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MA Chong, JING Hongyang, XU Lianyong, XU Delu, CHEN Yucheng. Microstructure investigation on Type Ⅳ cracking in P92 steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (8): 49-52.
Citation: MA Chong, JING Hongyang, XU Lianyong, XU Delu, CHEN Yucheng. Microstructure investigation on Type Ⅳ cracking in P92 steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (8): 49-52.
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Microstructure investigation on Type Ⅳ cracking in P92 steel

  • 1.

    School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072, China

  • 2.

    China Electric Power Research Institute, Beijing 100192, China

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  • Received Date: March 22, 2009
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  • The microstructures and hardness distribution of P92 welded joint was analyzed, and the creep damages of the joints were observed under various times of creep tests at 650℃ and 70 MPa.It was found that no obvious creep damage was observed in the all zones of P92 welded joints for the 3 000 h creep specimen, many creep voids occurred in fine grain heat-affected zone and intercritical heat-affected zone regions and no creep voids were found in the coarse fine heat-affected zone and the weld metal in 4 032 h creep specimen, the voids grew up and tend to coalesce in 7 000 h specimen, and micro fissures began to form in 7 026 h specimen.Therefore, this creep fracture could be clearly identified as Type IV cracking.
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