Pipe were studied based on uniaxial creep tests at 525℃ under various stress. The results showed that creep curves consist of three typical stages, including:transient stage, steady-creep stage and accelerated creep regime. Power-law creep dominates the creep deformation behavior of the deposited weld metal. After creep, three types of precipitates can be observed in fractured samples. The Laves phase is considered as the main strengthening phase, which precipitated inside the δ ferrite; the σ phase and the chain-like M23C6 precipitated around the interface between the δ ferrite and the austenite, facilitating the formation and growth of cavities, which caused the failure for the weld metals. Uniform equiaxed dimples are found in fracture surfaces, indicating that the ductile fracture mechanism occurs in deposited weld metal after creep rupture.
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    • References (10)
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