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LIU Chunjiao1, QIAN Bin1, CHEN Xuedong1, CHEN Tao1, CHEN Wenhong2. Effect of microalloying elements on the microstructural evolution and mechanical properties of weld joints of centrifugally cast furnace tubes[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(9): 76-82. DOI: 10.12073/j.hjxb.2018390228
Citation: LIU Chunjiao1, QIAN Bin1, CHEN Xuedong1, CHEN Tao1, CHEN Wenhong2. Effect of microalloying elements on the microstructural evolution and mechanical properties of weld joints of centrifugally cast furnace tubes[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(9): 76-82. DOI: 10.12073/j.hjxb.2018390228
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Effect of microalloying elements on the microstructural evolution and mechanical properties of weld joints of centrifugally cast furnace tubes

  • 1. Hefei General Machinery Research Institute Co., ltd., National Engineering & Technical Research Center on Pressure Vessels and Piping Safety, Sinopec Inspection and Assessment Center on Furnace Tube, No. 888 West Changjiang Road, Hefei, Anhui, P. R. China, 230031;
    2. SINOPEC Maoming Company, Maoming 525000, China

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  • Received Date: April 16, 2017
    Graphical Abstract
    • Abstract
  • Microstructural evolution and mechanical properties of weld joints of centrifugally cast furnace tubes with different contents of Ti and W are investigated via field emission scanning electron microscopy (FESEM) equipped with energy-dispersive X-ray spectroscopy, tensile testing machine and creep testing machine. The results show that high temperature performance of weld joints of 25Cr35NiNb+MA (micro alloy) and 35Cr45NiNb+MA furnace tube with addition of Ti and W is significantly higher than that of the weld joints without Ti and W. Micro alloying element Ti significantly affects the microstructures of weld joints. The microstructure of the original welded joints with high Ti content is NbTiC, and it partially transformed to G phase (Ni16Nb6Si7) during aging, which has poor creep resistance. Both NbTiC and NbC are present in the original welded joints with low Ti content, which totally transformed to G phase after high temperature aging. Micro alloying element W could improve high temperature performance of weld joints by solid solution strengthening.
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    • References (14)
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